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Unconventional superconductivity in quasi-one-dimensional Rb2Cr3As3.

Authors :
Zhang-Tu Tang
Jin-Ke Bao
Yi Liu
Yun-Lei Sun
Ablimit, Abduweli
Hui-Fei Zhai
Hao Jiang
Chun-Mu Feng
Zhu-An Xu
Guang-Han Cao
Source :
Physical Review B: Condensed Matter & Materials Physics. Jan2015, Vol. 91 Issue 2, p020506-1-020506-5. 5p.
Publication Year :
2015

Abstract

Following the discovery of superconductivity in quasi-one-dimensional K2Cr3As3 containing [(Cr3As3)2-]∞ chains (J. K. Bao et al., arXiv:1412.0067), we succeeded in synthesizing an analogous compound, Rb2Cr3As3, which also crystallizes in a hexagonal lattice. The replacement of K by Rb results in an expansion of the a axis by 3%, indicating a weaker interchain coupling in Rb2Cr3As3. Bulk superconductivity emerges at 4.8 K, above which the normal-state resistivity shows a linear temperature dependence up to 35 K. The estimated upper critical field at zero temperature exceeds the Pauli paramagnetic limit by a factor of 2. Furthermore, the electronic specific-heat coefficient extrapolated to zero temperature in the mixed state increases with √H, suggesting the existence of nodes in the superconducting energy gap. Hence Rb2Cr3 As3 manifests itself as another example of an unconventional superconductor in the Cr3As3-chain based system. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10980121
Volume :
91
Issue :
2
Database :
Academic Search Index
Journal :
Physical Review B: Condensed Matter & Materials Physics
Publication Type :
Academic Journal
Accession number :
101508169
Full Text :
https://doi.org/10.1103/PhysRevB.91.020506