Wu, J; Nair, HP; Bollinger, AT; He, X; Robinson, I; Schreiber, NJ; Shen, KM; ... Božović, I; + view all Wu, J; Nair, HP; Bollinger, AT; He, X; Robinson, I; Schreiber, NJ; Shen, KM; Schlom, DG; Božović, I; - view fewer (2020) Electronic nematicity in Sr2RuO4. Proceedings of the National Academy of Sciences of the United States of America (PNAS) , 117 (20) pp. 10654-10659. 10.1073/pnas.1921713117.

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Abstract

We have measured the angle-resolved transverse resistivity (ARTR), a sensitive indicator of electronic anisotropy, in high-quality thin films of the unconventional superconductor Sr2RuO4 grown on various substrates. The ARTR signal, heralding the electronic nematicity or a large nematic susceptibility, is present and substantial already at room temperature and grows by an order of magnitude upon cooling down to 4 K. In Sr2RuO4 films deposited on tetragonal substrates the highest-conductivity direction does not coincide with any crystallographic axis. In films deposited on orthorhombic substrates it tends to align with the shorter axis; however, the magnitude of the anisotropy stays the same despite the large lattice distortion. These are strong indications of actual or incipient electronic nematicity in Sr2RuO4.

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