Measurement of magnetic susceptibilities and their anisotropies in Tm3+ pyrogermanate crystal

Sengupta, A.; Dasgupta, S.; Ghosh, D.; Wanklyn, B.M.

doi:10.1016/0038-1098(88)91019-8

Cited by 9 publications

(2 citation statements)

References 7 publications

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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: 95%

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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Section: Introductionmentioning

confidence: 95%

Optical absorption spectra of doped in yttrium pyrogermanate crystal

Das¹,

Ghosh²,

Wanklyn³

1999

J. Phys.: Condens. Matter

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show abstract

“…Among these rare earth germanates, several rare earth pyro-germanates (R 2 Ge 2 O 7 ) were investigated because of their simple crystal structure and the high site symmetry of the R ion in the crystal matrix [1][2][3]6,7,9,13]. Also, the physical properties viz., optical absorption spectra [4,5], magnetic measurements [10,12,16,18,19], nuclear hyperfine properties [11,17,19] including Mö ssbauer effect measurements [14] were carried out on several rare earth pyrogermanates. But in case of rare earth ortho-germanates (ROGs), no study, except the crystal structure investigations [8], is noticed by the authors.…”

Section: Introductionmentioning

confidence: 99%