Tunable Electronic Anisotropy in Single-Crystal A₂Cr₃As₃ (A = K, Rb) Quasi-One-Dimensional Superconductors
Single crystals of A2Cr3As3(A = K, Rb) were successfully grown using a self-flux method and studied via structural, transport, and thermodynamic measurement techniques. The superconducting state properties between the two species are similar, with critical temperatures of 6.1 and 4.8 K in K2Cr3As3 and RB2Cr3As3, respectively. However, the emergence of a strong normal state electronic anisotropy in RB2Cr3As3 suggests a unique electronic tuning parameter is coupled to the interchain spacing in the A2Cr3As3 structure, which increases with alkali-metal ionic size while the one-dimensional [(Cr3As3)2-]∞ chain structure itself remains essentially unchanged. Together with dramatic enhancements in both conductivity and magnetoresistance (MR), the appearance of a strong anisotropy in the MR of RB2Cr3As3 is consistent with the proposed quasi-one-dimensional character of band structure and its evolution with alkali-metal species in this new family of superconductors.
X. F. Wang et al., "Tunable Electronic Anisotropy in Single-Crystal A₂Cr₃As₃ (A = K, Rb) Quasi-One-Dimensional Superconductors," Physical Review B - Condensed Matter and Materials Physics, vol. 92, no. 2, article no. 20508, American Physical Society (APS), Jul 2015.
The definitive version is available at https://doi.org/10.1103/PhysRevB.92.020508
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20 Jul 2015