Stabilization of Bi vibration along c-axis in BiS2-based layered compounds La(O,F)Bi(S,Se)2 by Se substitution
APPLIED PHYSICS EXPRESS(2024)
摘要
BiCh(2)-based layered compounds have been extensively studied as potential thermoelectric and unconventional superconducting materials. For both functionalities, in-plane chemical pressure effects improve their thermoelectric or superconducting properties. In this study, we investigate the effects of in-plane chemical pressure on atomic vibrations of Bi by analyzing lattice specific heat measured at T = 1.9-300 K with multiple Debye and Einstein models for thermoelectric LaOBi(S,Se)(2) and superconducting LaO0.5F0.5Bi(S,Se)(2). We reveal that in-plane chemical pressure enhances the oscillator number of the Einstein mode corresponding to large-amplitude Bi vibration along the c-axis in both the systems.
(c) 2023 The Author(s). Published on behalf of The Japan Society of Applied Physics by IOP Publishing Ltd
更多(c) 2023 The Author(s). Published on behalf of The Japan Society of Applied Physics by IOP Publishing Ltd
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关键词
BiS2-based compound,specific heat,superconductor,thermoelectric,optical phonon
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