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Spin excitations and the Fermi surface of superconducting FeS

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arxiv 1702.02712 v1 pith:MQPBZK6L submitted 2017-02-09 cond-mat.supr-con

Spin excitations and the Fermi surface of superconducting FeS

Haoran Man , Jiangang Guo , Rui Zhang , Rico U. Schonemann , Zhiping Yin , Mingxuan Fu , M. B. Stone , Qingzhen Huang
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Yu Song Weiyi Wang David Singh Felix Lochner Tillman Hickel Ilya Eremin Leland Harriger Jeffrey W. Lynn Collin Broholm Luis Balicas Qimiao Si Pengcheng Dai
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classification cond-mat.supr-con
keywords fesenematicspinordersuperconductivityexcitationfermisuperconducting
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High-temperature superconductivity occurs near antiferromagnetic instabilities and nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superconductivity. Here, we use transport, neutron scatter- ing and Fermi surface measurements to demonstrate that hydro-thermo 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 excitation is observed up to 100 meV. No direct coupling between spin excitation 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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