Absorption and Fluorescence Spectra of Tm3+ in YVO4 and YPO4

Knoll, Kevin

doi:10.1002/pssb.2220450218

Cited by 73 publications

(16 citation statements)

References 23 publications

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“…From EPR studies on dilute Tm 3+ in YVO 4 , it is known that the ground state of the Tm 3+ ion is a degenerate (non-Kramers) doublet with a singlet state some 53 • 8 cm −1 above the ground state (Knoll 1971). The ground state is predominantly |J z = ± 5 , with a g || of 9 • 96.…”

Section: Antiferromagnetic Tmvomentioning

confidence: 99%

A Review of the Low Temperature Properties of the Rare Earth Vanadates

Bowden¹

1998

Aust. J. Phys.

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The rare earth vanadates have long been studied for their interesting magnetic properties and cooperative Jahn–Teller distortions. In the main, most of this work has been carried out at temperatures down to 1 K or so (e.g. Gehring and Gehring 1975). In this review NMRON, and other low temperature experiments in the mK regime, are presented and discussed. It will be argued that the low temperature properties of these compounds are just as interesting as their high temperature counterparts. In general, the nuclear and electronic wavefunctions become intermixed, leading to a variety of interesting physical effects, such as enhanced nuclear magnetism, quadrupolar induced intermediate state re-orientation etc. These effects have, in turn, spawned new methods for the investigation of magnetic structures, and thermometric detection of NMR both by internal and external thermometers. Several experiments are suggested, including magnetic refrigeration, Mössbauer, EPR in the ≈30 GHz range, in addition to thermometric NMR and NMRON.

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Section: Antiferromagnetic Tmvomentioning

confidence: 99%

A Review of the Low Temperature Properties of the Rare Earth Vanadates

Bowden¹

1998

Aust. J. Phys.

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“…The Tm ions (4f 12 with L = 5, S = 1, J = 6) in this material have partially filled 4f shells that are split by a tetragonal crystal field. The ground state doublet is well separated by a gap of ∼ 77 K to the lowest excited state [16]. Importantly, the ground state is a non-Kramers doublet, such that the first or-der Zeeman interaction vanishes for in-plane fields (i.e.…”

Section: Introductionmentioning

confidence: 99%

Second order Zeeman interaction and ferroquadrupolar order in TmVO$_4$

Vinograd,

Shirer,

Massat

et al. 2021

Preprint

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TmVO4 exhibits ferroquadrupolar order of the Tm 4f electronic orbitals at low temperatures, and is a model system for Ising nematicity that can be tuned continuously to a quantum phase transition via magnetic fields along the c-axis. Here we present 51 V nuclear magnetic resonance data in magnetic fields perpendicular to the c-axis in a single crystal that has been carefully cut by a plasma focused ion beam to an ellipsoidal shape to minimize the inhomogeneity of the internal demagnetization field. The resulting dramatic increase in spectral resolution enabled us to resolve the anisotropy of the electric field gradient and to measure the magnetic and quadrupolar relaxation channels separately. Perpendicular magnetic fields nominally do not couple to the low energy degrees of freedom, but we find a significant nonlinear contribution for sufficiently large fields that give rise to a rich phase diagram. The in-plane magnetic field can act either as an effective transverse or longitudinal field to the Ising nematic order, depending on the orientation relative to the principle axes of the quadrupole order, and leads to a marked in-plane anisotropy in both relaxation channels. We find that the small in-plane transverse fields initially enhance the ferroquadrupolar ordering temperature but eventually suppress the long-range order. We tentatively ascribe this behavior to the competing effects of field-induced mixing of higher energy crystal field states and the destabilizing effects of field-induced quantum fluctuations.

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“…It is this degeneracy that drives the FQ phase transition. The first excited CEF state is 54 cm −1 (6.7 meV) above the ground state doublet [17], so at low temperatures the system can be described in terms of a pseudo-spin to a very good approximation. Below T Q , the material develops spontaneous xy strain, corresponding to a nematic order parameter that transforms as the B 2g irreducible representation of the point group of the tetragonal crystal lattice.…”

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confidence: 99%

Field-tuned ferroquadrupolar quantum phase transition in the insulator TmVO$_{4}$

Massat,

Wen,

Jiang

et al. 2021

Preprint

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We report results of low-temperature heat capacity, magnetocaloric effect and neutron diffraction measurements of TmVO4, an insulator that undergoes a continuous ferroquadrupolar phase transition associated with local partially-filled 4f orbitals of the thulium (Tm 3+ ) ions. The ferroquadrupolar transition, a realization of Ising nematicity, can be tuned to a quantum critical point using a magnetic field oriented along the c-axis of the tetragonal crystal lattice, which acts as an effective transverse field for the Ising-nematic order. In small magnetic fields, the thermal phase transition can be well-described using a semi-classical mean field treatment of the transverse field Ising model. However, in higher magnetic fields, closer to the field-tuned quantum phase transition, subtle deviations from this semi-classical behavior are observed due to quantum fluctuations. Although the phase transition is driven by the local 4f degrees of freedom, the crystal lattice still plays a crucial role, both in terms of mediating the interactions between the local quadrupoles, and in determining the critical scaling exponents, even though the phase transition itself can be described via mean field. In particular, bilinear coupling of the nematic order parameter to acoustic phonons changes the spatial and temporal fluctuations of the former in a fundamental way, resulting in different critical behavior of the nematic transverse-field Ising model as compared to the usual case of the magnetic transverse-field Ising model. Our results establish TmVO4 as a model material, and electronic nematicity as a paradigmatic example, for quantum criticality in insulators.

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Absorption and Fluorescence Spectra of Tm³⁺ in YVO₄ and YPO₄

Cited by 73 publications

References 23 publications

A Review of the Low Temperature Properties of the Rare Earth Vanadates

A Review of the Low Temperature Properties of the Rare Earth Vanadates

Second order Zeeman interaction and ferroquadrupolar order in TmVO$_4$

Field-tuned ferroquadrupolar quantum phase transition in the insulator TmVO$_{4}$

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