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Journal of Physics. Condensed Matter: An Institute of Physics Journal

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https://www.readbyqxmd.com/read/27911887/probing-the-spiral-magnetic-phase-in-6%C3%A2-nm-textured-erbium-using-polarised-neutron-reflectometry
#1
N Satchell, J D S Witt, G Burnell, P J Curran, C J Kinane, T R Charlton, S Langridge, J F K Cooper
We characterise the magnetic state of highly-textured, sputter deposited erbium for a film of thickness 6 nm. Using polarised neutron reflectometry it is found that the film has a high degree of magnetic disorder, and we present some evidence that the film's local magnetic state is consistent with bulk-like spiral magnetism. This, combined with complementary characterisation techniques, show that thin film erbium is a strong candidate material for incorporation into device structures.
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911886/high-temperature-magnetism-and-microstructure-of-ferromagnetic-alloy-si1-x-mn-x
#2
B A Aronzon, A B Davydov, A L Vasiliev, N S Perov, O A Novodvorsky, L S Parshina, M Yu Presniakov, E Lahderanta
The results of a detailed study of magnetic properties and of the microstructure of SiMn films with a small deviation from stoichiometry are presented. The aim was to reveal the origin of the high temperature ferromagnetic ordering in such compounds. Unlike SiMn single crystals with the Curie temperature ~30 K, considered Si1-x Mn x compounds with x  =  0.5  +Δx and Δx in the range of 0.01-0.02 demonstrate a ferromagnetic state above room temperature. Such a ferromagnetic state can be explained by the existence of highly defective B20 SiMn nanocrystallites...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911885/ambient-pressure-photoelectron-spectroscopy-practical-considerations-and-experimental-frontiers
#3
Lena Trotochaud, Ashley R Head, Osman Karslıoğlu, Line Kyhl, Hendrik Bluhm
Over the past several decades, ambient pressure x-ray photoelectron spectroscopy (APXPS) has emerged as a powerful technique for in situ and operando investigations of chemical reactions under relevant ambient atmospheres far from ultra-high vacuum conditions. This review focuses on exemplary cases of APXPS experiments, giving special consideration to experimental techniques, challenges, and limitations specific to distinct condensed matter interfaces. We discuss APXPS experiments on solid/vapor interfaces, including the special case of 2D films of graphene and hexagonal boron nitride on metal substrates with intercalated gas molecules, liquid/vapor interfaces, and liquid/solid interfaces, which are a relatively new class of interfaces being probed by APXPS...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911884/desorption-of-water-from-hydrophilic-mcm-41-mesopores-positron-annihilation-ftir-and-md-simulation-studies
#4
Priya Maheshwari, D Dutta, T Muthulakshmi, B Chakraborty, N Raje, P K Pujari
The desorption mechanism of water from the hydrophilic mesopores of MCM-41 was studied using positron annihilation lifetime spectroscopy (PALS) and attenuated total reflection Fourier transform infrared spectroscopy supplemented with molecular dynamics (MD) simulation. PALS results indicated that water molecules do not undergo sequential evaporation in a simple layer-by-layer manner during desorption from MCM-41 mesopores. The results suggested that the water column inside the uniform cylindrical mesopore become stretched during desorption and induces cavitation (as seen in the case of ink-bottle type pores) inside it, keeping a dense water layer at the hydrophilic pore wall, as well as a water plug at both the open ends of the cylindrical pore, until the water was reduced to a certain volume fraction where the pore catastrophically empties...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911883/unravelling-the-interplay-of-geometrical-magnetic-and-electronic-properties-of-metal-doped-graphene-nanomeshes
#5
Mohamed M Fadlallah, Ahmed A Maarouf, Udo Schwingenschlögl, Ulrich Eckern
