Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by As75−NMR/NQR and Pt195−NMR
Shinji Kawasaki, Yoshihiko Tani, Tomosuke Mabuchi, Kazutaka Kudo, Yoshihiro Nishikubo, Daisuke Mitsuoka, Minoru Nohara, Guo-qing Zheng
DOI 10.1103/PhysRevB.91.060510 · Physical Review B
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Abstract
The relationship between charge-density wave (CDW) orders and superconductivity in arsenide superconductor SrPt2As2 with Tc=5.2K which crystallizes in the CaBe2Ge2-type structure was studied by 75As nuclear magnetic resonance (NMR) measurements up to 520 K, and 75As nuclear quadrupole resonance (NQR) and Pt195−NMR measurements down to 1.5 K. At high temperature, As75−NMR spectrum and nuclear-spin-relaxation rate (1/T1) have revealed two distinct CDW orders, one realized in the As-Pt-As layer below TCDWAs(1)=410K and the other in the Pt-As-Pt layer below TCDWAs(2)=255K. The 1/T1 measured by As75−NQR shows a clear Hebel-Slichter peak just below Tc and decreases exponentially well below Tc. Concomitantly, Pt195 Knight shift decreases below Tc. Our results indicate that superconductivity in SrPt2As2 is in the spin-singlet state with an s-wave gap and is robust under the two distinct CDW orders in different layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrPt2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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