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Emergence of the nematic electronic state in FeSe

DOI: 10.1103/PhysRevB.91.155106 DOI Help

Authors: Matthew Watson (Clarendon Laboratory, Department of Physics, University of Oxford) , Timur Kim (Diamond Light Source) , Amir Haghighirad (University of Oxford) , N. R. Davies (University of Oxford) , A. Mccollam (Radboud University) , Arjun Narayanan (University of Oxford) , Samuel Blake (University of Oxford) , Y L Cheng (University of Oxford) , Saman Ghannadzadeh (University of Oxford; Radboud University) , A. J. Schofield (University of Birmingham) , Moritz Hoesch (Diamond Light Source) , C. Meingast (Karlsruhe Institute of Technology) , T. Wolf (Karlsruhe Institute of Technology) , Amalia Coldea (Clarendon Laboratory, Department of Physics, University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 91 (15) , PAGES 155106

State: Published (Approved)
Published: April 2015
Diamond Proposal Number(s): 9911 , 10203

Open Access Open Access

Abstract: We present a comprehensive study of the evolution of the nematic electronic structure of FeSe using high-resolution angle-resolved photoemission spectroscopy (ARPES), quantum oscillations in the normal state, and elastoresistance measurements. Our high-resolution ARPES allows us to track the Fermi surface deformation from fourfold to twofold symmetry across the structural transition at ¡­87K , which is stabilized as a result of the dramatic splitting of bands associated with d_xz and d_yz character in the presence of strong electronic interactions. The low-temperature Fermi surface is that of a compensated metal consisting of one hole and two electron bands and is fully determined by combining the knowledge from ARPES and quantum oscillations. A manifestation of the nematic state is the significant increase in the nematic susceptibility approaching the structural transition that we detect from our elastoresistance measurements on FeSe. The dramatic changes in electronic structure cannot be explained by the small lattice distortion and, in the absence of magnetic fluctuations above the structural transition, point clearly towards an electronically driven transition in FeSe, stabilized by orbital-charge ordering.

Subject Areas: Physics, Materials

Instruments: I05-ARPES