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arXiv 2108.07982cond-mat.supr-con
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强耦合超导体IrGe超导特性的μSR微观研究

Microscopic investigation of superconducting properties of a strongly coupledsuperconductor IrGe via μSR

Arushi, Kapil Motla, P. K. Meena, S. Sharma, D. Singh, P. K. Biswas, A. D. Hillier, R. P. Singh

摘要:

探索具有不同于BCS预言的s波的配对机制的超导体一直吸引着人们的极大兴趣。具有低位声子的超导体可以表现出非常规的超导性,因为电子与这些低位声子的耦合可以潜在地影响超导基态的性质,导致强耦合的超导性。在这项工作中,我们利用磁化强度、交流输运、比热和μ子自旋旋转/弛豫($μ$ SR)测量,详细研究了强耦合超导体IrGe的超导基态,其转变温度T $_{C}$为4.7 K.比热(SH)和横向场$μ$ SR最好用具有强电子-声子耦合的各向同性s波模型来描述,由$Δ(0)/k_{B}T_{C}$ = 2.3,2.1(SH,$μ$ SR)和$ΔC_{el}/γ_{n}T_{C}$ = 2.7的值表示。零场$μ$ SR测量证实了IrGe超导态的时间反演对称性的存在。

英文摘要:

Exploring superconductors which can possess pairing mechanism other than the BCS predicted s-wave have continually attracted considerable interest. Superconductors with low-lying phonons may exhibit unconventional superconductivity as the coupling of electrons with these low-lying phonons can potentially affect the nature of the superconducting ground state, resulting in strongly coupled superconductivity. In this work, by using magnetization, AC transport, specific heat, and muon spin rotation/relaxation ($μ$SR) measurements, we report a detailed investigation on the superconducting ground state of the strongly coupled superconductor, IrGe, that has a transition temperature, T$_{C}$, at 4.7 K. Specific heat (SH), and transverse field $μ$SR is best described with an isotropic s-wave model with strong electron-phonon coupling, indicated by the values of both $Δ(0)/k_{B}T_{C}$ = 2.3, 2.1 (SH, $μ$SR), and $ΔC_{el}/γ_{n}T_{C}$ = 2.7. Zero-field $μ$SR measurements confirm the presence of time-reversal symmetry in the superconducting state of IrGe.

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