119Sn NMR study in the normal state of the superconductor Ca3Ir4Sn13

Bin Chen; JinHu Yang; Yang Guo; Kazuyoshi Yoshimura

doi:10.1209/0295-5075/111/17005

All issues

Volume 111 / No 1 (July 2015)

EPL, 111 1 (2015) 17005

Abstract

Issue		EPL Volume 111, Number 1, July 2015


Article Number		17005
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/111/17005
Published online		29 July 2015

EPL, 111 (2015) 17005

¹¹⁹Sn NMR study in the normal state of the superconductor Ca₃Ir₄Sn₁₃

Bin Chen¹^,2^(a), JinHu Yang¹, Yang Guo¹ and Kazuyoshi Yoshimura²

¹ Hangzhou Key Laboratory of Quantum Matter, Department of Physics, Hangzhou Normal University Hangzhou 310036, China
² Department of Chemistry, Graduate School of Science, Kyoto University - Kyoto 606-8502, Japan

^(a) chenbinguanxin@hotmail.com

Received: 9 March 2015
Accepted: 4 July 2015

Abstract

We report a ¹¹⁹Sn nuclear magnetic resonance (NMR) investigation of Ca₃Ir₄Sn₁₃ with superconducting transition temperature $T_c = 7\ \text{K}$ . The anomaly observed at $T^* = 45\ \text{K}$ in susceptibility and resistivity has been successfully identified by both Knight shift K and the temperature-divided spin lattice relaxation rate, $1/T_1T$ . Detailed analysis indicates that the hyperfine coupling constant changes at $T^*$ , suggesting the variation of the electronic states with temperature approaching 45 K. Furthermore, shows a linear behavior with magnetic susceptibility χ above $T^*$ , indicating the existence of three-dimensional ferromagnetic spin fluctuations in the normal state of Ca₃Ir₄Sn₁₃ above 45 K. The relation between spin fluctuations and superconductivity is discussed.

PACS: 74.70.-b – Superconducting materials other than cuprates / 76.60.-k – Nuclear magnetic resonance and relaxation

© EPLA, 2015

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