Nickelate superconductors: multiorbital nature and spin freezing
- Werner, Philipp Department of Physics, University of Fribourg, Switzerland
- Hoshino, Shintaro Department of Physics, Saitama University, Japan
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07.01.2020
Published in:
- Physical Review B. - 2020, vol. 101, no. 4, p. 041104
English
Superconductivity with a remarkably high Tc has recently been found in Sr-doped NdNiO2 thin films. While this system bears strong similarities to the cuprates, some differences, such as a weaker antiferromagnetic exchange coupling and possible high-spin moments on the doped Ni sites have been pointed out. Here, we investigate the effect of Hund coupling and crystal field splitting in a simple model system and argue that a multiorbital description of nickelate superconductors is warranted, especially in the strongly hole-doped regime. We then look at this system from the viewpoint of the spin-freezing theory of unconventional superconductivity, which provides a unified understanding of unconventional superconductivity in a broad range of compounds. Nd0.8Sr0.2NiO2 falls into a parameter regime influenced by two spin- freezing crossovers; one related to the emergent multiorbital nature in the strongly doped regime and the other related to the single-band character and square lattice geometry in the weakly doped regime.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
-
- English
- Classification
- Physics
- License
- License undefined
- Identifiers
-
- RERO DOC 328235
- DOI 10.1103/PhysRevB.101.041104
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308371
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