Volovik effect and Fermi-liquid behavior in the s-wave superconductor CaPd2As2: As75 NMR-NQR measurements

Ding, Q. -P.; Wiecki, P.; Anand, V. K.; Sangeetha, N. S.; Lee, Y.; Johnston, D. C.; Furukawa, Y.

doi:10.1103/PhysRevB.93.140502

Title: Volovik effect and Fermi-liquid behavior in the $s$ -wave superconductor ${CaPd}_{2} {As}_{2} : {}^{75}{As}$ NMR-NQR measurements

Journal Article · Thu Apr 07 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.140502· OSTI ID:1254303

Ding, Q. -P. ^[1]; Wiecki, P. ^[1]; Anand, V. K. ^[2]; Sangeetha, N. S. ^[1]; Lee, Y. ^[1]; Johnston, D. C. ^[1]; Furukawa, Y. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany)

The electronic and magnetic properties of the collapsed-tetragonal CaPd₂As₂ superconductor (SC) with a transition temperature of 1.27 K have been investigated by ⁷⁵As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. The temperature (T) dependence of the nuclear spin lattice relaxation rates (1/T₁) and the Knight shifts indicate the absence of magnetic correlations in the normal state. In the SC state, 1/T₁ measured by ⁷⁵As NQR shows a clear Hebel-Slichter (HS) peak just below T_c and decreases exponentially at lower T, confirming a conventional s-wave SC. Additionally, the Volovik effect, also known as the Doppler shift effect, has been clearly evidenced by the observation of the suppression of the HS peak with applied magnetic field.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1254303

Alternate ID(s):: OSTI ID: 1246178

Report Number(s):: IS-J-8997; PRBMDO

Journal Information:: Physical Review B, Vol. 93, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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