Tunable Electronic Anisotropy in Single-Crystal A₂Cr₃As₃ (A = K, Rb) Quasi-One-Dimensional Superconductors

Author

X. F. Wang
C. Roncaioli
C. Eckberg
Hyunsoo Kim, Missouri University of Science and TechnologyFollow
J. Yong
Y. Nakajima
S. R. Saha
P. Y. Zavalij
J. Paglione

Abstract

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.

Recommended Citation

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

Department(s)

Physics

International Standard Serial Number (ISSN)

1550-235X; 1098-0121

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 American Physical Society (APS), All rights reserved.

Publication Date

20 Jul 2015