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Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by As75NMR/NQR and Pt195NMR

Shinji Kawasaki, Yoshihiko Tani, Tomosuke Mabuchi, Kazutaka Kudo, Yoshihiro Nishikubo, Daisuke Mitsuoka, Minoru Nohara, and Guo-qing Zheng
Phys. Rev. B 91, 060510(R) – Published 27 February 2015

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 Pt195NMR measurements down to 1.5 K. At high temperature, As75NMR 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 As75NQR 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.

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  • Received 6 January 2015
  • Revised 30 January 2015

DOI:https://doi.org/10.1103/PhysRevB.91.060510

©2015 American Physical Society

Authors & Affiliations

Shinji Kawasaki1,2, Yoshihiko Tani1, Tomosuke Mabuchi1, Kazutaka Kudo1,2, Yoshihiro Nishikubo1, Daisuke Mitsuoka1, Minoru Nohara1,2, and Guo-qing Zheng1,2,3

  • 1Department of Physics, Okayama University, Okayama 700-8530, Japan
  • 2Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan
  • 3Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

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Issue

Vol. 91, Iss. 6 — 1 February 2015

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