Graphene nanomeshes (GNMs), formed by creating a superlattice of pores in graphene, possess rich physical and chemical properties. Many of these properties are determined by the pore geometry. In this work, we use first principles calculations to study the magnetic and electronic properties of metal-doped nitrogen-passivated GNMs. We find that the magnetic behaviour is dependent on the pore shape (trigonal versus hexagonal) as dictated by the number of covalent bonds formed between the 3d metal and the passivating N atoms...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911882/a-unified-perspective-of-complex-band-structure-interpretations-formulations-and-applications
#6
Matthew G Reuter
Complex band structure generalizes conventional band structure by also considering wavevectors with complex components. In this way, complex band structure describes both the bulk-propagating states from conventional band structure and the evanescent states that grow or decay from one unit cell to the next. Even though these latter states are excluded by translational symmetry, they become important when translational symmetry is broken via, for example, a surface or impurity. Many studies over the last 80 years have directly or indirectly developed complex band structure for an impressive range of applications, but very few discuss its fundamentals or compare its various results...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911881/low-energy-ne-ion-beam-induced-modifications-of-magnetic-properties-in-mnas-thin-films
#7
M Trassinelli, L Bernard Carlsson, S Cervera, M Eddrief, V H Etgens, E V Gafton, E Lacaze, E Lamour, A Lévy, S Macé, C Prigent, J-P Rozet, S Steydli, M Marangolo, D Vernhet
Investigations of the complex behavior of the magnetization of manganese arsenide thin films due to defects induced by irradiation of slow heavy ions are presented. In addition to the thermal hysteresis suppression already highlighted in Trassinelli et al (2014 Appl. Phys. Lett. 104 081906), we report here on new local magnetic features recorded by a magnetic force microscope at different temperatures close to the characteristic sample phase transition. Complementary measurements of the global magnetization in different conditions (applied magnetic field and temperatures) enable the film characterization to be completed...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911880/study-of-the-sign-change-of-exchange-bias-across-the-spin-reorientation-transition-in-co-cr1-x-fe-x-2o4-x%C3%A2-%C3%A2-%C3%A2-%C3%A2-0-00-0-125
#8
R Padam, Swati Pandya, S Ravi, S Ramakrishnan, A K Nigam, A K Grover, D Pal
We present the evolution of novel phenomena of magnetic compensation effect, exchange bias (EB) effect and the field induced anomalies in '[Formula: see text]' substituted multiferroic compound [Formula: see text]. A few percent of '[Formula: see text]' substitution for '[Formula: see text]' in [Formula: see text] results in the reversal of field cooled magnetization under low applied fields below compensation temperature T comp. Further, increase in the field leads to the spin reorientation transition (T SR)...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27911879/interface-electronic-structure-at-the-topological-insulator-ferrimagnetic-insulator-junction
#9
Y Kubota, K Murata, J Miyawaki, K Ozawa, M C Onbasli, T Shirasawa, B Feng, Sh Yamamoto, R-Y Liu, S Yamamoto, S K Mahatha, P Sheverdyaeva, P Moras, C A Ross, S Suga, Y Harada, K L Wang, I Matsuda
An interface electron state at the junction between a three-dimensional topological insulator film, Bi2Se3, and a ferrimagnetic insulator film, Y3Fe5O12 (YIG), was investigated by measurements of angle-resolved photoelectron spectroscopy and x-ray absorption magnetic circular dichroism. The surface state of the Bi2Se3 film was directly observed and localized 3d spin states of the Fe(3+) in the YIG film were confirmed. The proximity effect is likely described in terms of the exchange interaction between the localized Fe 3d electrons in the YIG film and delocalized electrons of the surface and bulk states in the Bi2Se3 film...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869646/magnetoelectric-effects-in-the-spiral-magnets-cucl2-and-cubr2
#10
P Tolédano, A P Ayala, A F G Furtado Filho, J P C do Nascimento, M A S Silva, A S B Sombra
The nature and symmetry of transition mechanisms in the spin-spiral copper halides CuCl2 and CuBr2 are analyzed theoretically. The magnetoelectric effects observed in the two multiferroic compounds are described and their phase diagram at zero and applied magnetic fields are worked out. The emergence of the electric polarization at zero field below the paramagnetic phase is shown to result from the coupling of two distinct spin-density waves and to be only partly related to the Dzialoshinskii-Moriya interactions...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869645/size-effect-on-high-temperature-variable-range-hopping-in-al-implanted-4h-sic
