Dicalcium ruthenate

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Dicalcium ruthenate
Identifiers
3D model (JSmol)
  • InChI=1S/2Ca.O4Ru/c;;1-5(2,3)4/q2*+2;-4
  • Key: JWAHTWBBWFKEMH-UHFFFAOYSA-N
  • [Ca+2].[Ca+2].[O-][Ru]([O-])([O-])[O-]
Properties
Ca2O4Ru
Molar mass 245.22 g·mol−1
Related compounds
Other cations
Distrontium ruthenate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Dicalcium ruthenate, with the chemical formula Ca2RuO4, is a stochiometric oxide compound 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] Its electronic structure and also orbital magnetism are therefore subjects of experimental and theoretical scrutiny.

Contents

Electronic properties

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 has also been reported in conjunction with this c-axis compression. [5] The metal insulator transition is sensitive to electrical current. [6] [7] Below 80 K, an anti-ferromagnetic ordering emerges.

Ca1.8Sr0.2RuO4 has been proposed as a candidate system for orbital selective Mott physics. [8] The bilayer compound Ca3Ru2O7 is metallic, but display a sequence of electronic transitions below 60 K. Finally, Sr2RuO4 hosts an unconventional superconducting state. [9]

References

  1. ↑ Gorelov, E.; Karolak, M.; Wehling, T. O.; Lechermann, F.; Lichtenstein, A. I.; Pavarini, E. (2010-06-01). "Nature of the Mott Transition in Ca2RuO4". Physical Review Letters. 104 (22): 226401. arXiv: 1001.4705 . doi: 10.1103/PhysRevLett.104.226401 . ISSN   0031-9007. PMID   20867184.
  2. ↑ 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. arXiv: 1801.06215 . doi: 10.1103/PhysRevLett.121.067601 . ISSN   0031-9007. PMID   30141680.
  3. ↑ 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.
  4. ↑ 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.
  5. ↑ 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.
  6. ↑ 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.
  7. ↑ 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.
  8. ↑ 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.
  9. ↑ 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.
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