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quantum magnetic analyser

Keshav Shrestha, Vera Marinova, Bernd Lorenz, Paul C W Chu
We present a systematic quantum oscillations study on a metallic, <i>p</i>-type Bi<sub>2</sub>Te<sub>3</sub> topological single crystal in magnetic fields up to <i>B</i> = 7 T. The maxima/minima positions of oscillations measured at different tilt angles align to one another when plotted as a function of the normal component of magnetic field, confirming the presence of the 2D Fermi surface. Additionally, the Berry phase, β = 0...
March 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
D G Costa, Rodrigo B Capaz, R Falconi, S Strikos, M ElMassalami
According to an earlier Abrikosov model, a positive, nonsaturating, linear magnetoresistivity (LMR) is expected in clean, low-carrier-density metals when measured at very low temperatures and under very high magnetic fields. Recently, a vast class of materials were shown to exhibit extraordinary high LMR but at conditions that deviate sharply from the above-mentioned Abrikosov-type conditions. Such deviations are often considered within either classical Parish-Littlewood scenario of random-conductivity network or within a quantum scenario of small-effective mass or low carriers at tiny pockets neighboring the Fermi surface...
March 6, 2018: Scientific Reports
Jun-Liang Liu, Yan-Cong Chen, Ming-Liang Tong
Toward promising candidates of quantum information processing, the rapid development of lanthanide-based single-molecule magnets (Ln-SMMs) highlights design strategies in consideration of the local symmetry of lanthanide ions. In this review, crystal-field theory is employed to demonstrate the electronic structures according to the semiquantitative electrostatic model. Then, specific symmetry elements are analysed for the elimination of transverse crystal fields and quantum tunnelling of magnetization (QTM)...
March 1, 2018: Chemical Society Reviews
J Oitmaa
We investigate ground state and high-temperature properties of the nearest-neighbour Heisenberg antiferromagnet on the 
 three-dimensional diamond lattice, using series expansion methods. The ground-state energy and magnetization as well as
 the magnon spectrum are calculated and found to be in good agreement with first-order spin-wave theory, with a quantum
 renormalization factor of about 1.13. High-temperature series are derived for the free energy, and physical and
 staggered susceptibilities for spin S1/2, 1 and 3/2, and analysed to obtain the corresponding Curie and Neel temperatures...
February 26, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
J Beerwerth, M Storek, D Greim, J Lueg, R Siegel, B Cetinkaya, W Hiller, H Zimmermann, J Senker, R Böhmer
Polycrystalline dimethyl sulfone is studied using central-transition oxygen-17 exchange NMR. The quadrupolar and chemical shift tensors are determined by combining quantum chemical calculations with line shape analyses of rigid-lattice spectra measured for stationary and rotating samples at several external magnetic fields. Quantum chemical computations predict that the largest principal axes of the chemical shift anisotropy and electrical field gradient tensors enclose an angle of about 73°. This prediction is successfully tested by comparison with absorption spectra recorded at three different external magnetic fields...
January 31, 2018: Journal of Magnetic Resonance
Frederik Görg, Michael Messer, Kilian Sandholzer, Gregor Jotzu, Rémi Desbuquois, Tilman Esslinger
Periodic driving can be used to control the properties of a many-body state coherently and to realize phases that are not accessible in static systems. For example, exposing materials to intense laser pulses makes it possible to induce metal-insulator transitions, to control magnetic order and to generate transient superconducting behaviour well above the static transition temperature. However, pinning down the mechanisms underlying these phenomena is often difficult because the response of a material to irradiation is governed by complex, many-body dynamics...
January 24, 2018: Nature
Vasily Lavrentiev, D Chvostova, Alexandr Stupakov, Inna Lavrentieva, J Vacik, Mykhaylo Motylenko, Mykhailo Barchuk, David Rafaja, Alexandr Dejneka
Driving by interplay between plasmonic and magnetic effects in organic composite semiconductors is a challenging task with a huge potential for practical applications. Here, we present the evidences of a quantum plasmon excited in the self-assembled CoxC60 nanocomposite films with x>15 (interval of the Co cluster coalescence) and analysed it using the optical absorption (OA) spectra. In the case of the CoxC60 film with x=16 (LF sample), the quantum plasmon generated by the Co/CoO clusters was found as the 1...
January 25, 2018: Nanotechnology
Qinqin Huang, Yin Wang, Xingxiang Chen, Yimeng Wang, Zhiqiang Li, Shiming Du, Lianrong Wang, Shi Chen
Circulating tumor cells (CTCs) are cancer cells that shed from a primary tumor and circulate in the bloodstream. As a form of "tumor liquid biopsy", CTCs provide important information for the mechanistic investigation of cancer metastasis and the measurement of tumor genotype evolution during treatment and disease progression. However, the extremely low abundance of CTCs in the peripheral blood and the heterogeneity of CTCs make their isolation and characterization major technological challenges. Recently, nanotechnologies have been developed for sensitive CTC detection; such technologies will enable better cell and molecular characterization and open up a wide range of clinical applications, including early disease detection and evaluation of treatment response and disease progression...
