Superconductivity at 7.3 K in the 133-type Cr-based RbCr₃As₃ single crystals

¹ Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - Beijing 100190, China
² School of Physical Sciences, University of Chinese Academy of Sciences - Beijing 100049, China
³ Collaborative Innovation Center of Quantum Matter - Beijing 100190, China

^(a) renzhian@iphy.ac.cn (corresponding author)

Received: 8 November 2017
Accepted: 2 January 2018

Abstract

Here we report the preparation and superconductivity of the 133-type Cr-based quasi–one-dimensional (Q1D) RbCr₃As₃ single crystals. The samples were prepared by the deintercalation of Rb⁺ ions from the 233-type Rb₂Cr₃As₃ crystals which were grown from a high-temperature solution growth method. The RbCr₃As₃ compound crystallizes in a centrosymmetric structure with the space group P6₃/m (No. 176) different from its non-centrosymmetric Rb₂Cr₃As₃ superconducting precursor, and the refined lattice parameters are and . Electrical resistivity and magnetic susceptibility characterizations reveal the occurrence of superconductivity with an interestingly higher onset T_c of 7.3 K than other Cr-based superconductors, and an estimated high upper critical field H_c2(0) about 72.4 T in this 133-type RbCr₃As₃ crystals.