Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-23
Physics
Condensed Matter
Strongly Correlated Electrons
31 pages, including 3 figures and supplement with 3 more figures
Scientific paper
Emergent magnetic monopoles have recently been identified in many condensed-matter systems. In particular, experiments on dipolar spin ice have established a magnetic Coulomb phase where monopoles interact through a magnetic Coulomb interaction. With quantum-mechanical interactions, these magnetic charges can be carried by fractionalized bosonic quasi-particles, spinons, which can undergo Bose-Einstein condensation via the Higgs mechanismHere, we report evidence of a transition from a magnetic Coulomb liquid to a ferromagnet in single-crystal Yb_2Ti_2O_7. Polarised neutron-scattering experiments show that the diffuse [111]-rod scattering whose intensity grows with decreasing temperature is suddenly suppressed below T_C ~ 0.21 K, where magnetic Bragg peaks and a full depolarisation of neutron spins are observed with thermal hysteresis, indicating a first-order ferromagnetic transition. Our results are explained from a quantum spin-ice modelwhose high-temperature phase belongs to the magnetic Coulomb phase, while the ground state shows a nearly collinear ferromagnetism with gapped spin excitations.
Chang Lieh-Jeng
Kakurai Kazuhisa
Kao Ying-Jer
Lees Martin Richard
Onoda Shigeki
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