Dicalcium ruthenate
Dicalcium ruthenate, with the chemical formula Ca2RuO4, is a stochiometric oxide compound Ca2RuO4 that hosts a multi-orbital (band) Mott insulating ground state. For this reason, Ca2RuO4 serves as an important "meeting-point" between conceptual developments[1][2] of strongly correlated multi-band physics and advanced experimental spectroscopies.[3][4] Electronic structure but also orbital magnetism is therefore the subject experimental and theoretical scrutiny.
Electronic properties
[edit]Around 350 K, Ca2RuO4 undergoes a metal insulator transition which involves a crystal structure transition leading to a strong c-axis compression. Negative thermal expansion as also been reported in conjunction to this c-axis compression.[5] The metal insulator transition is sensitive to electrical current.[6][7] Below 80 K, an anti-ferromagnetic ordering emerges.
Related materials
[edit]Ca1.8Sr0.2RuO4 has been proposed as a candidate system of orbital selective Mott physics.[8] The bilayer compound Ca3Ru2O7 is metallic but display a sequence of electronic transitions below 60 K. Finally, Sr2RuO4 host an unconventional superconducting state.[9]
References
[edit]- ^ Gorelov, E.; Karolak, M.; Wehling, T. O.; Lechermann, F.; Lichtenstein, A. I.; Pavarini, E. (2010-06-01). "Nature of the Mott Transition in Ca 2 RuO 4". Physical Review Letters. 104 (22): 226401. arXiv:1001.4705. doi:10.1103/PhysRevLett.104.226401. ISSN 0031-9007. PMID 20867184.
- ^ Han, Qiang; Millis, Andrew (2018-08-08). "Lattice Energetics and Correlation-Driven Metal-Insulator Transitions: The Case of Ca2RuO4". Physical Review Letters. 121 (6): 067601. doi:10.1103/PhysRevLett.121.067601. ISSN 0031-9007. PMID 30141680.
- ^ Jain, A.; Krautloher, M.; Porras, J.; Ryu, G. H.; Chen, D. P.; et al. (2017-03-27). "Higgs mode and its decay in a two-dimensional antiferromagnet". Nature Physics. 13 (7). Springer Science and Business Media LLC: 633–637. arXiv:1705.00222. Bibcode:2017NatPh..13..633J. doi:10.1038/nphys4077. ISSN 1745-2473.
- ^ Sutter, D.; Fatuzzo, C. G.; Moser, S.; Kim, M.; Fittipaldi, R.; et al. (2017-05-05). "Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4" (PDF). Nature Communications. 8 (1). Springer Science and Business Media LLC: 15176. doi:10.1038/ncomms15176. ISSN 2041-1723. PMC 5424259. PMID 28474681.
- ^ Takenaka, Koshi; Okamoto, Yoshihiko; Shinoda, Tsubasa; Katayama, Naoyuki; Sakai, Yuki (2017-01-10). "Colossal negative thermal expansion in reduced layered ruthenate" (PDF). Nature Communications. 8 (1): 14102. Bibcode:2017NatCo...814102T. doi:10.1038/ncomms14102. ISSN 2041-1723. PMC 5234094. PMID 28071647.
- ^ Curcio, Davide; Sanders, Charlotte E.; Chikina, Alla; Lund, Henriette E.; Bianchi, Marco; et al. (2023-10-16). "Current-driven insulator-to-metal transition without Mott breakdown in Ca 2 RuO 4". Physical Review B. 108 (16). arXiv:2303.00662. doi:10.1103/PhysRevB.108.L161105. ISSN 2469-9950.
- ^ Suen, C. T.; Marković, I.; Zonno, M.; Heinsdorf, N.; Zhdanovich, S.; et al. (2024). "Electronic response of a Mott insulator at a current-induced insulator-to-metal transition". Nature Physics. 20 (11): 1757–1763. arXiv:2308.05803. Bibcode:2024NatPh..20.1757S. doi:10.1038/s41567-024-02629-3. ISSN 1745-2473.
- ^ Koga, Akihisa; Kawakami, Norio; Rice, T. M.; Sigrist, Manfred (2004-05-28). "Orbital-Selective Mott Transitions in the Degenerate Hubbard Model". Physical Review Letters. 92 (21): 216402. arXiv:cond-mat/0401223. Bibcode:2004PhRvL..92u6402K. doi:10.1103/PhysRevLett.92.216402. ISSN 0031-9007. PMID 15245300.
- ^ Mackenzie, Andrew Peter; Maeno, Yoshiteru (2003-05-01). "The superconductivity of Sr 2 RuO 4 and the physics of spin-triplet pairing". Reviews of Modern Physics. 75 (2): 657–712. doi:10.1103/RevModPhys.75.657. ISSN 0034-6861.
 | This physics-related article is a stub. You can help Wikipedia by expanding it. |