2011
DOI: 10.1088/1742-6596/324/1/012036
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Simulations of magnetic and magnetoelastic properties of Tb2Ti2O7in paramagnetic phase

Abstract: Abstract. Magnetic and magnetoelastic properties of terbium titanate pyrochlore in paramagnetic phase are simulated. The magnetic field and temperature dependences of magnetization and forced magnetostriction in Tb 2 Ti 2 O 7 single crystals and polycrystalline samples are calculated in the framework of exchange charge model of crystal field theory and a mean field approximation. The set of electron-deformation coupling constants has been determined. Variations of elastic constants with temperature and applied… Show more

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Cited by 27 publications
(26 citation statements)
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“…4,7,[14][15][16][17][18][19][20] Unfortunately, there are significant discrepancies between the published sets of crystal field parameters. These are partly caused by the fact that some of the models employ a truncated basis containing only the 13 states of the ground state 7 F 6 manifold, whereas others include all the states in the f 8 configuration of Tb 3+ .…”
Section: -10mentioning
confidence: 99%
“…4,7,[14][15][16][17][18][19][20] Unfortunately, there are significant discrepancies between the published sets of crystal field parameters. These are partly caused by the fact that some of the models employ a truncated basis containing only the 13 states of the ground state 7 F 6 manifold, whereas others include all the states in the f 8 configuration of Tb 3+ .…”
Section: -10mentioning
confidence: 99%
“…O are linear combinations of spherical tensor operators, which are similar to Stevens operators [14]. The operator H Z represents the energy of 4f electrons in an effective magnetic field, which includes fields that correspond to anisotropic exchange and magnetic dipole interactions between rare-earth ions [19], H el-def is the Hamiltonian of the electrondeformation interaction.…”
Section: Parameters Of the Crystal Fieldmentioning
confidence: 99%
“…The cooperative Jahn-Teller effect (spontaneous symmetry violation caused by interactions of rare-earth ions via fields of static and dynamic deformations) can suppress the magnetic ordering. In [10], the temperature of a possible structural phase transition was estimated to be c T  0.1 K. Previously, using a semi-phenomenological model of the crystal field, we have calculated parameters that characterize changes in the crystal field caused by macroscopic deformations of the lattice [14]. The change in the elasticity modulus C 44 of Tb 2 Ti 2 O 7 crystals in the temperature range of 100-4.2 K calculated with this set of parameters is consistent with measurement data.…”
mentioning
confidence: 99%
“…Recent studies of the crystal and magnetic excitations using polarized neutrons show that the magneto-elastic coupling plays a crucial role, yielding an interaction between the first excited crystal field level and an acoustic phonon branch, resulting in a hybrid phonon-magnon mode 4,5 . The magnetoelastic coupling also induces original properties in the pyrochlore family, such as giant magnetostriction 20,21 and very low thermal conductivity 22 . All these features suggest that the Tb 2 Ti 2 O 7 ground state is determined by an interaction between quadrupolar moments, for which a dynamical Jahn-Teller distortion could be the first (mean-field) approximation 17,23,24 .…”
mentioning
confidence: 99%