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Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3

TitleAnisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3
Publication TypeJournal Article
Year of Publication2015
AuthorsBalakirev, FF, Kong, T, Jaime, M, McDonald, RD, Mielke, CH, Gurevich, A, Canfield, PC, Bud'ko, SL
JournalPhysical Review B
Volume91
Pagination220505
Date Published06
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000356658200003
Keywordsla-nd
Abstract

0.6 K. Our results show that the upper critical field parallel to the Cr chains, H-c2(parallel to) (T), exhibits a paramagnetically-limited behavior, whereas the shape of the H-c2(perpendicular to)(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves H-c2(perpendicular to)(T) and H-c2(parallel to)(T) cross at T\approx 4 K, so that the anisotropy parameter gamma(H)(T)=(Hc2Hc2 parallel to)-H-perpendicular to (T) increases from gamma(H)(T-c) approximate to 0.35 near T-c to gamma(H)(0)approximate to 1.7 at 0.6 K. This behavior of H-c2(parallel to)(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

DOI10.1103/PhysRevB.91.220505
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