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Title: NMR characterization of sulphur substitution effects in the K xFe 2-ySe 2-zS z high-T c superconductor

Abstract

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.

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1098744
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 85 Journal Issue: 14; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Torchetti, D. A., Imai, T., Lei, H. C., and Petrovic, C. NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor. United States: N. p., 2012. Web. doi:10.1103/PhysRevB.85.144516.
Torchetti, D. A., Imai, T., Lei, H. C., & Petrovic, C. NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor. United States. doi:10.1103/PhysRevB.85.144516.
Torchetti, D. A., Imai, T., Lei, H. C., and Petrovic, C. Tue . "NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor". United States. doi:10.1103/PhysRevB.85.144516.
@article{osti_1098744,
title = {NMR characterization of sulphur substitution effects in the KxFe2-ySe2-zSz high-Tc superconductor},
author = {Torchetti, D. A. and Imai, T. and Lei, H. C. and Petrovic, C.},
abstractNote = {We present a⁷⁷ Se NMR study of the effect of S substitution in the high-Tc superconductor KxFe2-ySe2-zSz 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 KxFe₂Se₂ 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 Tc in 1/T₁T, as seen in FeSe.},
doi = {10.1103/PhysRevB.85.144516},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 85,
place = {United States},
year = {2012},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevB.85.144516

Citation Metrics:
Cited by: 2 works
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