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- W1904349711 abstract "Models for the spin systems in LiHoF4 and the randomly diluted spin system LiHo0.3Y0.7F4 are investigated by a Monte Carlo simulation. The models are described by long-range dipolar Hamiltonians. The experimentally observed ferromagnetic ground state for LiHoF4 is reproduced in the simulations provided the 'sample' is of prolate ellipsoidal shape with an axis ratio of four or more. The transition temperature Tc(L)-where L is an effective length-is obtained from the position of the maximum of the heat capacity for a number of sample sizes. The critical temperature, Tc(L= infinity ), obtained by extrapolation of Tc(L), is in fair agreement with the experimentally observed critical temperature. The randomly diluted spin systems are obtained by removing spins from the undiluted sample. Two different dilution methods are considered. Both produce an incompletely ordered ferromagnetic ground state in agreement with experiment. Comparison with simulations on a modified long-range model indicates that the absence of a perfect ferromagnetic ground state is due to frustration effects inherent in the dipolar Hamiltonian. The estimates for the zero-temperature magnetisation and the critical-temperature depression agree with the experimental results. Some simulations that include a magnetic field along the c axis have also been performed on the diluted spin system. The results show that the ferromagnetic ground state is obtained for a sufficiently strong magnetic field. Experiments to test this prediction are suggested." @default.
- W1904349711 created "2016-06-24" @default.
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- W1904349711 date "1989-04-03" @default.
- W1904349711 modified "2023-10-16" @default.
- W1904349711 title "Dipolar spin systems: models for LiHoF<sub>4</sub>and LiHo<sub>0.3</sub>Y<sub>0.7</sub>F<sub>4</sub>" @default.
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- W1904349711 doi "https://doi.org/10.1088/0953-8984/1/13/009" @default.
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