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Low-temperature properties of the dilute dipolar magnet LiHoxY1-xF4
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.ORCID iD: 0000-0003-3228-2826
2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 5Article in journal (Refereed) Published
Abstract [en]

We analyze recent experiments on the dilute rare-earth compound LiHoxY1-xF4 in the context of an effective Ising dipolar model. Using a Monte Carlo method we calculate the low-temperature behavior of the specific heat and linear susceptibility and compare our results to measurements. In our model the susceptibility follows a Curie-Weiss law at high temperature, X similar to 1 / (T- T-cw), with a Curie-Weiss temperature that scales with dilution, T-cw similar to x, consistent with early experiments. We also find that the peak in the specific heat scales linearly with dilution, C-max(T)similar to x, in disagreement with recent experiments. This difference could be caused by the hyperfine interaction which is not included in our calculation. Experimental studies do not reach a consensus on the functional form of the susceptibility and specific heat, and in particular, we do not see reported scalings of the form X similar to T-0.75 and X similar to exp(-T/T-0). Furthermore, we calculate the ground-state magnetization as a function of dilution and re-examine the phase diagram around the critical dilution x, = 0.24 +/- 0.03. We find that the spin-glass susceptibility for the Ising model does not diverge below x, while some recent experiments give strong evidence for a stable spin-glass phase in LiHo0.167Y0.833F4.

Place, publisher, year, edition, pages
2008. Vol. 78, no 5
Keyword [en]
SPIN-GLASSES
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-13942DOI: 10.1103/PhysRevB.78.054437ISI: 000259368200093Scopus ID: 2-s2.0-50449103708OAI: oai:DiVA.org:kth-13942DiVA: diva2:328505
Note
QC 20100705Available from: 2010-07-05 Created: 2010-07-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Statics, Domain Structure and Dynamics in the Dilute Dipolar Magnet LiHoF4
Open this publication in new window or tab >>Statics, Domain Structure and Dynamics in the Dilute Dipolar Magnet LiHoF4
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2009. v, 59 p.
Series
Trita-FYS, ISSN 0280-316X ; 2009:52
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-11166 (URN)978-91-7415-424-5 (ISBN)
Public defence
2009-09-25, Sal FD51, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100624Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2010-07-05Bibliographically approved

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