#11
Antonella Parisini, Andrea Parisini, Roberta Nipoti
The hole transport properties of heavily doped 4H-SiC (Al) layers with Al implanted concentrations of 3  ×  10(20) and 5  ×  10(20) cm(-3) and annealed in the temperature range 1950-2100 °C, have been analyzed to determine the main transport mechanisms. This study shows that the temperature dependence of the resistivity (conductivity) may be accounted for by a variable range hopping (VRH) transport into an impurity band. Depending on the concentration of the implanted impurities and the post-implantation annealing treatment, this VRH mechanism persists over different temperature ranges that may extend up to room temperature...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869643/first-principles-calculations-of-momentum-distributions-of-annihilating-electron-positron-pairs-in-defects-in-uo2
#12
Julia Wiktor, Gérald Jomard, Marc Torrent, Marjorie Bertolus
We performed first-principles calculations of the momentum distributions of annihilating electron-positron pairs in vacancies in uranium dioxide. Full atomic relaxation effects (due to both electronic and positronic forces) were taken into account and self-consistent two-component density functional theory schemes were used. We present one-dimensional momentum distributions (Doppler-broadened annihilation radiation line shapes) along with line-shape parameters S and W. We studied the effect of the charge state of the defect on the Doppler spectra...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869641/orbital-breathing-effects-in-the-computation-of-x-ray-d-ion-spectra-in-solids-by-ab-initio-wave-function-based-methods
#13
Nikolay A Bogdanov, Valentina Bisogni, Roberto Kraus, Claude Monney, Kejin Zhou, Thorsten Schmitt, Jochen Geck, Alexander O Mitrushchenkov, Hermann Stoll, Jeroen van den Brink, Liviu Hozoi
In existing theoretical approaches to core-level excitations of transition-metal ions in solids relaxation and polarization effects due to the inner core hole are often ignored or described phenomenologically. Here we set up an ab initio computational scheme that explicitly accounts for such physics in the calculation of x-ray absorption and resonant inelastic x-ray scattering spectra. Good agreement is found with experimental transition-metal L-edge data for the strongly correlated d (9) cuprate Li2CuO2, for which we determine the absolute scattering intensities...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869639/thermal-response-in-van-der-waals-heterostructures
#14
Appala Naidu Gandi, Husam N Alshareef, Udo Schwingenschlögl
We solve numerically the Boltzmann transport equations of the phonons and electrons to understand the thermoelectric response in heterostructures of M2CO2 (M: Ti, Zr, Hf) MXenes with transition metal dichalcogenide monolayers. Low frequency optical phonons are found to occur as a consequence of the van der Waals bonding, contribute significantly to the thermal transport, and compensate for the reduced contributions of the acoustic phonons (increased scattering cross-sections in heterostructures), such that the thermal conductivities turn out to be similar to those of the bare MXenes...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869638/a-realistic-quantum-capacitance-model-for-quantum-hall-edge-state-based-fabry-p%C3%A3-rot-interferometers
#15
O Kilicoglu, D Eksi, A Siddiki
In this work, the classical and the quantum capacitances are calculated for a Fabry-Pérot interferometer operating in the integer quantized Hall regime. We first consider a rotationally symmetric electrostatic confinement potential and obtain the widths and the spatial distribution of the insulating (incompressible) circular strips using a charge density profile stemming from self-consistent calculations. Modelling the electrical circuit of capacitors composed of metallic gates and incompressible/compressible strips, we investigate the conditions to observe Aharonov-Bohm (quantum mechanical phase dependent) and Coulomb blockade (capacitive coupling dependent) effects reflected in conductance oscillations...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869637/the-lattice-stiffening-transition-in-uo2-single-crystals
