Nature of the Spin Resonance Mode in CeCoIn5

Published

May 29, 2020

Author(s)

Yu Song, Weiyi Wang, John S. Van Dyke, Naveen Pouse, Sheng Ran, Duygu Yazici, Astrid Schneidewind, Petr Cermak, Yiming Qiu, M. B. Maple, Dirk K. Morr, Pengcheng Dai

Abstract

Complex intertwined orders often emerge in strongly correlated electron materials in the vicinity of unconventional superconductivity. Superconductivity is typically optimized when such orders are suppressed, although associated fluctuations remain intense and possibly bind Cooper pairs. In the d-wave superconductor CeCoIn₅, we use inelastic neutron scattering to identify two components in the magnetic fluctuation spectrum with qualitatively different structures in momentum space and behaviors under applied magnetic field. One component is centered at incommensurate wave vectors Q = (0.5 ±δ, 0.5 ±δ, 0.5) and condenses into magnetic Bragg peaks in the so-called Q phase the commensurate wave vectorQ = (0.5, 0.5, 0.5) and splits into a doublet under applied magnetic field. Both components are present at low energies just above the superconductivity-induced spin gap, and the overlap results in a smaller apparent splitting δ compared to magnetic order upon insertion of a small concentration of Nd impurities. The magnetic fluctuation spectrum with two components in CeCoIn₅ is reminiscent of those in copper oxide superconductors and suggest similar mechanisms for d-wave superconductivity in the two systems.

Citation

Communications Physics

Volume

3

Issue

1

Pub Type

Journals

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Keywords

superconductivity, magnetic excitations, neutron scattering

Citation

Song, Y. , Wang, W. , Van Dyke, J. , Pouse, N. , Ran, S. , Yazici, D. , Schneidewind, A. , Cermak, P. , Qiu, Y. , Maple, M. , Morr, D. and Dai, P. (2020), Nature of the Spin Resonance Mode in CeCoIn₅, Communications Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923892 (Accessed October 31, 2024)