National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Phys Rev Lett. 2010 Jan 8;104(1):017003. doi: 10.1103/PhysRevLett.104.017003.
By realizing in thin films a tensile stress state, superconductivity of 13 K was introduced into FeTe, a nonsuperconducting parent compound of the iron pnictides and chalcogenides, with a transition temperature higher than that of its superconducting isostructural counterpart FeSe. For these tensile stressed films, superconductivity is accompanied by a softening of the first-order magnetic and structural phase transition, and also, the in-plane extension and out-of-plane contraction are universal in all FeTe films independent of the sign of the lattice mismatch, either positive or negative. Moreover, the correlations were found to exist between the transition temperatures and the tetrahedra bond angles in these thin films.
通过在薄膜中实现拉伸应力状态，将 13K 的超导性引入到铁的磷化物和硫属化物的非超导母体化合物 FeTe 中，其转变温度高于其超导同构对应物 FeSe。对于这些受拉伸应力的薄膜，超导伴随着一阶磁结构相变的软化，并且，在面内拉伸和面外收缩在所有 FeTe 薄膜中是普遍存在的，与晶格失配的符号无关，无论是正的还是负的。此外，还发现这些薄膜的转变温度与四面体键角之间存在相关性。
