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19 April 2024 |
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Article overview
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Unconventional Superconductivity Revealed by Peculiar Angular Dependence of the Upper Critical Field in K2Cr3As3 | | Huakun Zuo
; Jin-Ke Bao
; Yi Liu
; Jinhua Wang
; Zhao Jin
; Zhengcai Xia
; Liang Li
; Zhuan Xu
; Zengwei Zhu
; Guang-Han Cao
; | | Date: |
19 Nov 2015 | | Abstract: | The upper critical magnetic field $H_{mathrm{c2}}$ of a superconductor
measures the strength of superconductivity in response to external magnetic
fields, which gives clues to the superconducting Cooper pairing. In this paper,
we report measurements of $H_{mathrm{c2}}$ as functions of temperature $T$,
polar angle $ heta$ and azimuthal angle $phi$ of the applied magnetic field
direction, for a newly discovered superconductor K$_{2}$Cr$_{3}$As$_{3}$ with a
quasi-one-dimensional and non-centrosymmetric crystal structure. We demonstrate
that the anisotropy reversal in $H_{mathrm{c2}}(T)$ reported previously comes
from a fully anisotropic Pauli-limiting effect. The $H_{mathrm{c2}}( heta)$
data reveal an intrinsic uniaxially effective-mass anisotropy
($m_{ot}/m_{parallel}sim$ 2.0) with an extrapolated orbitally limited field
of 510.5 kOe at zero temperature. More interestingly, the in-plane
$H_{mathrm{c2}}(phi)$ profile shows a unique threefold modulation, which
breaks the time-reversal symmetry. The $H_{mathrm{c2}}( heta, phi, T)$
behaviours strongly suggest unconventional superconductivity characterized by a
dominant triplet Cooper pairing with odd parity in K$_{2}$Cr$_{3}$As$_{3}$. | | Source: | arXiv, 1511.6169 | | Services: | Forum | Review | PDF | Favorites | |
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