Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10

Ikeuchi, K.; Kobayashi, Y.; Suzuki, K.; Itoh, M.; Kajimoto, R.; Bourges, P.; Christianson, A. D.; Nakamura, H.; Machida, M.; Sato, M.

doi:10.1088/0953-8984/27/46/465701

Title: Phonons of Fe-based superconductor Ca₁₀Pt₄As₈(Fe_1-xPt_xAs)₁₀

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Abstract

In this paper, we report the results of inelastic neutron scattering measurements on particular phonons of a superconducting (SC) Ca10Pt₄As₈(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 C₆₆. 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:

Ikeuchi, K. ^[1]; Kobayashi, Y. ^[2]; Suzuki, K. ^[2]; Itoh, M. ^[2]; Kajimoto, R. ^[3]; Bourges, P. ^[4]; Christianson, A. D. ^[5]; Nakamura, H. ^[6]; Machida, M. ^[6]; Sato, M. ^[1]

Comprehensive Research Organization for Science and Society (CROSS), Tokai (Japan). Research Center for Neutron Science and Technology
Nagoya Univ. (Japan). Dept. of Physics
J-PARC Center, Tokai (Japan). Materials and Life Science Division (MLF)
Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). CEA-CNRS. Lab. Leon Brillouin
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Japan Atomic Energy Agency, Kashiwa (Japan). Center for Computational Science and e-Systems (CCSE)

Publication Date:: Wed Oct 28 00:00:00 EDT 2015

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); Japan Society for the Promotion of Science and Technology (Japan); US-Japan Cooperative Program on Neutron Scattering Research

Contributing Org.:: J-PARC Center, Tokai (Japan); Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Japan Atomic Energy Agency, Kashiwa (Japan)

OSTI Identifier:: 1287020

Grant/Contract Number:: AC05-00OR22725; 10604

Resource 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

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Fe-based superconductors; superconducting symmetry; inelastic neutron scattering

Citation Formats


                    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., 2015. 
Web.  doi:10.1088/0953-8984/27/46/465701.

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                    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.  https://doi.org/10.1088/0953-8984/27/46/465701

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                    Ikeuchi, K., Kobayashi, Y., Suzuki, K., Itoh, M., Kajimoto, R., Bourges, P., Christianson, A. D., Nakamura, H., Machida, M., and Sato, M. Wed .  
"Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10".  United States.  https://doi.org/10.1088/0953-8984/27/46/465701.  https://www.osti.gov/servlets/purl/1287020.

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@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         = {Wed Oct 28 00:00:00 EDT 2015},

  month        = {Wed Oct 28 00:00:00 EDT 2015}

}

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Title: Phonons of Fe-based superconductor Ca10Pt4As8(Fe1-xPtxAs)10

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Title: Phonons of Fe-based superconductor Ca₁₀Pt₄As₈(Fe_1-xPt_xAs)₁₀