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Higgs transition from a magnetic Coulomb liquid to a ferromagnet in Yb2Ti2O7
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Chang, Lieh-Jeng, Onoda, Shigeki, Su, Yixi, Kao, Ying-Jer, Tsuei, Ku-Ding, Yasui, Yukio, Kakurai, Kazuhisa and Lees, Martin R. (2012) Higgs transition from a magnetic Coulomb liquid to a ferromagnet in Yb2Ti2O7. Nature Communications, Vol.3 . Article no. 992. doi:10.1038/ncomms1989 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/ncomms1989
Abstract
In a class of frustrated magnets known as spin ice, magnetic monopoles emerge as classical defects and interact via the magnetic Coulomb law. With quantum-mechanical interactions, these magnetic charges are carried by fractionalized bosonic quasi-particles, spinons, which can undergo Bose-Einstein condensation through a first-order transition via the Higgs mechanism. Here, we report evidence of a Higgs transition from a magnetic Coulomb liquid to a ferromagnet in single-crystal Yb2Ti2O7. Polarized neutron scattering experiments show that the diffuse [111]-rod scattering and pinch-point features, which develop on cooling are suddenly suppressed below T-C similar to 0.21 K, where magnetic Bragg peaks and a full depolarization of the neutron spins are observed with thermal hysteresis, indicating a first-order ferromagnetic transition. Our results are explained on the basis of a quantum spin-ice model, whose hightemperature phase is effectively described as a magnetic Coulomb liquid, whereas the ground state shows a nearly collinear ferromagnetism with gapped spin excitations.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Nature Communications | ||||
Publisher: | Nature Publishing Group | ||||
ISSN: | 2041-1723 | ||||
Official Date: | August 2012 | ||||
Dates: |
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Volume: | Vol.3 | ||||
Page Range: | Article no. 992 | ||||
DOI: | 10.1038/ncomms1989 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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