Hyperfine interactions of 161Dy in dysprosium pyrogermanate at low temperature

Sengupta, A.; Ghosh, D.

doi:10.1016/0022-3697(94)00118-9

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…This is in good agreement with both the integrated entropy data discussed above and shown in Fig. 2(a), and previous theoretical predictions that the low temperature ground state of the Dy 2 Ge 2 O 7 is a Kramers doublet separated by about 161 K from the first excited state due to the strong crystal electric field [12,16].…”

Section: Measurements Of the Isothermal Magnetization As A Function Osupporting

confidence: 80%

“…Rare-earth based pyrogermanates (Ln 2 Ge 2 O 7 ), with a similar chemical formula, but a different structure from the pyrochlores, have also attracted considerable attention [11,12,13,14,15,16,17]. Instead of having a cubic pyrochlore structure with a sublattice of magnetic corner-sharing tetrahedra, rare-earth pyrogermanates are reported to have either triclinic (for Ln = La, Pr, or Nd-Gd), tetragonal (for Ln = Gd-Lu), or monoclinic structures (Sc 2 Ge 2 O 7 ) [11].…”

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confidence: 99%

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Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Dahlberg

Morosan

et al. 2008

Phys. Rev. B

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We report systematic low temperature measurements of the DC magnetization, AC susceptibility, and heat capacity of dysprosium pyrogermanate (Dy 2 Ge 2 O 7 ) single crystal and powder samples. Our results confirm that Dy 2 Ge 2 O 7 is an anisotropic antiferromagnet. The isothermal field dependent magnetization and the integrated magnetic entropy both indicate that the Dy 3+ ions behave as Ising-like spins, analogous to those in the pyrochlore spin ice materials. Both single-spin and collective spin relaxation phenomena appear to lead to spin freezing in this material, again in analogy to observations in the spin ice materials, suggesting that such phenomena may be generic to a broader class of magnetic materials.

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Section: Measurements Of the Isothermal Magnetization As A Function Osupporting

confidence: 80%

mentioning

confidence: 99%

Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Dahlberg

Morosan

et al. 2008

Phys. Rev. B

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“…Consequently the crystal field (CF) produced by the anionic oxygens at the R 3+ cationic site has D 5h point symmetry, the axis of which nearly coincides (∼5 • off) with the tetragonal (D 4 4 ) c-axis. For this reason experimental studies and CF analysis of the data of the spectral and magnetic properties of these RPG crystals are quite convenient and accurate, as was demonstrated earlier from the studies of (i) circular dichroism (CD) spectra of ErPG [9], TmPG and TbPG [10] and GdPG [11]; (ii) optical absorption spectra of ErPG and DyPG [12,13], GdPG [14] and TmPG [15]; (iii) magnetic susceptibilities and anisotropies of TmPG [16], DyPG [17], HoPG [18], ErPG [19] and GDPG [14]; (iv) nuclear hyperfine effects in TmPG [20] and DyPG [21].…”

Section: Introductionmentioning

confidence: 70%

Optical absorption spectra of doped in yttrium pyrogermanate crystal

Das¹,

Ghosh²,

Wanklyn³

1999

J. Phys.: Condens. Matter

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This paper reports the low temperature absorption and Zeeman spectra of doped in yttrium pyrogermanate (YPG), which were studied for the first time. In this compound the site symmetry of , or the crystal field (CF) symmetry, was found to be , as present in other rare earth pyrogermanates, and not . The spectral results were analysed by diagonalizing the total Hamiltonian consisting of the atomic (electrostatic, spin-orbit and configuration interactions) and the CF interactions, in a basis of states spanning the entire ground configuration of in the intermediate coupling formalism, including J-mixing under CF. The best fitted free ion and CF parameters obtained were and (all in ). Using these parameters the thermal characteristics of molar magnetic susceptibilities , their anisotropy and the Schottky specific heat of in YPG were calculated. It was found that the calculated values of between 300 and 152 K but on cooling further was observed, i.e. the sign of was reversed below . The calculated values of exhibited a sharp peak at 24 K and a broad maximum at 156 K. These characteristics were similar to other compounds studied earlier.

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“…Finally we stress that the major emphasis of the present investigation is to demonstrate that one has to use the complete basis in contrast to the partial basis as is customary with magnetic workers [16][17][18][19][20][21] and diagonalize the energy matrix incorporating all the interactions simultaneously. This is necessary to get the correct set of parameters as has already been shown by us for other system [8].…”

Section: Resultsmentioning

confidence: 99%

Crystal Field Theory of Magnetic Behaviour of Er₂(SO₄)₃·8H₂O

Gupta¹,

Ghosh²,

Basu³

1996

Acta Phys. Pol. A

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Using the most rigorous approach of direct diagonalization of the Hamiltonian matrix constructed in the complete basis states (364 in number) of the Er3+ ion the observed magnetic susceptibility and anisotropy data of erbium sulphate octahydrate were simulated and the set of crystal field parameters was evaluated. This procedure automatically includes the effect of intermediate coupling and the J-mixing under the crystal field. It was also demonstrated that such rigorous calculation using complete basis states is necessary in order to evaluate the correct set of parameters which may wideJy differ from the values obtained from approximate calculations previousły performed using partial number of basis states of the ion concerned.PACS numbers: 71.70.Ch, 75.10.Dg 1. Introduction The present paper reports the results of simulation of experimental magnetic susceptibility and anisotropy data of Er-sulphate octahydrate by using wave functions which were computed from crystal field theory in the most rigorous way. The crystal fleld (CF) parameters obtained during the process are considered to be accurate ones. For accurate evaluation of any parameter, flrstly it is necessary to evaluate it in a way consistent with all the physical quantities which involve it. Secondly, the most rigorous procedure of calculation of those physical quantities should be followed. Various physical quantities of a rare earth (RE) ion like optical

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Hyperfine interactions of 161Dy in dysprosium pyrogermanate at low temperature

Cited by 12 publications

References 9 publications

Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Optical absorption spectra of doped in yttrium pyrogermanate crystal

Crystal Field Theory of Magnetic Behaviour of Er₂(SO₄)₃·8H₂O

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Hyperfine interactions of 161Dy in dysprosium pyrogermanate at low temperature

Cited by 12 publications

References 9 publications

Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Magnetothermodynamics of the Ising antiferromagnetDy2Ge2O7

Optical absorption spectra of doped in yttrium pyrogermanate crystal

Crystal Field Theory of Magnetic Behaviour of Er2(SO4)3·8H2O

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Crystal Field Theory of Magnetic Behaviour of Er₂(SO₄)₃·8H₂O