Spin excitations and the Fermi surface of superconducting FeS

Haoran Man; Jiangang Guo; Rui Zhang; Rico Schönemann; Zhiping Yin; Mingxuan Fu; Matthew B. Stone; Qingzhen Huang; Yu Song; Weiyi Wang; David J. Singh; Felix Lochner; Tilmann Hickel; Ilya Eremin; Leland Harriger; Jeffrey W. Lynn; Collin Broholm; Luis Balicas; Qimiao Si; Pengcheng Dai

doi:10.1038/s41535-017-0019-6

Spin excitations and the Fermi surface of superconducting FeS

Haoran Man, Jiangang Guo, Rui Zhang, Rico Schönemann, Zhiping Yin, Mingxuan Fu, Matthew B. Stone, Qingzhen Huang, Yu Song, Weiyi Wang, David J. Singh, Felix Lochner, Tilmann Hickel, Ilya Eremin, Leland Harriger, Jeffrey W. Lynn, Collin Broholm, Luis Balicas, Qimiao Si, Pengcheng Dai

Direct Geometry

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12 Scopus citations

Abstract

High-temperature superconductivity occurs near antiferromagnetic instabilities and the nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superconductivity. Here, we use transport, neutron scattering and Fermi surface measurements to demonstrate that hydrothermo grown superconducting FeS, an isostructure of FeSe, is a tetragonal paramagnet without nematic order and with a quasiparticle mass significantly reduced from that of FeSe. Only stripe-type spin excitations are observed up to 100 meV. No direct coupling between spin excitations and superconductivity in FeS is found, suggesting that FeS is less correlated and the nematic order in FeSe is due to competing checkerboard and stripe spin fluctuations.

Original language	English
Article number	19
Journal	npj Quantum Materials
Volume	2
Issue number	1
DOIs	https://doi.org/10.1038/s41535-017-0019-6
State	Published - Dec 1 2017

Funding

The single crystal growth and neutron scattering work at Rice is supported by the U.S. DOE, BES under contract no. DE-SC0012311 (P.D.). A part of the materials work at Rice is supported by the Robert A. Welch Foundation Grants No. C-1839 (P.D.). The theoretical work at Rice is supported by the NSF Grant No. DMR-1611392 and the Robert A. Welch Foundation Grant No. C-1411 (Q.S.). Z.P.Y acknowledges financial support by the National Natural Science Foundation of China, Grant No. 11674030, the National Key Research and Development Program of China under contract No. 2016YFA0302300. L.B. is supported by DOE-BES through award DE-SC0002613. The NHMFL is supported by NSF through NSF-DMR-1157490 and the State of Florida. The use of ORNL's SNS was sponsored by the Scientific User Facilities Division, Office of BES, US DOE. The work at JHU was supported by the US DOE, BES, Division of Materials Sciences and Engineering under award DE-FG02-08ER46544 (CB). I.E. was supported by the joint DFG-ANR Project (ER 463/8-1) and DAAD PPP USA N57316180.

Funders	Funder number
DFG-ANR	ER 463/8-1
DOE-BES	DE-SC0002613, NSF-DMR-1157490
Office of BES
Scientific User Facilities Division
State of Florida
U.S. Department of Energy
Welch Foundation	C-1839, DMR-1611392, C-1411
Basic Energy Sciences	DE-SC0012311
Division of Materials Sciences and Engineering	DE-FG02-08ER46544
Deutscher Akademischer Austauschdienst
National Natural Science Foundation of China	11674030
Norsk Sykepleierforbund
National Key Research and Development Program of China	2016YFA0302300

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Man, H., Guo, J., Zhang, R., Schönemann, R., Yin, Z., Fu, M., Stone, M. B., Huang, Q., Song, Y., Wang, W., Singh, D. J., Lochner, F., Hickel, T., Eremin, I., Harriger, L., Lynn, J. W., Broholm, C., Balicas, L., Si, Q., & Dai, P. (2017). Spin excitations and the Fermi surface of superconducting FeS. npj Quantum Materials, 2(1), Article 19. https://doi.org/10.1038/s41535-017-0019-6

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abstract = "High-temperature superconductivity occurs near antiferromagnetic instabilities and the nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superconductivity. Here, we use transport, neutron scattering and Fermi surface measurements to demonstrate that hydrothermo grown superconducting FeS, an isostructure of FeSe, is a tetragonal paramagnet without nematic order and with a quasiparticle mass significantly reduced from that of FeSe. Only stripe-type spin excitations are observed up to 100 meV. No direct coupling between spin excitations and superconductivity in FeS is found, suggesting that FeS is less correlated and the nematic order in FeSe is due to competing checkerboard and stripe spin fluctuations.",

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AU - Fu, Mingxuan

AU - Stone, Matthew B.

AU - Huang, Qingzhen

AU - Song, Yu

AU - Wang, Weiyi

AU - Singh, David J.

AU - Lochner, Felix

AU - Hickel, Tilmann

AU - Eremin, Ilya

AU - Harriger, Leland

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AB - High-temperature superconductivity occurs near antiferromagnetic instabilities and the nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superconductivity. Here, we use transport, neutron scattering and Fermi surface measurements to demonstrate that hydrothermo grown superconducting FeS, an isostructure of FeSe, is a tetragonal paramagnet without nematic order and with a quasiparticle mass significantly reduced from that of FeSe. Only stripe-type spin excitations are observed up to 100 meV. No direct coupling between spin excitations and superconductivity in FeS is found, suggesting that FeS is less correlated and the nematic order in FeSe is due to competing checkerboard and stripe spin fluctuations.

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Spin excitations and the Fermi surface of superconducting FeS

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