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Description:

We developed a sample mounting method that enables the use of a piezoelectric-based strain cell, allowing us to measure the electrical resistance of the organic conductor α-(BEDT-TTF)₂I₃ under uniaxial tensile and compressive strain. The metal-insulator (M-I) transition temperature changes with the application of uniaxial strain, exhibiting large anisotropy with respect to the strain direction. We successfully controlled the electronic states from the metallic to the insulating state by the continuous application of uniaxial strain at low temperatures. The strain dependence of the resistance and elastoresistance exhibits characteristic behavior around the M-I transition temperature. Based on previous X-ray diffraction measurements, we consider that the libration of BEDT-TTF molecules plays a crucial role in the characteristic behavior around the phase transition.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: uniaxial strain, organic conductor, charge order

Date published: 2025-05-15

Publisher: Physical Society of Japan

Journal:

• Journal of the Physical Society of Japan (ISSN: 00319015) vol. 94 issue. 5

Funding:

• JSPS 22K22444

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.7566/jpsj.94.053702

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Updated at: 2025-05-08 12:30:11 +0900

Published on MDR: 2025-05-08 12:24:20 +0900