Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Lv, Weicheng"'
Publikováno v:
Annals of Nutrition & Metabolism, 2020 Jan 01. 76(4), 223-232.
Externí odkaz:
https://www.jstor.org/stable/48620829
Autor:
Zhang, Chenglin, Lv, Weicheng, Tan, Guotai, Song, Yu, Carr, Scott V., Chi, Songxue, Matsuda, M., Christianson, A. D., Fernandez-Baca, J. A., Harriger, L. W., Dai, Pengcheng
Neutron spin resonance, a collective magnetic excitation coupled to superconductivity, is one of the most prominent features shared by a broad family of unconventional superconductors including copper oxides, iron pnictides, and heavy fermions. In th
Externí odkaz:
http://arxiv.org/abs/1605.06890
Publikováno v:
Phys. Rev. B 90, 125158 (2014)
Using a degenerate double-exchange model, we investigate the spin excitation spectra of iron pnictides. The model consists of local spin moments on each Fe site, as well as itinerant electrons from the degenerate $d_{xz}$ and $d_{yz}$ orbitals. The l
Externí odkaz:
http://arxiv.org/abs/1406.6737
Publikováno v:
Phys. Rev. B 89, 104510 (2014)
Motivated by recent neutron scattering experiments in Fe-based superconductors, we study how the magnetic resonance in the superconducting state is affected by the simultaneous presence of either static or fluctuating magnetic orders using the random
Externí odkaz:
http://arxiv.org/abs/1310.1657
Publikováno v:
Phys. Rev. B 88, 094508 (2013)
Motivated by the recent report of superconductivity in Fe-based ladder materials, we study the pairing state of a multi-orbital t-J model defined on two-leg ladders using the standard mean-field theory. We find that the superconducting order paramete
Externí odkaz:
http://arxiv.org/abs/1307.3309
Publikováno v:
Int J. Mod. Phys. B Vol. 27, 1330014 (2013)
One central issue under intense debate in the study of the iron based superconductors is the origin of the structural phase transition that changes the crystal lattice symmetry from tetragonal to orthorhombic. This structural phase transition, occurr
Externí odkaz:
http://arxiv.org/abs/1303.6295
Publikováno v:
Phys. Rev. B 86, 094516 (2012)
We show here that orbital degrees of freedom produce a distinct signature in the magnetic excitation spectrum of iron-based superconductors above the magnetic ordering temperature. Because $d_{xz}$ and $d_{yz}$ orbitals are strongly connected with th
Externí odkaz:
http://arxiv.org/abs/1206.4095
Autor:
Lv, Weicheng, Phillips, Philip
Publikováno v:
Phys. Rev. B 84, 174512 (2011)
Recent experimental developments in the iron pnictides have unambiguously demonstrated the existence of in-plane electronic anisotropy in the absence of the long-range magnetic order. Such anisotropy can arise from orbital ordering, which is describe
Externí odkaz:
http://arxiv.org/abs/1105.4630
Publikováno v:
Phys. Rev. B 84, 155107 (2011)
We investigate the effects of the $\sqrt{5}\times\sqrt{5}$ Fe vacancy ordering on the orbital and magnetic order in (K,Tl,Cs)$_y$Fe$_{2-x}$Se$_2$ using a three-orbital ($t_{2g}$) tight-binding Hamiltonian with generalized Hubbard interactions. We fin
Externí odkaz:
http://arxiv.org/abs/1105.0432
Publikováno v:
Phys. Rev. B, vol. 82, p. 045125 (2010)
The magnetic excitations of the iron pnictides are explained within a degenerate double-exchange model. The local-moment spins are coupled by superexchanges $J_1$ and $J_2$ between nearest and next-nearest neighbors, respectively, and interact with t
Externí odkaz:
http://arxiv.org/abs/1002.3165