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Theory of the magnetic phase diagram of LiHoF4
KTH, Superseded Departments, Physics.ORCID iD: 0000-0003-3228-2826
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2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 14Article in journal (Refereed) Published
Abstract [en]

The properties of LiHoF4 are believed to be well described by a long-range dipolar Ising model. We go beyond mean-field theory and calculate the phase diagram of the Ising model in a transverse field using a quantum Monte Carlo method. The relevant Ising degrees of freedom are obtained using a nonperturbative projection onto the low-lying crystal-field eigenstates. We explicitly take the domain structure into account, and the strength of the near-neighbor exchange interaction is obtained as a fitting parameter. The on-site hyperfine interaction is approximately taken into account through a renormalization of the transverse applied magnetic field. Finally, we propose a spectroscopy experiment to precisely measure the most important parameter controlling the location of the phase boundary.

Place, publisher, year, edition, pages
2004. Vol. 70, no 14
Keyword [en]
lithium holmium fluoride, monte-carlo simulations, dipolar interactions, disordered magnet, critical-behavior, spin systems, ferromagnetism, lierf4, transition, models
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-23855DOI: 10.1103/PhysRevB.70.144411ISI: 000224855600050ScopusID: 2-s2.0-42749098968OAI: diva2:342554
QC 20100525 QC 20110922Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-22Bibliographically approved

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