Higgs transition from a magnetic Coulomb liquid to a ferromagnet in Yb2Ti2O7

被引：171

作者：

Chang, Lieh-Jeng ^{[1
,2
]}

Onoda, Shigeki ^{[3
]}

Su, Yixi ^{[4
]}

Kao, Ying-Jer ^{[5
,6
]}

Tsuei, Ku-Ding ^{[7
]}

Yasui, Yukio ^{[8
,9
]}

Kakurai, Kazuhisa ^{[2
]}

Lees, Martin Richard ^{[10
]}

机构：

[1] Natl Cheng Kung Univ, Dept Phys, Tainan 70101, Taiwan

[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

[3] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan

[4] Julich Ctr Neutron Sci JCNS FRM II, Forschungszentrum Julich, Outstn FRM 2, D-85747 Garching, Germany

[5] Natl Taiwan Univ, Dept Phys, Taipei 10607, Taiwan

[6] Natl Taiwan Univ, Ctr Adv Study Theoret Sci, Taipei 10607, Taiwan

[7] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[8] Nagoya Univ, Div Mat Sci, Dept Phys, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[9] Meiji Univ, Dept Phys, Kawasaki, Kanagawa 2148571, Japan

[10] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

NATURE COMMUNICATIONS | 2012年 / 3卷

基金：

日本学术振兴会;

关键词：

PYROCHLORES; MONOPOLES; PHASE;

D O I：

10.1038/ncomms1989

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：7

共 40 条

[1] PLASMONS, GAUGE INVARIANCE, AND MASS [J].