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Title: Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe

Abstract

Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high temperature superconductivity (HTS). By contrast, the parent phase of iron-based HTS is never a correlated insulator. But this distinction may be deceptive because Fe has five active d-orbitals while Cu has only one. In theory, such orbital multiplicity can generate a Hund’s Metal state, in which alignment of the Fe spins suppresses inter-orbital fluctuations producing orbitally selective strong correlations. The spectral weights Z m of quasiparticles associated with different Fe orbitals m should then be radically different. Here we use quasiparticle scattering interference resolved by orbital content to explore these predictions in FeSe. Signatures of strong, orbitally selective differences of quasiparticle Z m appear on all detectable bands over a wide energy range. Further, the quasiparticle interference amplitudes reveal that Z xy < Z xz « Z yz , consistent with earlier orbital-selective Cooper pairing studies. Thus, orbital-selective strong correlations dominate the parent state of iron-based HTS in FeSe.

Authors:
 [1]; ORCiD logo [1];  [2];  [1];  [3];  [4];  [5]; ORCiD logo [6];  [7]
  1. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Univ. Leipzig (Germany)
  3. Ames Lab., Ames, IA (United States); Karlsruhe Inst. of Technology (KIT) (Germany)
  4. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  5. Univ. of Florida, Gainesville, FL (United States)
  6. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  7. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of St. Andrews, Scotland (United Kingdom)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Ames Lab., Ames, IA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1477246
Alternate Identifier(s):
OSTI ID: 1482090
Report Number(s):
IS-J-9710; BNL-209435-2018-JAAM
Journal ID: ISSN 1476-1122; PII: 151
Grant/Contract Number:  
AC02-07CH11358; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 10; Journal ID: ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kostin, A., Sprau, P. O., Kreisel, A., Chong, Yi Xue, Böhmer, A. E., Canfield, P. C., Hirschfeld, P. J., Andersen, B. M., and Davis, J. C. Séamus. Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe. United States: N. p., 2018. Web. doi:10.1038/s41563-018-0151-0.
Kostin, A., Sprau, P. O., Kreisel, A., Chong, Yi Xue, Böhmer, A. E., Canfield, P. C., Hirschfeld, P. J., Andersen, B. M., & Davis, J. C. Séamus. Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe. United States. doi:10.1038/s41563-018-0151-0.
Kostin, A., Sprau, P. O., Kreisel, A., Chong, Yi Xue, Böhmer, A. E., Canfield, P. C., Hirschfeld, P. J., Andersen, B. M., and Davis, J. C. Séamus. Mon . "Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe". United States. doi:10.1038/s41563-018-0151-0. https://www.osti.gov/servlets/purl/1477246.
@article{osti_1477246,
title = {Imaging orbital-selective quasiparticles in the Hund’s metal state of FeSe},
author = {Kostin, A. and Sprau, P. O. and Kreisel, A. and Chong, Yi Xue and Böhmer, A. E. and Canfield, P. C. and Hirschfeld, P. J. and Andersen, B. M. and Davis, J. C. Séamus},
abstractNote = {Strong electronic correlations, emerging from the parent Mott insulator phase, are key to copper-based high temperature superconductivity (HTS). By contrast, the parent phase of iron-based HTS is never a correlated insulator. But this distinction may be deceptive because Fe has five active d-orbitals while Cu has only one. In theory, such orbital multiplicity can generate a Hund’s Metal state, in which alignment of the Fe spins suppresses inter-orbital fluctuations producing orbitally selective strong correlations. The spectral weights Zm of quasiparticles associated with different Fe orbitals m should then be radically different. Here we use quasiparticle scattering interference resolved by orbital content to explore these predictions in FeSe. Signatures of strong, orbitally selective differences of quasiparticle Zm appear on all detectable bands over a wide energy range. Further, the quasiparticle interference amplitudes reveal that Zxy < Zxz « Zyz , consistent with earlier orbital-selective Cooper pairing studies. Thus, orbital-selective strong correlations dominate the parent state of iron-based HTS in FeSe.},
doi = {10.1038/s41563-018-0151-0},
journal = {Nature Materials},
number = 10,
volume = 17,
place = {United States},
year = {2018},
month = {9}
}

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