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

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https://www.readbyqxmd.com/read/29140800/glassy-magnetic-ground-state-and-kondo-like-behaviour-in-mn10fege8-alloy
#1
S Pramanick, P Dutta, S Majumdar, S Chatterjee
We report a detailed investigation of the ground-state magnetic properties of newly synthesized [Formula: see text] [Formula: see text] alloy. The sample can be thought of being derived by substituting one Mn atom by Fe of the parent compound [Formula: see text] [Formula: see text]. Fe-substitution leads to a drastic change in the magnetic ground state as well as to the magneto-transport properties of the parent alloy. On cooling below 250 K, [Formula: see text] [Formula: see text] undergoes a transition from paramagnetic phase to a state having significant ferromagnetic correlations...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29140796/temperature-and-impurity-effect-on-parallel-field-magnetoconductance-of-bulk-insulating-topological-insulator-bi1-x-sb-x-2te3
#2
R R Urkude, R Rawat, U A Palikundwar
We have performed a systematic parallel field magnetotransport studies of (Bi1-x Sb x )2Te3 to understand the temperature and impurity effect on the interference of bulk conductance on the surface states of highly insulating topologically insulating compound Bi2Te3. The compound exhibits a weak antilocalization effect (WAL) at low temperature and low magnetic field. WAL weakens and a weak localization effect is observed to be developed in the compound with the increase in temperature due to the creation of topologically trivial 2D electron gas states...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29140254/semiconductor-of-spinons-from-ising-band-insulator-to-orthogonal-band-insulator
#3
Tohid Farajollahpour, Seyed Akbar Jafari
We use ionic Hubbard model to study the effects of strong correlations on a two-dimensional semiconductor. The spectral gap in the limit where on-site interactions are zero is set by the staggered ionic potential, while in the strong interaction limit it is set by the Hubbard U. Combining mean field solutions of the slave spin and slave rotor methods we propose two interesting gapped phases in between: (i) The insulating phase before the Mott phase can be viewed as gapping a non-Fermi liquid state of spinons by the staggered ionic potential...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29140253/electrical-resistivity-and-wave-character-of-free-electrons-in-amorphous-and-nanoglass-sc-sub-75-sub-fe-sub-25-sub
#4
Mohammad Ghafari, Wayne D Hutchison, Stewart J Campbell, Herbert Gleiter, Horst Hahn, Tao Feng
The residual electrical resistivity of metallic amorphous alloys, ρ0, is typically in the range 50 μΩ cm < ρ0 < 310 μΩ cm corresponding to a mean free path of conduction electrons of order a few interatomic distances. In crystalline metals with low defect levels such as Cu however, the residual electrical resistivity is about ρ0 ≈ 1.54 x 10-2 μΩ cm, leading to extensive progression of free electrons through the crystalline material, of typically up to 4 x 106 nm. The relatively "high" values for the electrical resistivity of distorted Sc75Fe25 alloys are discussed here within the framework of the wave character of electrons...
November 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29135472/crystal-growth-and-transport-properties-of-weyl-semimetal-taas
#5
Raman Sankar, Peramaiyan G, Panneer Muthuselvam Irulandi, Suyang Xu, M Zahid Hasan, Fang-Cheng Chou
We report single crystal growth and transport properties of a Weyl semimetal TaAs. Unsaturated large MR about 22100 % at 2 K and 9 T is observed. From the Hall measurement, carrier concentrations n = 4.608×1024 m-3 and p = 3.099×1024 m-3, and mobilities μp = 2.502 m2 V-1 s-1 and μn = 16.785 m2 V-1 s-1 at 2 K are extracted. The de Haas-van Alphen (dHvA) oscillations at 2 K and 9 T suggest the presence of a Fermi surface, and the quantum electronic parameters such as effective cyclotron mass and Dingle temperature were obtained using Lifshitz-Kosevich (L-K) fitting...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29135470/planar-screening-by-charge-polydisperse-counterions
#6
Martin Trulsson, Emmanuel Trizac, Ladislav Samaj
We study how a neutralising cloud of counterions screens the electric field of a uniformly charged planar membrane (plate), when the counterions are characterised by a distribution of charges (or valence), n(q). We work out analytically the one-plate and two-plate cases, at the level of non-linear Poisson-Boltzmann theory. The (essentially asymptotic) predictions are successfully compared to numerical solutions of the full Poisson-Boltzmann theory, but also to Monte Carlo simulations...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29135466/all-spinel-oxide-josephson-junctions-for-high-efficiency-spin-filtering
#7
Salvatore Mesoraca, Simon Knudde, Diana C Leitao, Susana Cardoso, Mark G Blamire
Obtaining high efficiency spin-filtering at room temperature using spinel ferromagnetic tunnel barriers has been hampered by the formation of antiphase boundaries (APBs) due to their difference in lattice parameter between barrier and electrodes. In this work, we demonstrate the use of LiTi2O4 thin films as electrodes in an all-spinel oxide CoFe2O4-based spin filter devices. These structures show nearly perfect epitaxy maintained throughout the structure and so minimise the potential for APB formation. The LiTi2O4 in these devices is superconducting and so measurements at low temperature have been used to explore details of the tunnelling and Josephson junction behaviour...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29135461/site-occupancy-composition-and-magnetic-structure-dependencies-of-martensitic-transformation-in-mn-sub-2-sub-ni-sub-1-x-sub-sn-sub-1-x-sub
