论文标题
基于BIS2的分层超导体RE（O，F）BIS2（RE = LA，CE，PR，ND）
Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
论文作者
论文摘要
我们研究了Grüneisen参数（γG），以研究基于分层BIS2的超导体系统REO1-XFXBIS2（RE = LA，CE，CE，PR，ND）中的晶格非谐度，其中平面化学压由代替RE元素调节。随着面内化学压的增加，大量模量显着增加，并且在RE = ND中观察到高γG。 γG对平面化学压力的依赖性与TC具有良好的相关性，并且当γG大于RE = ND时，可以达到更高的TC。另外，γG在REO1-XFXBIS2中的F浓度（X）的降低显示出略有降低。我们的结果表明，REO1-XFXBIS2中存在BI沿C轴的非谐波振动，并且对超导TC和配对机制的超导性增强与超导性的增强相关。
We studied Grüneisen parameter (γG) to investigate lattice anharmonicity in a layered BiS2-based superconductor system REO1-xFxBiS2 (RE = La, Ce, Pr, Nd), where in-plane chemical pressure was tuned by substituting the RE elements. With increasing in-plane chemical pressure, bulk modulus remarkably increases, and a high γG is observed for RE = Nd. The dependence of γG on in-plane chemical pressure exhibits a good correlation with Tc, and a higher Tc is achieved when γG is large for RE = Nd. In addition, γG shows a slight decrease by a decrease of F concentration (x) in REO1-xFxBiS2. Our results show that the anharmonic vibration of Bi along the c-axis is present in REO1-xFxBiS2, and the enhancement of the anharmonicity is positively linked to superconducting Tc and pairing mechanisms.
