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Possible quantum nematic phase in a colossal magnetoresistance material
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Beaudin, G., Fournier, L. M., Bianchi, A. D., Nicklas, M., Kenzelmann, M., Laver, Mark and Witczak-Krempa, W. (2022) Possible quantum nematic phase in a colossal magnetoresistance material. Physical Review B (Condensed Matter and Materials Physics), 105 (3). 035104. doi:10.1103/PhysRevB.105.035104 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.105.035104
Abstract
EuB6 has for a long time captured the attention of the physics community, as it shows a ferromagnetic phase transition leading to a insulator the metal transition together with colossal magnetoresistance (CMR). EuB6 has a very low carrier density, which is known to drastically change the interaction between the localised Eu moments and the conduction electrons. One of early triumphs of the quantum theory in condensed matter was the presence of Fermi surface, which is intimately linked to the symmetry of the underlying crystal lattice. This symmetry can be probed by angle dependent magnetoresistance oscillations (AMRO) measurements. Here, we present AMRO measurements that show that in EuB6 this symmetry is broken, possibly indicating the presence of a quantum nematic phase. We identify the region in the temperature-magnetic field phase diagram where the magnetoresistance shows twofold oscillations instead of the expected fourfold pattern. Quantum nematic phases are analogous to classical liquid crystals. Like liquid crystals, which break the rotational symmetry of space, their quantum analogs break the point-group symmetry of the crystal due to strong electron-electron interactions, as in quantum Hall states, Sr3Ru2O7, and high-temperature superconductors. This is the same region where magnetic polarons were previously observed, suggesting that they drive the nematicity in EuB6. This is also the region of the phase diagram where EuB6 shows a colossal magnetoresistance (CMR). This novel interplay between magnetic and electronic properties could thus be harnessed for spintronic applications.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||||
Publisher: | American Physical Society | ||||||||
ISSN: | 1098-0121 | ||||||||
Official Date: | 15 January 2022 | ||||||||
Dates: |
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Volume: | 105 | ||||||||
Number: | 3 | ||||||||
Article Number: | 035104 | ||||||||
DOI: | 10.1103/PhysRevB.105.035104 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 15 February 2023 | ||||||||
Date of first compliant Open Access: | 15 February 2023 |
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