Relationship between Resistivity Anomaly and Crystal Structure Parameters in Pb Substituted La(O,F)BiS2

We investigated the anomaly observed in the electrical resistivity in Pb substituted La(O,F)BiS2, focusing on the crystal-structure parameters. The polycrystalline LaO0.4F0.6Bi1−xPbxS2 showed that the lattice constant along the c-axis decreased at 300 K at x ≥ 0.11 owing to the shrinkage of a Bi–Bi...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Physical Society of Japan 2024-06, Vol.93 (6), p.1
Main Authors: Okada, Sho, Demura, Satoshi, Takano, Yoshiki
Format: Article
Language:English
Subjects:
Crystal structure
Electrical resistivity
High temperature
Lattice parameters
Lead
Phase transitions
Room temperature
Substitutes
Superconductivity
Superconductors
Symmetry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigated the anomaly observed in the electrical resistivity in Pb substituted La(O,F)BiS2, focusing on the crystal-structure parameters. The polycrystalline LaO0.4F0.6Bi1−xPbxS2 showed that the lattice constant along the c-axis decreased at 300 K at x ≥ 0.11 owing to the shrinkage of a Bi–Bi plane distance. Among them, the crystal structure at x = 0.11 transformed to one with low symmetry at 100 K. The x ≥ 0.18 samples exhibited the structure at room temperature. These samples with x ≥ 0.11 showed the anomaly at approximately 150 to 350 K as well as enhanced superconducting properties compared with x < 0.11. The temperature at which the anomaly appeared increased with increasing Pb concentration. From these results, we found that the Pb substitution induced the compression of the Bi–Bi plane distance. Furthermore, this compression triggered a structural phase transition to a low-symmetry-crystal structure, resulting in anomalous electrical resistivity and enhanced superconducting properties. In addition, an increase in Pb concentration stabilized the low-symmetry-crystal structure at high temperature. These results lead to the elucidation of the relationship between the structure and superconductivity in BiCh2-based superconductors.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.93.064701