#8
Ashis Kundu, Subhradip Ghosh
A delicate balance between various factors such as site occupancy, composition and magnetic ordering seems to affect the stability of the martensitic phase in Mn<sub>2</sub>Ni<sub>1+x</sub>Sn<sub>1-x</sub>. Using first-principles DFT calculations, we explore the impacts of each one of these factors on the martensitic stability of this system. Our results on total energies, magnetic moments and electronic structures upon changes in the composition, the magnetic configurations and the site occupancies show that the occupancies at the 4d sites in the Inverse Heusler crystal structure play the most crucial role...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29134950/structural-magnetic-and-electronic-properties-of-pulsed-laser-deposition-grown-srfeo3-%C3%AE-thin-films-and-srfeo3-%C3%AE-la2-3ca1-3mno3-multilayers
#9
E Perret, K Sen, J Khmaladze, B P P Mallett, M Yazdi-Rizi, P Marsik, S Das, I Marozau, M A Uribe-Laverde, R de Andrés Prada, J Strempfer, M Döbeli, N Biškup, M Varela, Y-L Mathis, C Bernhard
We studied the structural, magnetic and electronic properties of [Formula: see text] (SFO) thin films and [Formula: see text]/[Formula: see text] [Formula: see text]MnO3 (LCMO) superlattices that have been grown with pulsed laser deposition (PLD) on [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] (LSAT) substrates. X-ray reflectometry and scanning transmission electron microscopy (STEM) confirm the high structural quality of the films and flat and atomically sharp interfaces of the superlattices...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29134946/prediction-of-phonon-mediated-superconductivity-in-hole-doped-black-phosphorus
#10
Yanqing Feng, Hong Xi Sun, Junhui Sun, Zhibin Lu, Yong You
We study the conventional electron--phonon mediated superconducting properties of hole-doped Black Phosphorus by density functional calculations and get a quite large electron--phonon coupling (EPC) constant λ ~ 1.0 with transition temperature TC ~ 10 K, which is comparable to MgB2 when holes are doped into degenerate and nearly flat energy bands around the Fermi level. We predict that the softening of low-frequency B3g1 optical mode and its phonon displacement which breaks the lattice nonsymmorphic symmetry of gliding plane and lifts the band double degeneracy, lead to a large EPC...
November 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130900/aggregate-frequency-width-nuclear-hyperfine-coupling-and-jahn-teller-effect-of-i-cu-sub-2-sub-i-impurity-ion-esr-in-i-srlaalo-sub-4-sub-i-dielectric-resonator-at-i-20-i-millikelvin
#11
Md Akhter Hosain, Jean Michel Le Floch, Jerzy Krupka, Michael E Tobar
The impurity paramagnetic ion, Cu2+ substitutes Al in the SrLaAlO4 single crystal lattice, this results in a CuO6 elongated octahedron, and the resulting measured g-factors satisfy four-fold axes variation condition. The aggregate frequency width of the electron spin resonance with the required minimum level of impurity concentration has been evaluated in single crystal SrLaAlO4 at 20 millikelvin. Measured parallel hyperfine constants, A∥Cu, were determined to be -155.7 × 10-4 cm-1, - 163...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130891/nonlinear-modeling-of-crystal-system-transition-of-black-phosphorus-using-continuum-dft-model
#12
AliReza Setoodeh, Hamed Farahmand
In this paper, nonlinear behavior of black phosphorus crystals is investigated in tandem with dispersion corrected density functional theory (DFT-D) analysis under uniaxial loading. According to the distinguished anisotropic behavior of black phosphorus due to its morphological anisotropy, a hyperelastic anisotropic (HA) model named continuum-DFT is established to predict nonlinear behavior of the material. In this respect, uniaxial tensile Cauchy stresses are employed on both the DFT-D and HA models along zig-zag direction...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130889/electron-trap-states-at-ingaas-oxide-interfaces-under-inversion-through-constant-fermi-level-i-ab-initio-i-molecular-dynamics
#13
Assil Bouzid, Alfredo Pasquarello
We employ constant-Fermi-level ab initio molecular dynamics to investigate defects at the InGaAs/oxide interface upon inversion. We adopt a substoichiometric amorphous model for modelling the structure at the interface and investigate the formation of defect structures upon setting the Fermi-level above the conduction band minimum. The defect formation is detected through both an analysis of the atomic structure and a Wannier decomposition of the electronic structure. This computer driven approach is able to retrieve In and Ga lone-pair defects and As-As dimer/dangling bond defects, in agreement with previous studies based on physical intuition...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130456/strain-coupling-of-oxygen-non-stoichiometry-in-perovskite-thin-films
#14
Andreas Herklotz, Dongkyu Lee, Er-Jia Guo, Tricia L Meyer, Jonathan R Petrie, Ho Nyung Lee
