Unconventional superconductivity in quasi-one-dimensional Rb2Cr3As3
Zhang-Tu Tang, Jin-Ke Bao, Yi Liu, Yun-Lei Sun, Abduweli Ablimit, Hui-Fei Zhai, Hao Jiang, Chun-Mu Feng, Zhu-An Xu, Guang-Han Cao
DOI 10.1103/PhysRevB.91.020506 · Physical Review B
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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 Rb2Cr3As3 manifests itself as another example of an unconventional superconductor in the Cr3As3-chain based system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | onset |
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | onset |
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.4 | Pressure not reported | midpoint |
| K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | unknown |
| Tl2Mo6Se6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | unknown |
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