Document Type

Article

Publication Date

2015

DOI

10.1103/PhysRevB.91.220505

Publication Title

Physical Review B

Volume

91

Issue

22

Pages

220505 (1-5)

Abstract

We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T > 0.6K. Our results show that the upper critical field parallel to the Cr chains, H∥c2(T), exhibits a paramagnetically limited behavior, whereas the shape of the H⊥c2(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves H⊥c2(T) and H∥c2(T) cross at T ≈ 4K, so that the anisotropy parameter H(T)=H⊥c2/H∥c2(T) increases from γH(Tc) ≈ 0.35 near Tc to γH(0) ≈ 1.7 at 0.6 K. The paramagnetically limited behavior of H∥c2(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

Rights

© 2015 American Physical Society. All rights reserved.

"Yes, the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of the APS copyright must be included."

Original Publication Citation

Balakirev, F. F., Kong, T., Jaime, M., McDonald, R. D., Mielke, C. H., Gurevich, A., Canfield, P. C., & Bud'ko, S. L. (2015). Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K₂Cr₃As₃. Physical Review B, 91(22), 1-5, Article 220505. https://doi.org/10.1103/PhysRevB.91.220505

ORCID

0000-0003-0759-8941 (Gurevich)

Download

Share

COinS