Spectroscopic investigation of holmium vanadate, HoVO<sub>4</sub>

Battison, J E; Kasten, A.; Leask, M. J. M.; Lowry, J B

doi:10.1088/0022-3719/10/2/015

Cited by 30 publications

(18 citation statements)

References 11 publications

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“…Of particular interest is the first excited state doublet Γ 1 5 at 19 • 5(3) cm −1 . Using laser spectroscopy, Battison et al . (1975Battison et al .…”

Section: The Van Vleck Paramagnet Hovomentioning

confidence: 99%

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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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“…Of particular interest is the first excited state doublet Γ 1 5 at 19 • 5(3) cm −1 . Using laser spectroscopy, Battison et al . (1975Battison et al .…”

Section: The Van Vleck Paramagnet Hovomentioning

confidence: 99%

“…Using laser spectroscopy, Battison et al . (1975Battison et al . ( , 1977 have shown that this doublet, which they place at 21 cm −1 is split with a separation of 2 • 0 cm −1 (∼60 GHz) below 20 K. This splitting might be due to a weak distortion of the tetragonal structure.…”

Section: The Van Vleck Paramagnet Hovomentioning

confidence: 99%

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

Bowden¹

1998

Aust. J. Phys.

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“…For the latter, the g-value was found by Gehring et al [38] vanadates, the crystal field in HoVO4 results in a ground state that can be represented by a non-magnetic singlet combined with an excited state doublet. The latter is placed at the crystal field state 20 cm -1 and splits below 20 K with a separation of 2 cm -1 [57,58] making from the HoVO4 a typical van Vleck paramagnet. This would explain its relatively low magnetocaloric properties as reported in Dey et al [31].…”

Section: Resultsmentioning

confidence: 99%

Comment on “Giant anisotropy of magnetocaloric effect in TbMnO3 single crystals”

et al. 2017

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It is known that the Zircon-type orthovanadates RVO4 show promise in many different applications as catalysts and optical materials. In this work, we demonstrate that the TbVO4 compound can be also used as magnetic refrigerant in efficient and ecofriendly cryocoolers due to its strong magnetocaloric effect at low temperature regime. The application of a relatively low magnetic field of 2 T along the easy magnetization axis (a) gives rise to a maximum entropy change of about 20 J/kg K at 4 K. More interestingly, under sufficiently high magnetic fields, the isothermal entropy change-ΔST remains approximately constant over a wide temperature range which is highly appreciated from a practical point of view. In the magnetic field change of 7 T,-ΔST that reaches roughly 22 J/kg K remains practically unchanged between 0 and 34 K leading to an outstanding refrigerant capacity of about 823 J/kg. On the other hand, the lowering of crystallographic symmetry from the tetragonal to the orthorhombic structure occurring close to 33 K as confirmed by Raman scattering data results in a strong magnetic anisotropy. Accordingly, strong thermal effects can be also obtained simply by spinning the TbVO4 single crystals between their hard and easy orientations in constant magnetic fields instead the standard magnetization-demagnetization process. Such rotating magnetocaloric effects would open the way for the implementation of TbVO4 in a new generation of compact and simplified magnetic refrigerators that can be dedicated to the liquefaction of hydrogen and helium.

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“…In principle, it should be possible to decide between these by calculating the energy levels and fitting them to the known experimental values. The main difficulty is that higher levels are appreciably broadened at temperatures where the populations are sufficient for optical absorption spectroscopy (Battison et al 1975(Battison et al , 1977. This gave the energies only of the lowest levels: the ground singlet, the doublet at about 21 cm-1, and a doublet at ca.…”

Section: H = Zc{ + Ze + Zm S + Zq + Zjmentioning

confidence: 99%

“…There are also more detailed nuclear orientation measurements on 166mHo (Clark et al 1987), as well as further theor etical investigations (Bleaney et al 1982;Bowden & Clark 1983). Battison et al (1977) measured the effect of applied stress on the optical adsorption spectrum; they observed that the doublet at 21 cm' 1 is not split by Blg stress along [100], but that the initial splitting was approximately doubled by B2g stress of 20 kg mm-2 along [110]. They suspected the presence of but found no evidence for a cooperative Jahn-Teller transition; however, Goto et al (1986) using acoustic measurements have observed anomalies in several of the elastic constants; the anomalies vanish at lower temperatures (approaching 1.7 K) such that the thermal population of the 21 cm-1 doublet falls to zero.…”

Section: Introductionmentioning

confidence: 99%

Further studies of the enhanced nuclear magnet HoVO ₄ - I. The crystal field and the Zeeman spectrum

Bleaney

Gregg

Hansen

et al. 1988

Proc. R. Soc. Lond. A

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A novel approach is adopted to fit the experimental results for the Van Vleck paramagnet HoVO 4 . Within the ground manifold 5 I 8 , J = 8, the five parameters for a crystal field of tetragonal symmetry are adjusted to give values in agreement with the optical spectrum for the lowest energy levels: the ground singlet, the first excited doublet at 21 cm -1 , and the (accidental) triplet at 47 cm -1 . Within experimental error (of order 1 cm -1 ), this agreement is not impaired by a small modification in which all the crystal field parameters are multiplied by a factor 1.0225. This factor is introduced to give the correct value of the enhanced nuclear magnetic resonance frequency for the stable isotope 165 Ho ( I = 7/2), known to 0.3% (Bleaney et al. Proc. R. Soc. Lond . A 362, 179 (1978)). The optical Zeeman effect, calculated therefrom, is in good agreement with that observed experimentally for the lowest levels in magnetic fields up to 15 T, directed along the [100], [110] and [001] axes (Battison et al. Phys. Lett . A 55, 173 (1975); J. Phys . C 10, 323 (1977)).

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Spectroscopic investigation of holmium vanadate, HoVO₄

Cited by 30 publications

References 11 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

Comment on “Giant anisotropy of magnetocaloric effect in TbMnO3 single crystals”

Further studies of the enhanced nuclear magnet HoVO ₄ - I. The crystal field and the Zeeman spectrum

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Spectroscopic investigation of holmium vanadate, HoVO4

Cited by 30 publications

References 11 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

Comment on “Giant anisotropy of magnetocaloric effect in TbMnO3 single crystals”

Further studies of the enhanced nuclear magnet HoVO 4 - I. The crystal field and the Zeeman spectrum

Contact Info

Product

Resources

About

Spectroscopic investigation of holmium vanadate, HoVO₄

Further studies of the enhanced nuclear magnet HoVO ₄ - I. The crystal field and the Zeeman spectrum