AI Article Synopsis
- Researchers are investigating the unique superconducting properties of LiTiO, the only oxide superconductor with a spinel structure, due to frustrations in its mixed-valence state.
- They discovered a distinct fourfold rotational symmetry in the superconductivity of high-quality LiTiO(001) thin films, which exhibited oscillations in magnetoresistivity and upper critical fields under a magnetic field while in the superconducting state.
- The observed behavior is linked to unconventional -wave Cooper pairing, indicating a complex pairing interaction in this three-dimensional spinel oxide superconductor.
Article Abstract
The charge frustration with the mixed-valence state inherent to LiTiO, which is found to be the only oxide superconductor with spinel structure, is the impetus for paying special attention to unveil the underlying intriguing superconducting properties. Here, we report a pronounced fourfold rotational symmetry of the superconductivity in high-quality single-crystalline LiTiO(001) thin films. Both the magnetoresistivity and upper critical field under an applied magnetic field manifest striking fourfold oscillations deep inside the superconducting state, whereas the anisotropy vanishes in the normal state, demonstrating that it is an intrinsic property of the superconducting phase. We attribute this behavior to the unconventional -wave superconducting Cooper pairs with the irreducible representation of E protected by the O point group in cubic LiTiO. Our findings show the nontrivial character of the pairing interaction in a three-dimensional spinel oxide superconductor.
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| http://dx.doi.org/10.1021/acsnano.2c09338 | DOI Listing |
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