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.
15 pages, 5 figures
References in corpus (13)
- Hydrogen sulphide at high pressure: a strongly-anharmonic phonon-mediated superconductor
- Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeOFBiS
- Minimal electronic models for superconducting BiS layers
- Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
- Ferroelectric Soft Phonons, Charge Density Wave Instability and Strong Electron-Phonon Coupling in BiS2-Layered Superconductors
- Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
- Charge-density wave, superconductivity and -electron valence instability in EuBiSF
- In-plane Charge Fluctuations in Bismuth Sulfide Superconductors
- Stabilization of high-Tc phase of BiS2-based superconductor LaO0.5F0.5BiS2 using high-pressure synthesis
- Evolution of Anisotropic Displacement Parameters and Superconductivity with Chemical Pressure in BiS2-Based REO0.5F0.5BiS2 (RE = La, Ce, Pr, and Nd)
- Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
- Chemical pressure effect on superconductivity of BiS2-based Ce1-xNdxO1-yFyBiS2 and Nd1-zSmzO1-yFyBiS2
- Unconventional isotope effect on transition temperature in BiS2-based superconductor Bi4O4S3