Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
J Phys Condens Matter. 2012 Feb 8;24(5):055701. doi: 10.1088/0953-8984/24/5/055701. Epub 2012 Jan 18.
We report the electrical transport, magnetic, and thermodynamic properties of polycrystalline PdTe which exhibits superconductivity below 4.5 K. Using the measured values for the lower (H(c1)) and upper (H(c2)) critical fields, and the specific heat C(p), we estimate the thermodynamic critical field H(c)(0), coherence length ξ(0), penetration depth λ(0), and the Ginzburg-Landau parameter κ. Compared with band structure calculations, the density of states at the Fermi level is enhanced due to electron-phonon coupling with λ(ep) = 1.4. Furthermore, the large values of ΔC(p)/γ(n)T(c) and 2Δ(0)/k(B)T(c) suggest that PdTe is a strongly coupled superconductor.
我们报告了多晶 PdTe 的电输运、磁和热力学性质，该材料在 4.5 K 以下表现出超导性。利用测量得到的下临界场 (H(c1)) 和上临界场 (H(c2))，以及比热 C(p)，我们估算了热力学临界场 H(c)(0)、相干长度 ξ(0)、穿透深度 λ(0) 和吉布斯-朗道参数 κ。与能带结构计算相比，由于电子-声子耦合，费米能级处的态密度增强，其中 λ(ep) = 1.4。此外，较大的 ΔC(p)/γ(n)T(c) 和 2Δ(0)/k(B)T(c) 值表明 PdTe 是一个强耦合超导体。
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