2018: Nanotheranostics
P Reith, X Renshaw Wang, H Hilgenkamp
Scanning superconducting quantum interference device microscopy (SSM) is a scanning probe technique that images local magnetic flux, which allows for mapping of magnetic fields with high field and spatial accuracy. Many studies involving SSM have been published in the last few decades, using SSM to make qualitative statements about magnetism. However, quantitative analysis using SSM has received less attention. In this work, we discuss several aspects of interpreting SSM images and methods to improve quantitative analysis...
December 2017: Review of Scientific Instruments
Khadijat O Abdulwahab, Mohammad A Malik, Paul O'Brien, Iñigo J Vitorica-Yrezabal, Grigore A Timco, Floriana Tuna, Richard E P Winpenny
Monodisperse cobalt chromium ferrite (FeCoCrO4 ) nanoparticles have been synthesised using the trimetallic pivalate cluster [CrCoFeO(O2 Ct Bu)6 (HO2 Ct Bu)3 ]. The precursor was thermolysed in oleylamine and oleic acid, with diphenyl ether as the solvent at 260 °C. The effect of time and the concentration of the precursor on the stoichiometry of the phase formed and/or the morphology of the nanoparticles was studied. The reaction time was investigated by withdrawing aliquots at different times. No products were formed after 5 minutes and aliquots withdrawn at reaction times of less than 1 hour contain traces of iron oxide (Fe2 O3 ); only cubic cobalt chromium ferrite (FeCoCrO4 ) was obtained after one hour...
January 2, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Lamia T Abou El-Kassem, Usama W Hawas, Samy K El-Desouky, Radwan Al-Farawati
A new pseudoguaiane-type sesquiterpene named litopharbol (1) was isolated from the methanolic extract of the Red Sea soft coral Litophyton arboreum, along with known sesquiterpenoids alismol (2), alismorientol B (3), teuhetenone A (4), and calamusin I (5); steroid, 24-methyl-cholesta-5,24(28)-diene-3β-ol (6), alkyl glyceryl ether, chimyl alcohol (7); sphingolipid, erythro-N-dodecanoyl-docosasphinga-(4E,8E)-dienine (8); and nitrogenous bases, thymine (9) and thymidine (10). The structures were determined on the basis of nuclear magnetic resonance (NMR) spectroscopic (1D and 2D NMR data including heteronuclear single quantum coherence spectroscopy, heteronuclear multiple-bond correlation spectroscopy, and nuclear Overhauser effect spectroscopy) and mass spectrometric analyses...
January 26, 2018: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
Laetitia Nivelle, Jane Hubert, Eric Courot, Nicolas Borie, Jean-Hugues Renault, Jean-Marc Nuzillard, Dominique Harakat, Christophe Clément, Laurent Martiny, Dominique Delmas, Philippe Jeandet, Michel Tarpin
A new resveratrol dimer (1) called labruscol, has been purified by centrifugal partition chromatography of a crude ethyl acetate stilbene extract obtained from elicited grapevine cell suspensions of Vitis labrusca L. cultured in a 14-liter stirred bioreactor. One dimensional (1D) and two dimensional (2D) nuclear magnetic resonance (NMR) analyses including ¹H, (13)C, heteronuclear single-quantum correlation (HSQC), heteronuclear multiple bond correlation (HMBC), and correlation spectroscopy (COSY) as well as high-resolution electrospray ionisation mass spectrometry (HR-ESI-MS) were used to characterize this compound and to unambiguously identify it as a new stilbene dimer, though its relative stereochemistry remained unsolved...
November 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Chip J Smith, Durgesh V Wagle, Hugh M O'Neill, Barbara R Evans, Sheila N Baker, Gary A Baker
To fully leverage the advantages of ionic liquids for many applications, it is necessary to immobilize or encapsulate the fluids within an inert, robust, quasi-solid-state format that does not disrupt their many desirable, inherent features. The formation of ionogels represents a promising approach; however, many earlier approaches suffer from solvent/matrix incompatibility, optical opacity, embrittlement, matrix-limited thermal stability, and/or inadequate ionic liquid loading. We offer a solution to these limitations by demonstrating a straightforward and effective strategy toward flexible and durable ionogels comprising bacterial cellulose supports hosting in excess of 99% ionic liquid by total weight...
October 23, 2017: ACS Applied Materials & Interfaces
N R Bernier, L D Tóth, A Koottandavida, M A Ioannou, D Malz, A Nunnenkamp, A K Feofanov, T J Kippenberg
Nonreciprocal microwave devices are ubiquitous in radar and radio communication and indispensable in the readout chains of superconducting quantum circuits. Since they commonly rely on ferrite materials requiring large magnetic fields that make them bulky and lossy, there has been significant interest in magnetic-field-free on-chip alternatives, such as those recently implemented using the Josephson nonlinearity. Here, we realize reconfigurable nonreciprocal transmission between two microwave modes using purely optomechanical interactions in a superconducting electromechanical circuit...
