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Anisotropic thermoelectric and superconducting properties of the bulk misfit-layered (SnSe)1.17(TaSe2) compound
Current Applied Physics ( IF 2.4 ) Pub Date : 2021-05-08 , DOI: 10.1016/j.cap.2021.04.018
Jin Hee Kim , Jae Hyun Yun , Yoo Jang Song , Jong-Soo Rhyee

We present the thermoelectric and superconducting properties of the bulk misfit-layered (SnSe)1.17(TaSe2) compound with the critical temperature (Tc ~ 3.8 K). From XRD and electrical resistivity, the anisotropic properties of the misfit-layered compound by the preferred orientation were observed. The zero-temperature-limit upper critical field Hc2(0) and coherence length ξ are obtained by Hc2(0) = 8.94 T and ξ = 6.1 nm. The electron-phonon coupling constant (λe-p = 0.735) and the specific heat jump (ΔCe/γTc ~ 1.4) imply that the (SnSe)1.17(TaSe2) compound is a weak coupled conventional s-wave superconductor. Density functional theory (DFT) calculation results show that some electronic charge transfers from the SnSe layers into the TaSe2 layers. In addition, the thermoelectric properties of the bulk misfit-layered (SnSe)1.17(TaSe2) compound show significant anisotropic properties.



中文翻译:

错配层状(SnSe)1.17(TaSe 2)化合物的各向异性热电和超导性能

我们提出的大部分失配层电极(位SnSe)的热电和超导性能1.17(TASE 2)与临界温度(化合物Ť ç  〜3.8 K)。从XRD和电阻率,通过优选的取向观察到错配层状化合物的各向异性。零温度极限上临界场H c2(0)和相干长度ξ通过H c2(0)  = 8.94 T和ξ  = 6.1 nm获得。电子-声子耦合常数(λ E·P  = 0.735)和比热跳跃(Δ ç é /γTÇ  〜1.4)意味着(位SnSe) 1.17(TASE 2)化合物是弱耦合常规小号-wave超导体。密度泛函理论(DFT)的计算结果表明,一些电荷从SnSe层转移到TaSe 2层。此外,体失配层(SnSe) 1.17(TaSe 2)化合物的热电性能显示出显着的各向异性。

更新日期:2021-05-14
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