Evidence for nodal superconductivity in quasi-one-dimensional K2Cr3As3
G. M. Pang, M. Smidman, W. B. Jiang, J. K. Bao, Z. F. Weng, Y. F. Wang, L. Jiao, J. L. Zhang, G. H. Cao, H. Q. Yuan
DOI 10.1103/PhysRevB.91.220502 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The recent discovery of superconductivity in the quasi-one-dimensional compound K2Cr3As3, which consists of double-walled tubes of [(Cr3As3)2−]∞ that run along the c axis, has attracted immediate attention as a potential system for studying superconductors with reduced dimensionality. Here we report clear experimental evidence for the unconventional nature of the superconducting order parameter in K2Cr3As3, by precisely measuring the temperature dependence of the change in the penetration depth Δλ(T) using a tunnel-diode oscillator. Linear behavior of Δλ(T) is observed for T≪Tc, instead of the exponential behavior of conventional superconductors, indicating that there are line nodes in the superconducting gap. This is strong evidence for unconventional behavior and may provide key information for identifying the pairing state of this super-conductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.1 | Pressure not reported | onset |
| K2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.6 | Pressure not reported | midpoint |
| Rb2Cr3As3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | unknown |
| CrAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | 0.8 GPa | unknown |
Similar papers
Unconventional superconductivity in quasi-one-dimensional Rb2Cr3As3
similarity 0.95Zhang-Tu Tang et al.
Source status unknown — claims are unverified
Evidence for triplet superconductivity near an antiferromagnetic instability in CrAs
similarity 0.93C. Y. Guo et al.
Source status unknown — claims are unverified
Ion-exchange synthesis and superconductivity at 8.6 K of Na2Cr3As3 with quasi-one-dimensional crystal structure
similarity 0.92Qing-Ge Mu et al.
Source status unknown — claims are unverified
Superconducting ground state of quasi-one-dimensional K2Cr3As3 investigated using μSR measurements
similarity 0.92D. T. Adroja et al.
Source status unknown — claims are unverified
Structural and magnetic phase diagram of CrAs and its relationship with pressure-induced superconductivity
similarity 0.92Yao Shen et al.
Source status unknown — claims are unverified
Coupling of structure to magnetic and superconducting orders in quasi-one-dimensional K2Cr3As3
similarity 0.91K. M. Taddei et al.
Source status unknown — claims are unverified