The effects of strain and oxygen vacancies on perovskite thin films have been studied in great detail over the past decades and have been treated separately from each other. While epitaxial strain has been realized as a tuning knob to tailor the functional properties of correlated oxides, oxygen vacancies are usually regarded as undesirable and detrimental. In transition metal oxides, oxygen defects strongly modify the properties and functionalities via changes in oxidation states of the transition metals. However, such coupling is not well understood in epitaxial films, but rather deemed as cumbersome or experimental artifact...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130455/structure-magnetism-and-electronic-properties-in-3d-5d-based-double-perovskite-formula-see-text-y-x-2feiro6
#15
K C Kharkwal, A K Pramanik
The 3d-5d based double perovskites are of current interest as they provide model systems to study the interplay between electronic correlation (U) and spin-orbit coupling (SOC). Here, we report detailed structural, magnetic and transport properties of doped double perovskite material ([Formula: see text]Y x )2FeIrO6 with [Formula: see text]. With substitution of Y, the system retains its original crystal structure but structural parameters change with x in nonmonotonic fashion. The magnetization data for Sr2FeIrO6 show antiferromagnetic type magnetic transition around 45 K; however, a close inspection of the data indicates a weak magnetic phase transition around 120 K...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29130454/recent-trends-in-spin-resolved-photoelectron-spectroscopy
#16
Taichi Okuda
Since the discovery of the Rashba effect on crystal surfaces and also the discovery of topological insulators, spin- and angle-resolved photoelectron spectroscopy (SARPES) has become more and more important, as the technique can measure directly the electronic band structure of materials with spin resolution. In the same way that the discovery of high-Tc superconductors promoted the development of high-resolution angle-resolved photoelectron spectroscopy, the discovery of this new class of materials has stimulated the development of new SARPES apparatus with new functions and higher resolution, such as spin vector analysis, ten times higher energy and angular resolution than conventional SARPES, multichannel spin detection, and so on...
November 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29125475/control-of-active-turbulence-through-addressable-soft-interfaces
#17
Pau Guillamat, Jérôme Hardoüin, Berta M Prat, Jordi Ignés, Francesc Sagues
We present an experimental study of a kinesin/tubulin active nematic formed at different oil interfaces. By tuning the interfacial rheology of the contacting oil, we have been able to condition and control the seemingly chaotic motion that characterizes the self-sustained active flows in our preparations. The active nematic is inherently unstable and spontaneously develops defects from an initial homogeneous state. We show that the steady state and, in particular, the density and dynamics of the defects strongly depends on the rheology of the contacting oil...
November 10, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29125474/indirect-k-edge-bimagnon-resonant-inelastic-x-ray-scattering-spectrum-of-%C3%AE-fete
#18
Zengye Huang, Sean Mongan, Trinanjan Datta, Daoxin Yao
We calculate the K-edge indirect bimagnon resonant inelastic X-ray scattering (RIXS) intensity spectra of the bicollinear antiferromagnetic order known to occur in the α-FeTe chalcogenide system. Utilizing linear spin wave theory for this large-S spin system we find that the bimagnon spectrum contains four scattering channels (two intraband and two interband). We find from our calculations that for suitable energy-momentum combination the RIXS spectra can exhibit a one-, two- or three- peak structure. The number of peaks provides a clue on the various bimagnon excitation processes that can be supported both in and within the acoustic and optical magnon branches of the bicollinear antiferromagnet...
November 10, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29125472/membrane-vesiculation-induced-by-proteins-of-the-dengue-virus-envelope-studied-by-molecular-dynamics-simulations
#19
Ricardo de Oliveira Dos Santos Soares, Leandro Oliveira Bortot, David van der Spoel, Antonio Caliri
Biological membranes are continuously remodeled in the cell by specific membrane-shaping machineries to form, for example, tubes and vesicles. We examine fundamental mechanisms involved in the vesiculation processes induced by a cluster of envelope (E) and membrane (M) proteins of the Dengue Virus (DENV) using molecular dynamics simulations and a coarse-grained model. We show that an arrangement of three E-M heterotetramers (EM3) works as a bending unit and an ordered cluster of five such units generates a closed vesicle, reminiscent of the virus budding process...
November 10, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29125470/magnetic-behavior-of-metastable-fe-films-grown-on-ir-111
#20
Alberto Calloni, Matteo Cozzi, Madan Sangarashettyhalli Jagadeesh, Gianlorenzo Bussetti, Franco Ciccacci, Lamberto Duo
We investigated the growth of ultra-thin Fe films on Ir(111) by means of <i>in-situ</i> low energy electron diffraction and spin-resolved photoemission techniques. We observe a (1x1) diffraction pattern, characteristic of the <i>fcc</i> substrate, below 4 monolayers (ML). Then, a complex superstructure starts to develop, compatible with the formation of <i>bcc</i>-like Fe domains aligned with the substrate according to the Kourdjumov-Sachs orientation relationships. The analysis of the diffraction patterns reveals a progressive evolution towards a fully relaxed <i>bcc</i> lattice, characteristic of bulk Fe...
November 10, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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