Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
arXiv:2203.11566 · doi:10.7566/JPSJ.91.074706
Abstract
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.
arXiv comment15 pages, 5 figures
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