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Title: Suppression of ferromagnetic spin fluctuations in the filled skutterudite superconductor SrOs 4 As 12 revealed by As 75 NMR-NQR measurements

Journal Article · · Physical Review B

Motivated by the recent observation of ferromagnetic spin correlations in the filled skutterudite SrFe4As12 [Q.-P. Ding et al., Phys. Rev. B 98, 155149 (2018)], we have performed 75As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements to investigate the role of magnetic fluctuations in the newly discovered isostructural superconductor SrOs4As12 with a superconducting transition temperature of Tc ~ 4.8 K. Here, knight shift K determined by the NQR spectrum under a small magnetic field ( ≤ 0.5 T) is nearly independent of temperature, consistent with the temperature dependence of the magnetic susceptibility. The nuclear spin-lattice relaxation rate divided by temperature, 1/T1T, is nearly independent of temperature above ~ 50 K and increases slightly with decreasing temperature below the temperature. The temperature dependence is reasonably explained by a simple model where a flat band structure with a small ledge near the Fermi energy is assumed. By comparing the present NMR data with those in SrFe4As12, we found that the values of | K | and 1/T1T in SrFe4As12 are smaller than those in SrFe4As12, indicating no obvious ferromagnetic spin correlations in SrFe4As12. From the temperature dependence of 1/T1T in the superconducting state, an s -wave superconductivity is realized.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; 23340092
OSTI ID:
1560336
Alternate ID(s):
OSTI ID: 1558827
Report Number(s):
IS-J-10007; PRBMDO; TRN: US2000464
Journal Information:
Physical Review B, Vol. 100, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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