Effect of intrinsic quantum fluctuations on the phase diagram of anisotropic dipolar magnets

Tomer Dollberg, Juan Carlos Andresen, Moshe Schechter

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The rare-earth material LiHoF4 is believed to be an experimental realization of the celebrated (dipolar) Ising model and, upon the inclusion of a transverse field Bx, an archetypal quantum Ising model. Moreover, by substituting the magnetic Ho ions by nonmagnetic Y ions, disorder can be introduced into the system, giving rise to a dipolar disordered magnet and at high disorders to a spin glass. Indeed, this material has been scrutinized experimentally, numerically, and theoretically over many decades with the aim of understanding various collective magnetic phenomena. One of the to-date open questions is the discrepancy between the experimental and theoretical Bx-T phase diagram at low fields and high temperatures. Here we propose a mechanism, backed by numerical results, that highlights the importance of quantum fluctuations induced by the off-diagonal dipolar terms, in determining the critical temperature of anisotropic dipolar magnets in the presence and in the absence of a transverse field. We thus show that the description as a simple Ising system is insufficient to quantitatively describe the full phase diagram of LiHoF4, for the pure as well as for the dilute system.

Original languageEnglish
Article numberL180412
JournalPhysical Review B
Issue number18
StatePublished - 1 May 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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