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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
Rajni Sharma, R. Ganguly, H. Rajagopal, A. Sequeira, J. V. Yakhmi, B. A. Dasannnacharya
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 on...... hiện toàn bộ
Metamagnetic Phase Transitions in La1−x Nd x Mn2Si2
Springer Science and Business Media LLC - Tập 26 - Trang 1411-1413 - 2012
B. Emre, H. Yurtseven
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 th...... hiện toàn bộ
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
Kirill Kudashkin, Sergey Nikolaev, Sergey Ovchinnikov
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...... hiện toàn bộ
rf-SQUID Effect in Bulk Quaternary Borocarbide Superconductors
Springer Science and Business Media LLC - Tập 13 - Trang 1019-1023 - 2000
Neeraj Khare, A. K. Gupta, Z. Hossain, R. Nagarajan, L. C. Gupta
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 ...... hiện toàn bộ
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
Hongping Xiang, Georgios Lefkidis, Wolfgang Hübner
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...... hiện toàn bộ
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
M. Y. Kagan, V. V. Val’kov
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 ...... hiện toàn bộ
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
Zhong-yue Gao, Wei Wang, Bo-chen Li, Lei Sun, Feng Wang
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...... hiện toàn bộ
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
G. Pineda-Peña, E. M. Vargas-Pineda, L. J. Rivera-Contreras, David A. Landínez Téllez, J. Roa-Rojas
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...... hiện toàn bộ
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
Kenan Bulcar, Mustafa Akyol, Gönül Akça, Ali Osman Ayaş, Mustafa Topaksu, Ahmet Ekicibil
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 ...... hiện toàn bộ
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
Jingsi Li, Xiangjun Xing
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...... hiện toàn bộ
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