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Neutron structural investigations of Y1−x CaxBa2Cu3−y Co y O7±δ
Springer Science and Business Media LLC - Tập 8 - Trang 271-277 - 1995
The results of a systematic powder neutron study on Y1−x CaxBa2Cu3−y Co y O7±δ
for A (x=y=0), B (x=0;y=0.2), C (x= 0;y=0.4), D (x=y=0.2), and E (x=y=0.4) are
investigated with a view to understanding the relation between the structural
parameters and superconductivity. Rietveld refinements of the structures show
that: (a) Co substitutes at the chain Cu(1) sites only, except for sample E,
where the...
Metamagnetic Phase Transitions in La1−x Nd x Mn2Si2
Springer Science and Business Media LLC - Tập 26 - Trang 1411-1413 - 2012
Experimental measurements for the magnetization at various temperatures are
analyzed using a mean field model for the purely ferromagnetic spin
configuration near the metamagnetic phase transitions in La1−x Nd x Mn2Si2
(x=0.3) at a constant magnetic field (50 mT). By fitting the temperature
dependence of the magnetization from the free energy in the mean field model to
the experimental data for th...
Spectral Properties of the Bose-Hubbard Model Within the Cluster Perturbation Theory in X-Operators Representation
Springer Science and Business Media LLC - Tập 30 - Trang 103-107 - 2016
We study the two-dimensional ultracold Bose gas in optical lattice. We use
cluster perturbation theory based on Hubbard X-operators to calculate the
spectral function and phase diagram of Bose-Hubbard model which is minimal model
to describe behavior of ultracold gases in optical lattices. We have analyzed
spectral properties of spinless bosons in a square lattice taking into account
the short-ran...
rf-SQUID Effect in Bulk Quaternary Borocarbide Superconductors
Springer Science and Business Media LLC - Tập 13 - Trang 1019-1023 - 2000
This paper reports observation of rf-SQUID effect due to natural grain boundary
junctions in YNi2B2C (T c ∼ 15.5 K), ErNi2B2C (T c ∼ 11.5 K, T N ∼ 6.5 K), and
DyNi2B2C (T c ∼ 6.5 K, T N ∼ 11K), LuNi2B2C (T c ∼ 16.5 K) and YPd5B3C0.35 (T c
∼ 23 K) bulk borocarbide superconductors. The observation of rf-SQUID effect due
to natural grain boundary junctions in all the five borocarbide superconductors
...
First-Principles Study of the Ultrafast, Laser-Induced Spin Transferability in the Multi-center Magnetic Cluster Ni3Na2
Springer Science and Business Media LLC - Tập 26 - Trang 2001-2004 - 2012
Using a full ab initio method, based on quantum chemical wave function methods
with the inclusion of spin-orbit coupling and a static external magnetic field,
we investigate the laser-induced, ultrafast spin transfer in the
three-magnetic-center cluster Ni3Na2 under various static distortions. In this
manuscript we study and identify three important factors, i.e. the interatomic
distances, the num...
Anomalous Resistivity and the Electron–Polaron Effect in the Two-Band Hubbard Model with One Narrow Band
Springer Science and Business Media LLC - Tập 25 - Trang 1379-1382 - 2012
We search for anomalous normal and superconductive behavior in the two-band
Hubbard model with one narrow band. We analyze the influence of the
electron–polaron effect and the Altshuler–Aronov effect on effective mass
enhancement and scattering times of heavy and light components in the clean
case. We find anomalous behavior of resistivity at high temperatures $T >
W_{h}^{*}$ both in 3D and 2D sit...
Potential Antiperovskite Semiconductor Compounds Mg3XN (X = P, As, Sb, Bi): the First-Principles Study
Springer Science and Business Media LLC - Tập 35 - Trang 3277-3290 - 2022
In this work, the antiperovskite semiconductor compounds Mg3XN (X = P, As, Sb,
Bi) are investigated using the first-principles calculations. The structural,
electronic, optical, and elastic properties of the Mg3XN compounds are studied
in detail. Meanwhile, the magnetism is introduced by doping Mn element in Mg3XN
compounds. Mg3XN compounds are semiconductors with direct band gap from the
analysis...
Superconducting Critical Parameter Calculation from the Analysis of the Paraconductivity in SmBa2Cu3O7–δ
Springer Science and Business Media LLC - Tập 35 - Trang 41-48 - 2021
Synthesis of the SmBa2Cu3O7–δ superconducting material by the standard
solid-state reaction is reported. DC resistivity measurements were performed to
analyse the conductivity excess close to the superconducting transition. The
fluctuation analysis was performed by the method of logarithmic temperature
derivative of the paraconductivity. A bulk Tc = 93.004 K was determined through
the extrapolatio...
Effects of Mn and Gd Co-substituted into ZnO on Structural and Magnetic Properties
Springer Science and Business Media LLC - Tập 27 - Trang 2631-2637 - 2014
We have worked on the structural and magnetic properties of Zn0.99−xMn0.01Gd x O
δ (for x = 0.02, 0.03, and 0.04) compounds prepared by using a sol–gel method.
The x-ray diffraction, scanning electron microscopy, and energy dispersive x-ray
spectroscopy were used to understand the structural properties of the samples.
We observed that co-substitution of Mn (1 %) and Gd (2–4 %) into the ZnO does
no...
Tailoring Bloch-type Stripe Domain Wall by Spin–orbit Torque for Reconfigurable Magnonic Waveguides
Springer Science and Business Media LLC - Tập 35 - Trang 3249-3254 - 2022
Efficient manipulation of magnetic textures by spin–orbit torque is of great
significance to spintronic and magnonic technologies. Here, using micromagnetic
simulations, we exploit the dynamics of a Bloch-type stripe domain wall in a
magnetic nanowire induced by the spin-Hall effect associated with a
ferromagnet/heavy metal structure. Our numerical results demonstrate that,
contrary to the Néel-ty...
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