#16
Christopher Young, James Petrosky, J Matthew Mann, Eric M Hunt, David Turner, Peter A Dowben
The effective Debye temperatures ([Formula: see text]) of the surface region of UO2 single crystals, prepared by the hydrothermal synthesis technique, were obtained from temperature-dependent x-ray photoemission in the temperature range of 300 K-623 K. A lattice stiffening transition, characterized by different regions of different effective Debye temperature, 500  ±  59 K below 475 K and 165  ±  21 K above 475 K is identified. A comparison of the temperature dependence of the effective UO2 Debye temperature, with the changes in the lattice expansion coefficient for UO2, support strong lattice-phonon interaction arising from the Jahn-Teller distortion...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27869636/insignificant-influence-of-the-matrix-on-the-melting-of-incoherently-embedded-tin-and-zinc-nanoparticles
#17
L M Shen, H F Hou, C Y Yao, L W Wang
For studying the melting point depression of metals, isolated metallic nanoparticles embedded in a matrix are usually prepared by mechanical milling. Al is the main available matrix material. In this work, to explore possible alternative matrices for further investigation of melting, mechanically milled metal-nonmetal systems are developed, namely Sn-LiF, Zn-LiF and Zn-Al2O3. The outcome indicates that different matrices do not have a significantly different influence on the melting of Sn and Zn. Theoretical analyses of both the thermodynamics and kinetics of surface-induced melting may support this experimental finding...
November 21, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27849630/the-role-of-the-alkali-and-chalcogen-atoms-on-the-stability-of-the-layered-chalcogenide-formula-see-text-a%C3%A2-%C3%A2-%C3%A2-%C3%A2-alkali-metal-m%C3%A2-%C3%A2-%C3%A2-%C3%A2-metal-cations-q%C3%A2-%C3%A2-%C3%A2-%C3%A2-chalcogen-compounds-a-density-functional-theory-investigation-within-van-der-waals-corrections
#18
Rafael Besse, Juarez L F Da Silva
There is a great interest to design two-dimensional (2D) chalcogenide materials, however, our atomistic understanding of the major physical parameters that drive the formation of 2D or three-dimensional (3D) chalcogenides is far from satisfactory, in particular, for complex quaternary systems. To address this problem, we selected a set of quaternary 2D and 3D chalcogenide compounds, namely, [Formula: see text] (A  =  Li, K, Cs; Q  =  S, Se, Te), which were investigated by density functional theory calculations within van der Waals (vdW) corrections...
November 16, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27849629/magnetic-properties-of-rare-earth-doped-la0-7sr0-3mno3
#19
Pavel Veverka, Ondřej Kaman, Karel Knížek, Pavel Novák, Miroslav Maryško, Zdeněk Jirák
Rare-earth-doped ferromagnetic manganites La0.63RE0.07Sr0.30MnO3 (RE  =  Gd, Tb, Dy, and Ho) are synthesized in the form of sintered ceramics and nanocrystalline phases with the mean size of crystallites  ≈30 nm. The electronic states of the dopants are investigated by SQUID magnetometry and theoretically interpreted based on the calculations of the crystal field splitting of rare-earth energy levels. The samples show the orthorhombic perovskite structure of Ibmm symmetry, with a complete FM order of Mn spins in bulk and reduced order in nanoparticles...
November 16, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27849628/phase-diagrams-of-vortex-matter-with-multi-scale-inter-vortex-interactions-in-layered-superconductors
#20
Qingyou Meng, Christopher N Varney, Hans Fangohr, Egor Babaev
It was recently proposed to use the stray magnetic fields of superconducting vortex lattices to trap ultracold atoms for building quantum emulators. This calls for new methods for engineering and manipulating of the vortex states. One of the possible routes utilizes type-1.5 superconducting layered systems with multi-scale inter-vortex interactions. In order to explore the possible vortex states that can be engineered, we present two phase diagrams of phenomenological vortex matter models with multi-scale inter-vortex interactions featuring several attractive and repulsive length scales...
November 16, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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