Jiao Wen-He, He Lan-Po, Liu Yi, Xu Xiao-Feng, Li Yu-Ke, Zhang Chu-Hang, Zhou Nan, Xu Zhu-An, Li Shi-Yan, Cao Guang-Han
Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China.
State Key Laboratory of Surface Physics, Department of Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China.
Sci Rep. 2016 Feb 15;6:21628. doi: 10.1038/srep21628.
We report bulk superconductivity at 1.0 K in a low-dimensional ternary telluride Ta3Pd3Te14 containing edge-sharing PdTe2 chains along crystallographic b axis, similar to the recently discovered superconductor Ta4Pd3Te16. The electronic heat capacity data show an obvious anomaly at the transition temperature, which indicates bulk superconductivity. The specific-heat jump is ΔC/(γ(n)T(c)) ≈ 1.35, suggesting a weak coupling scenario. By measuring the low-temperature thermal conductivity, we conclude that Ta3Pd3Te14 is very likely a dirty s-wave superconductor. The emergence of superconductivity in Ta3Pd3Te14 with a lower T(c), compared to that of Ta4Pd3Te16, may be attributed to the lower density of states.
我们报道了一种低维三元碲化物Ta3Pd3Te14在1.0 K时出现体超导现象，该化合物沿晶体学b轴包含边共享的PdTe2链，类似于最近发现的超导体Ta4Pd3Te16。电子比热数据在转变温度处显示出明显的异常，这表明存在体超导。比热跃变ΔC/(γ(n)T(c)) ≈ 1.35，表明是弱耦合情况。通过测量低温热导率，我们得出Ta3Pd3Te14很可能是一种脏s波超导体。与Ta4Pd3Te16相比，Ta3Pd3Te14具有更低的临界温度，其超导性的出现可能归因于更低的态密度。
