Suppression of ferromagnetic spin correlation in the filled skutterudite superconductor SrOs<sub>4</sub>As<sub>12</sub> revealed by <sup>75</sup>As NQR-NMR
ORAL
Abstract
Recently new filled-skutterudite compounds SrT4As12 (T = Fe, Ru, Os) have been synthesized, which provides a new opportunity of systematic studies of the effects of different d electron of 3d, 4d and 5d in the systems [1]. Motivated by the recent observation of ferromagnetic spin correlations in the 3d compound SrFe4As12 [2], we have carried out nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) measurements to investigate the role of magnetic fluctuations in the newly discovered superconductor 5d-compound SrOs4As12 which exhibits a superconducting transition at Tc = 4.8 K [3]. From the temperature dependence of Knight shift K and nuclear spin lattice relaxation time T1, we found that no obvious ferromagnetic spin correlations in SrOs4As12. Furthermore, the temperature dependence of 1/T1 in the superconducting state evidences a conventional s-wave superconductivity in SrOs4As12.
[1] K. Nishine, Y. Kawamura, J. Hayashi, and C. Sekine, Jpn. J.Appl. Phys. 56, 05FB01 (2017).
[2] Q.-P, Ding, et al. Phys. Rev. B 98, 155149 (2018).
[3] Q.-P. Ding et al., Phys. Rev. B 100, 054516 (2019).
[1] K. Nishine, Y. Kawamura, J. Hayashi, and C. Sekine, Jpn. J.Appl. Phys. 56, 05FB01 (2017).
[2] Q.-P, Ding, et al. Phys. Rev. B 98, 155149 (2018).
[3] Q.-P. Ding et al., Phys. Rev. B 100, 054516 (2019).
*USDOE under Contract No. DE-AC02-07CH11358.
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Presenters
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Yuji Furukawa
- Ames Laboratory and Dept. of Phys. and Astro., Iowa State University
- Iowa State University
- Iowa State University, Ames Laboratory
- Division of Materials Sciences & Engineering, Ames Lab and Iowa State University