NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor

Torchetti, D. A.; Imai, T.; Lei, H. C.; Petrovic, C.

doi:10.1103/PhysRevB.85.144516

Title: NMR characterization of sulphur substitution effects in the K_xFe_2-ySe_2-zS_z high-T_c superconductor

Journal Article · Tue Apr 17 00:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.85.144516· OSTI ID:1098744

Torchetti, D. A.; Imai, T.; Lei, H. C.; Petrovic, C.

We present a⁷⁷ Se NMR study of the effect of S substitution in the high-T_c superconductor K_xFe_2-ySe_2-zS_z in a temperature range up to 250 K. We examine two S concentrations, with z=0.8 (Tc~ 26 K) and z=1.6 (nonsuperconducting). The samples containing sulphur exhibit broader NMR line shapes than the K_xFe₂Se₂ sample due to local disorder in the Se environment. Our Knight shift ⁷⁷K data indicate that in all samples, uniform spin susceptibility decreases with temperature, and that the magnitude of the Knight shift itself decreases with increased S concentration. In addition, S substitution progressively suppresses low-frequency spin fluctuations. None of the samples exhibit an enhancement of low-frequency antiferromagnetic spin fluctuations near T_c in 1/T₁T, as seen in FeSe.

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Sponsoring Organization:: USDOE

OSTI ID:: 1098744

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Vol. 85 Journal Issue: 14; ISSN 1098-0121

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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References (31)

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