Control of Physical Properties of Iron-Based Superconductors via Biaxial Strain

Application of strain is one of the effective ways to tailor physical properties of materials through the control of the band structure. In this article, a focus is on biaxial strain applied on single-crystalline samples. Transport measurements were performed on FeSe single crystals with various degrees of in-plane biaxial strain, which was introduced by firmly gluing samples to various substrate materials with different thermal expansion. The analysis of magnetotransport results revealed a systematic change in the carrier density with strain. This indicates that the band structure of FeSe single crystals was definitely controlled by biaxial strain.