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Title: Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2}

Abstract

Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} by means of x-ray powder diffraction, neutron scattering, muon-spin rotation ({mu}SR), and magnetic force microscopy (MFM). Static antiferromagnetic order sets in below T{sub m}{approx_equal}70 K as inferred from the neutron scattering and zero-field-{mu}SR data. Transverse-field {mu}SR below T{sub c} shows a coexistence of magnetically ordered and nonmagnetic states, which is also confirmed by MFM imaging. We explain such coexistence by electronic phase separation into antiferromagnetic and superconducting- or normal-state regions on a lateral scale of several tens of nanometers. Our findings indicate that such mesoscopic phase separation can be considered an intrinsic property of some iron pnictide superconductors.

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2];  [2];  [3];  [3];  [4];  [5];  [4]; ; ;  [6]
  1. Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, 70569 Stuttgart (Germany)
  2. Laboratory for Neutron Scattering, ETHZ and PSI, CH-5232 Villigen PSI (Switzerland)
  3. (Denmark)
  4. Department of Physics and Fribourg Center for Nanomaterials, University of Fribourg, Chemin du Musee 3, CH-1700 Fribourg (Switzerland)
  5. (United Kingdom)
  6. IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden (Germany)
Publication Date:
OSTI Identifier:
21180308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 102; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevLett.102.117006; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; BARIUM COMPOUNDS; IRON; IRON ARSENIDES; MAGNETIC FIELDS; MUON SPIN RELAXATION; NEUTRON DIFFRACTION; PNICTIDES; POTASSIUM COMPOUNDS; SUPERCONDUCTORS; X-RAY DIFFRACTION

Citation Formats

Park, J. T., Inosov, D. S., Sun, G. L., Haug, D., Dinnebier, R., Boris, A. V., Yang, Xiaoping, Lin, C. T., Keimer, B., Hinkov, V., Niedermayer, Ch., Christensen, N. B., Materials Research Department, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Drew, A. J., Physics Department, Queen Mary, University of London, London, E1 4NS, Schulz, L., Shapoval, T., Wolff, U., and Neu, V. Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2}. United States: N. p., 2009. Web. doi:10.1103/PHYSREVLETT.102.117006.
Park, J. T., Inosov, D. S., Sun, G. L., Haug, D., Dinnebier, R., Boris, A. V., Yang, Xiaoping, Lin, C. T., Keimer, B., Hinkov, V., Niedermayer, Ch., Christensen, N. B., Materials Research Department, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Drew, A. J., Physics Department, Queen Mary, University of London, London, E1 4NS, Schulz, L., Shapoval, T., Wolff, U., & Neu, V. Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2}. United States. doi:10.1103/PHYSREVLETT.102.117006.
Park, J. T., Inosov, D. S., Sun, G. L., Haug, D., Dinnebier, R., Boris, A. V., Yang, Xiaoping, Lin, C. T., Keimer, B., Hinkov, V., Niedermayer, Ch., Christensen, N. B., Materials Research Department, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Drew, A. J., Physics Department, Queen Mary, University of London, London, E1 4NS, Schulz, L., Shapoval, T., Wolff, U., and Neu, V. Fri . "Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2}". United States. doi:10.1103/PHYSREVLETT.102.117006.
@article{osti_21180308,
title = {Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2}},
author = {Park, J. T. and Inosov, D. S. and Sun, G. L. and Haug, D. and Dinnebier, R. and Boris, A. V. and Yang, Xiaoping and Lin, C. T. and Keimer, B. and Hinkov, V. and Niedermayer, Ch. and Christensen, N. B. and Materials Research Department, Risoe National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen and Drew, A. J. and Physics Department, Queen Mary, University of London, London, E1 4NS and Schulz, L. and Shapoval, T. and Wolff, U. and Neu, V.},
abstractNote = {Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba{sub 1-x}K{sub x}Fe{sub 2}As{sub 2} by means of x-ray powder diffraction, neutron scattering, muon-spin rotation ({mu}SR), and magnetic force microscopy (MFM). Static antiferromagnetic order sets in below T{sub m}{approx_equal}70 K as inferred from the neutron scattering and zero-field-{mu}SR data. Transverse-field {mu}SR below T{sub c} shows a coexistence of magnetically ordered and nonmagnetic states, which is also confirmed by MFM imaging. We explain such coexistence by electronic phase separation into antiferromagnetic and superconducting- or normal-state regions on a lateral scale of several tens of nanometers. Our findings indicate that such mesoscopic phase separation can be considered an intrinsic property of some iron pnictide superconductors.},
doi = {10.1103/PHYSREVLETT.102.117006},
journal = {Physical Review Letters},
number = 11,
volume = 102,
place = {United States},
year = {Fri Mar 20 00:00:00 EDT 2009},
month = {Fri Mar 20 00:00:00 EDT 2009}
}