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Title: Phonons of Fe-based superconductor Ca 10Pt 4As 8(Fe 1-xPt xAs) 10

In this paper, we report the results of inelastic neutron scattering measurements on particular phonons of a superconducting (SC) Ca10Pt 4As 8(Fe 1-xPt xAs) 10 with the onset transition temperature T c ~ 33 K to investigate mainly what roles orbital fluctuation plays in Cooper pairing, where we observed a slight softening of the in-plane transverse acoustic mode corresponding to the elastic constant C 66. This softening starts at temperature T well above the superconducting T c, as T decreases. An anomalously strong change of the scattering intensity of in-plane optical modes was observed at the M point of the pseudo tetragonal reciprocal space in the range of 35 < ω < 40 meV with decreasing T from far above T c. Finally, because this ω region mainly corresponds to the motion of Fe and As atoms in the FeAs planes, the finding presents information on the coupling between the orbital fluctuation of Fe 3d electrons and the lattice system, useful for studying the possible roles of orbital fluctuation in the pairing mechanism and/or the appearance of the so-called nematic phase.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [1]
  1. Comprehensive Research Organization for Science and Society (CROSS), Tokai (Japan). Research Center for Neutron Science and Technology
  2. Nagoya Univ. (Japan). Dept. of Physics
  3. J-PARC Center, Tokai (Japan). Materials and Life Science Division (MLF)
  4. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). CEA-CNRS. Lab. Leon Brillouin
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  6. Japan Atomic Energy Agency, Kashiwa (Japan). Center for Computational Science and e-Systems (CCSE)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 10604
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 27; Journal Issue: 46; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Comprehensive Research Organization for Science and Society (CROSS), Tokai (Japan); Nagoya Univ. (Japan)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science and Technology (Japan); US-Japan Cooperative Program on Neutron Scattering Research
Contributing Orgs:
J-PARC Center, Tokai (Japan); Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Japan Atomic Energy Agency, Kashiwa (Japan)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Fe-based superconductors; superconducting symmetry; inelastic neutron scattering
OSTI Identifier:
1287020

Ikeuchi, K., Kobayashi, Y., Suzuki, K., Itoh, M., Kajimoto, R., Bourges, P., Christianson, A. D., Nakamura, H., Machida, M., and Sato, M.. Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10. United States: N. p., Web. doi:10.1088/0953-8984/27/46/465701.
Ikeuchi, K., Kobayashi, Y., Suzuki, K., Itoh, M., Kajimoto, R., Bourges, P., Christianson, A. D., Nakamura, H., Machida, M., & Sato, M.. Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10. United States. doi:10.1088/0953-8984/27/46/465701.
Ikeuchi, K., Kobayashi, Y., Suzuki, K., Itoh, M., Kajimoto, R., Bourges, P., Christianson, A. D., Nakamura, H., Machida, M., and Sato, M.. 2015. "Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10". United States. doi:10.1088/0953-8984/27/46/465701. https://www.osti.gov/servlets/purl/1287020.
@article{osti_1287020,
title = {Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10},
author = {Ikeuchi, K. and Kobayashi, Y. and Suzuki, K. and Itoh, M. and Kajimoto, R. and Bourges, P. and Christianson, A. D. and Nakamura, H. and Machida, M. and Sato, M.},
abstractNote = {In this paper, we report the results of inelastic neutron scattering measurements on particular phonons of a superconducting (SC) Ca10Pt4As8(Fe1-xPtxAs)10 with the onset transition temperature Tc ~ 33 K to investigate mainly what roles orbital fluctuation plays in Cooper pairing, where we observed a slight softening of the in-plane transverse acoustic mode corresponding to the elastic constant C66. This softening starts at temperature T well above the superconducting Tc, as T decreases. An anomalously strong change of the scattering intensity of in-plane optical modes was observed at the M point of the pseudo tetragonal reciprocal space in the range of 35 < ω < 40 meV with decreasing T from far above Tc. Finally, because this ω region mainly corresponds to the motion of Fe and As atoms in the FeAs planes, the finding presents information on the coupling between the orbital fluctuation of Fe 3d electrons and the lattice system, useful for studying the possible roles of orbital fluctuation in the pairing mechanism and/or the appearance of the so-called nematic phase.},
doi = {10.1088/0953-8984/27/46/465701},
journal = {Journal of Physics. Condensed Matter},
number = 46,
volume = 27,
place = {United States},
year = {2015},
month = {10}
}