September 19, 2017: Nature Communications
Gijs van Erven, Ries de Visser, Donny W H Merkx, Willem Strolenberg, Peter de Gijsel, Harry Gruppen, Mirjam A Kabel
Understanding the mechanisms underlying plant biomass recalcitrance at the molecular level can only be achieved by accurate analyses of both the content and structural features of the molecules involved. Current quantification of lignin is, however, majorly based on unspecific gravimetric analysis after sulfuric acid hydrolysis. Hence, our research aimed at specific lignin quantification with concurrent characterization of its structural features. Hereto, for the first time, a polymeric (13)C lignin was used as internal standard (IS) for lignin quantification via analytical pyrolysis coupled to gas chromatography with mass-spectrometric detection in selected ion monitoring mode (py-GC-SIM-MS)...
October 17, 2017: Analytical Chemistry
Nobuhiro Matsumoto, Takuya Shimosaka
The purities of two high-purity organic compounds with a nitroxyl radical moiety were quantified based on their free-radical content using the effective magnetic-moment method. Magnetic moments were measured and X-band electron paramagnetic resonance (EPR) spectra were obtained using a superconducting quantum interference device and X-band EPR spectrometer, respectively, over a wide temperature range of near-room temperature to near-liquid-helium temperature. Concerning measurements of effective g-values using an EPR spectrometer, both the sweep direction and sweep speed were taken into account to obtain accurate g-values...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Takeshi Yamane, Kenji Sugisaki, Tomoki Nakagawa, Hideto Matsuoka, Takahisa Nishio, Shigemori Kinjyo, Nobuyuki Mori, Satoshi Yokoyama, Chika Kawashima, Naoki Yokokura, Kazunobu Sato, Yuki Kanzaki, Daisuke Shiomi, Kazuo Toyota, David H Dolphin, Wei-Ching Lin, Charles A McDowell, Makoto Tadokoro, Takeji Takui
The fictitious spin-1/2 Hamiltonian approach is the putative method to analyze the fine-structure/hyperfine ESR spectra of high spin metallocomplexes having sizable zerofield splitting (ZFS), thus giving salient principal g-values far from around g = 2 without explicitly providing their ZFS parameters in most cases. Indeed, the significant departure of the g-values from g = 2 is indicative of the occurrence of their high spin states, but naturally they never agree with true g-values acquired by quantum chemical calculations such as sophisticated DFT or ab initio MO calculations...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
Peter B Karadakov, Josh Kirsopp
The carbon-carbon bonds in the ground states of C2 and C2 H2 , at their equilibrium geometries, are compared by analysing the changes in the off-nucleus magnetic shielding tensor within the space surrounding each of these molecules. A wide range of quantum-chemical approaches, including full-valence CASSCF-GIAO, CCSD(T)-GIAO and CCSDT-GIAO, all with the cc-pVQZ basis set, as well as HF-GIAO and MP2-GIAO, with the cc-pVQZ, cc-pV5Z and cc-pV6Z basis sets, show that the surroundings of the carbon-carbon bond in C2 are more shielded than those of the carbon-carbon bond in C2 H2 ...
July 17, 2017: Chemistry: a European Journal
Navadeep Shrivastava, L U Khan, J M Vargas, Carlos Ospina, J A Q Coaquira, Giorgio Zoppellaro, H F Brito, Yasir Javed, D K Shukla, M C F C Felinto, Surender K Sharma
Luminescence-tunable multicolored LaF3:xCe(3+),xGd(3+),yEu(3+) (x = 5; y = 1, 5, 10, and 15 mol%) nanoparticles have been synthesized via a low cost polyol method. Powder X-ray diffraction and high-resolution transmission electron microscopy studies confirm the hexagonal phase of the LaF3:xCe(3+),xGd(3+),yEu(3+) nanophosphors with average sizes (oval shape) ranging from 5 to 7 nm. Energy-dispersive X-ray spectroscopy analyses show the uniform distribution of Ce(3+), Gd(3+), and Eu(3+) dopants in the LaF3 host matrix...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Abinael B Oliveira, Knut Bakke
Quantum effects on a neutral particle (atom or molecule) with an induced electric dipole moment are investigated when it is subject to the Kratzer potential and a scalar potential proportional to the radial distance. In addition, this neutral is placed in a region with electric and magnetic fields. This system is analysed in both non-rotating and rotating reference frames. Then, it is shown that bound state solutions to the Schrödinger equation can be achieved and, in the search for polynomial solutions to the radial wave function, a restriction on the values of the cyclotron frequency is analysed in both reference frames...
June 2017: Royal Society Open Science
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