このエントリーをはてなブックマークに追加
ID 15021
file
creator
Suginishi, Yuuichi
NDC
Physics
abstract
We derive critical field Hc2 equations for antiferromagnetic s -wave, d x2 - y2 -wave, and dxy -wave superconductors with effective-mass anisotropy in three dimensions, where we take into account (i) the Jaccarino-Peter mechanism of magnetic-field-induced superconductivity (FISC) at high fields, (ii) an extended Jaccarino-Peter mechanism that reduces the Pauli paramagnetic pair-breaking effect at low fields where superconductivity and an antiferromagnetic long-range order with a canted spin structure coexist, and (iii) the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO or LOFF) state. As an example, experimental phase diagrams observed in organic superconductor κ-(BETS) 2 FeBr4 are theoretically reproduced. In particular, the upper critical field of low-field superconductivity is well reproduced without any additional fitting parameter other than those determined from the critical field curves of the FISC at high fields. Therefore, the extended Jaccarino-Peter mechanism seems to occur actually in the present compound. It is predicted that the FFLO state does not occur in the FISC at high fields in contrast to the compound λ-(BETS) 2 FeCl4, but it may occur in low-field superconductivity for s -wave and d x2 - y2 -wave pairings. We also briefly discuss a possibility of compounds that exhibit unconventional behaviors of upper critical fields.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 74
issue
Issue 2
start page
024518
date of issued
2006
publisher
American Physical Society
issn
1098-0121
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006 American Physical Society
relation url
department
Graduate School of Advanced Sciences of Matter