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We studied Gr\"uneisen parameter ({\gamma}G) to investigate latticeanharmonicity in a layered BiS2-based superconductor system REO1-xFxBiS2 (RE =La, Ce, Pr, Nd), where in-plane chemical pressure was tuned by substituting theRE elements. With increasing in-plane chemical pressure, bulk modulusremarkably increases, and a high {\gamma}G is observed for RE = Nd. Thedependence of {\gamma}G on in-plane chemical pressure exhibits a goodcorrelation with Tc, and a higher Tc is achieved when {\gamma}G is large for RE= Nd. In addition, {\gamma}G shows a slight decrease by a decrease of Fconcentration (x) in REO1-xFxBiS2. Our results show that the anharmonicvibration of Bi along the c-axis is present in REO1-xFxBiS2, and theenhancement of the anharmonicity is positively linked to superconducting Tc andpairing mechanisms.

Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)