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Title: Effect of Fermi surface nesting on resonant spin excitations in Ba{<_1-x}K{<_x}Fe{<_2}As{<_2}.

Abstract

We report inelastic neutron scattering measurements of the resonant spin excitations in Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} over a broad range of electron band filling. The fall in the superconducting transition temperature with hole doping coincides with the magnetic excitations splitting into two incommensurate peaks because of the growing mismatch in the hole and electron Fermi surface volumes, as confirmed by a tight-binding model with s{sub {+-}}-symmetry pairing. The reduction in Fermi surface nesting is accompanied by a collapse of the resonance binding energy and its spectral weight, caused by the weakening of electron-electron correlations.

Authors:
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  1. (Materials Science Division)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1028615
Report Number(s):
ANL/MSD/JA-70828
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1105563
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 17; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARIUM COMPOUNDS; BINDING ENERGY; CORRELATIONS; ELECTRONS; FERMI LEVEL; HOLES; INELASTIC SCATTERING; IRON ARSENIDES; NEUTRONS; POTASSIUM COMPOUNDS; REDUCTION; RESONANCE; SPIN; SUPERCONDUCTIVITY; SYMMETRY; TRANSITION TEMPERATURE; WEIGHT

Citation Formats

Castellan, J.-P., Rosenkranz, S., Goremychkin, E.A., Chung, D.Y., Todorov, I.S., Kanatzidis, M.G., Eremin, I., Knolle, J., Chubukov, A.V., Maiti, s., Norman, M.R., Weber, F., Claus, H., Guidi, T., Bewley, R.I., Osborn, R., Northwestern Univ.), Ruhr Univ.), Max-Planck-Institut fur Physik komplexer Systeme), Univ. Wisconsin-Madison), and Rutherford AppletonLab). Effect of Fermi surface nesting on resonant spin excitations in Ba{<_1-x}K{<_x}Fe{<_2}As{<_2}.. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.107.177003.
Castellan, J.-P., Rosenkranz, S., Goremychkin, E.A., Chung, D.Y., Todorov, I.S., Kanatzidis, M.G., Eremin, I., Knolle, J., Chubukov, A.V., Maiti, s., Norman, M.R., Weber, F., Claus, H., Guidi, T., Bewley, R.I., Osborn, R., Northwestern Univ.), Ruhr Univ.), Max-Planck-Institut fur Physik komplexer Systeme), Univ. Wisconsin-Madison), & Rutherford AppletonLab). Effect of Fermi surface nesting on resonant spin excitations in Ba{<_1-x}K{<_x}Fe{<_2}As{<_2}.. United States. doi:10.1103/PhysRevLett.107.177003.
Castellan, J.-P., Rosenkranz, S., Goremychkin, E.A., Chung, D.Y., Todorov, I.S., Kanatzidis, M.G., Eremin, I., Knolle, J., Chubukov, A.V., Maiti, s., Norman, M.R., Weber, F., Claus, H., Guidi, T., Bewley, R.I., Osborn, R., Northwestern Univ.), Ruhr Univ.), Max-Planck-Institut fur Physik komplexer Systeme), Univ. Wisconsin-Madison), and Rutherford AppletonLab). Sat . "Effect of Fermi surface nesting on resonant spin excitations in Ba{<_1-x}K{<_x}Fe{<_2}As{<_2}.". United States. doi:10.1103/PhysRevLett.107.177003.
@article{osti_1028615,
title = {Effect of Fermi surface nesting on resonant spin excitations in Ba{<_1-x}K{<_x}Fe{<_2}As{<_2}.},
author = {Castellan, J.-P. and Rosenkranz, S. and Goremychkin, E.A. and Chung, D.Y. and Todorov, I.S. and Kanatzidis, M.G. and Eremin, I. and Knolle, J. and Chubukov, A.V. and Maiti, s. and Norman, M.R. and Weber, F. and Claus, H. and Guidi, T. and Bewley, R.I. and Osborn, R. and Northwestern Univ.) and Ruhr Univ.) and Max-Planck-Institut fur Physik komplexer Systeme) and Univ. Wisconsin-Madison) and Rutherford AppletonLab)},
abstractNote = {We report inelastic neutron scattering measurements of the resonant spin excitations in Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} over a broad range of electron band filling. The fall in the superconducting transition temperature with hole doping coincides with the magnetic excitations splitting into two incommensurate peaks because of the growing mismatch in the hole and electron Fermi surface volumes, as confirmed by a tight-binding model with s{sub {+-}}-symmetry pairing. The reduction in Fermi surface nesting is accompanied by a collapse of the resonance binding energy and its spectral weight, caused by the weakening of electron-electron correlations.},
doi = {10.1103/PhysRevLett.107.177003},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 17,
volume = 107,
place = {United States},
year = {2011},
month = {1}
}