EPR experiments in LiTb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, LiHo<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, and LiEr<mml:math xmlns:mml=

Magariño, J.; Tuchendler, J.; Beauvillain, P.; Laursen, I.

doi:10.1103/physrevb.21.18

Cited by 75 publications

(47 citation statements)

References 24 publications

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“…2 This interaction is assumed to be on-site, and its strength is characterized by the hyperfine constant, A, which is equal to 0.039 K for LiHoF 4 . 21,22,23 At low temperatures, the hyperfine interaction prefers ordering and the final phase boundary is a result of the competition between the transverse field , which tries to destroy the ferromagnetic ordering, and the hyperfine interaction.…”

Section: The Hyperfine Interactionmentioning

confidence: 99%

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Theory of the magnetic phase diagram ofLiHoF4

et al. 2004

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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 non-perturbative 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.

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Section: The Hyperfine Interactionmentioning

confidence: 99%

“…The CFPs are generally used as fitting parameters. In LiHoF 4 , for example, they are used to fit the crystal field spectrum to observed spectroscopic data, 10,22,27,28 and to susceptibility measurements. 11 In all our calculations, we use the CFPs proposed by Rønnow et al 6 Their values (in K) are listed below: …”

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confidence: 99%

Theory of the magnetic phase diagram ofLiHoF4

et al. 2004

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“…[22][23][24] The addition of these off-diagonal terms in the Hamiltonian could drive the onset of glassy behavior up to higher temperatures and extend the range of concentrations where they are visible. Moreover, the resulting compounds are in the class of mixed anisotropy systems, where rich phase diagrams including coexisting magnetic phases have been both theoretically predicted [25][26][27] and experimentally observed.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram with an enhanced spin-glass region of the mixed Ising–XYmagnet LiHoxEr1−x<

et al. 2013

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We present the experimental phase diagram of LiHo x Er 1-x F 4 , a dilution series of dipolar-coupled model magnets. The phase diagram was determined using a combination of ac susceptibility and neutron scattering. Three unique phases in addition to the Ising ferromagnet LiHoF 4 and the XY antiferromagnet LiErF 4 have been identified. Below x = 0.86, an embedded spin-glass phase is observed, where a spin glass exists within the ferromagnetic structure. Below x = 0.57, an Ising spin glass is observed consisting of frozen needlelike clusters. For x ∼ 0.3-0.1, an antiferromagnetically coupled spin glass occurs. A reduction of T C (x) for the ferromagnet is observed which disobeys the mean-field predictions that worked for LiHo x Y 1-x F 4 .

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“…Electron Paramagnetic Resonance (EPR) (12,13), susceptibility, 7 Li Nuclear Magnetic Resonance (NMR) (14) and optical spectroscopy (15) show planar XY anisotropy, but significant variation in the reported anisotropy ratio and the lack of a globally consistent set of crystal field parameters, prevented predictions of low-temperature properties. Susceptibility (16) and specific heat (17) show a transition around 380mK.…”

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confidence: 99%