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23 April 2024 |
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Anisotropy Reversal of the Upper Critical Field at Low Temperatures and Spin-Locked Superconductivity in K2Cr3As3 | | F. F. Balakirev
; T. Kong
; M. Jaime
; R. D. McDonald
; C. H. Mielke
; A. Gurevich
; P. C. Canfield
; S. L. Bud'ko
; | | Date: |
21 May 2015 | | Abstract: | We report the first measurements of the anisotropic upper critical field
$H_{c2}(T)$ for K$_{2}$Cr$_{3}$As$_{3}$ single crystals up to 60 T and $T >
0.6$ K. Our results show that the upper critical field parallel to the Cr
chains, $H_{c2}^parallel (T)$, exhibits a paramagnetically-limited behavior,
whereas the shape of the $H_{c2}^perp (T)$ curve (perpendicular to the Cr
chains) has no evidence of paramagnetic effects. As a result, the curves
$H_{c2}^perp (T)$ and $H_{c2}^parallel(T)$ cross at $Tapprox 4$ K, so that
the anisotropy parameter $gamma_H(T)=H_{c2}^perp/H_{c2}^parallel (T)$
increases from $gamma_H(T_c)approx 0.35$ near $T_c$ to $gamma_H(0)approx
1.7$ at 0.6 K. This 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. | | Source: | arXiv, 1505.5547 | | Services: | Forum | Review | PDF | Favorites | |
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