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Collective phenomena in the LiHo xY 1-xF 4 quantum ising magnet: Recent progress and open questions
KTH, School of Engineering Sciences (SCI), Theoretical Physics.ORCID iD: 0000-0003-3228-2826
2011 (English)In: Journal of Physics: Conference Series, ISSN 1742-6588, Vol. 320, 012001- p.Article in journal (Refereed) Published
Abstract [en]

In LiHo xY 1-xF 4, the magnetic Holmium Ho 3+ ions behave as effective Ising spins that can point parallel or antiparallel to the crystalline c-axis. The predominant inter-Ho 3+ interaction is dipolar, while the Y 3+ ions are non-magnetic. The application of a magnetic field B x transverse to the c-axis Ising direction leads to quantum spin-flip fluctuations, making this material a rare physical realization of the celebrated transverse field Ising model. The problems of classical and transverse-field-induced quantum phase transitions in LiHo xY 1-xF 4 in the dipolar ferromagnetic (x = 1), diluted ferromagnetic (0.25 ≤∼ x < 1) and highly diluted x ≤∼ 0.25 dipolar spin glass regimes have attracted much experimental and theoretical interest over the past twenty-five years. Two questions have received particular attention: (i) is there an antiglass (quantum disordered) phase at low Ho 3+ concentration and (ii) what is the mechanism responsible for the fast B x-induced destruction of the ferromagnetic (0.25 ≤∼ x < 1) and spin glass (x ≤∼ 0.25) phases? This paper reviews some of the recent theoretical and experimental progress in our understanding of the collective phenomena at play in LiHo xY 1-xF 4, in both zero and nonzero B x.

Place, publisher, year, edition, pages
2011. Vol. 320, 012001- p.
Keyword [en]
Collective phenomena, Ising spins, Nonmagnetics, Physical realization, Quantum phase transitions, Recent progress, Spin-flip, Transverse-field Ising model, Ferromagnetic materials, Ferromagnetism, Glass, Holmium, Ising model, Magnetic fields, Solids, Spin fluctuations, Spin glass, Quantum theory
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-150675DOI: 10.1088/1742-6596/320/1/012001ISI: 000299350600001ScopusID: 2-s2.0-81055125404OAI: diva2:744937
International Conference on Frustration in Condensed Matter, ICFCM; Sendai; Japan; 11-14 January 2011

QC 20140909

Available from: 2014-09-09 Created: 2014-09-08 Last updated: 2015-10-09Bibliographically approved

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