Phase transitions and crystal-field and exchange interactions in TbFe 3(BO 3) 4 as seen via optical spectroscopy

M. N. Popova; T. N. Stanislavchuk; B. Z. Malkin; L. N. Bezmaternykh

doi:10.1088/0953-8984/24/19/196002

Phase transitions and crystal-field and exchange interactions in TbFe ₃(BO ₃) ₄ as seen via optical spectroscopy

M. N. Popova, T. N. Stanislavchuk, B. Z. Malkin, L. N. Bezmaternykh

Physics

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Abstract

High-resolution polarized broadband (180023000cm ¹) optical absorption spectra of Tb ³⁺ in TbFe ₃(BO ₃) ₄ single crystals are studied between room temperature and 4.2K. The spectral signatures of the structural (R32P3 ₁21, T _S=192K) and magnetic (T _N=41K) phase transitions are found and analyzed. Energies and symmetries of the Tb ³⁺ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3 ₁21 structures of TbFe ₃(BO ₃) ₄ and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the ₁+ ₂ quasi-doublet of the local D ₃ point symmetry group for Tb ³⁺ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb ³⁺ in TbFe ₃(BO ₃) ₄. The value of the TbFe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as J _fd=0.26K and B _eff=3.92T, using the observed splitting =32cm ¹ of the Tb ³⁺ ground quasi-doublet at the temperature 5K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe ₃(BO ₃) ₄. Lattice distortions below T _S were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb ³⁺.

Original language	English (US)
Article number	196002
Journal	Journal of Physics Condensed Matter
Volume	24
Issue number	19
DOIs	https://doi.org/10.1088/0953-8984/24/19/196002
State	Published - May 16 2012

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics

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title = "Phase transitions and crystal-field and exchange interactions in TbFe 3(BO 3) 4 as seen via optical spectroscopy",

abstract = "High-resolution polarized broadband (180023000cm 1) optical absorption spectra of Tb 3+ in TbFe 3(BO 3) 4 single crystals are studied between room temperature and 4.2K. The spectral signatures of the structural (R32P3 121, T S=192K) and magnetic (T N=41K) phase transitions are found and analyzed. Energies and symmetries of the Tb 3+ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3 121 structures of TbFe 3(BO 3) 4 and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the 1+ 2 quasi-doublet of the local D 3 point symmetry group for Tb 3+ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb 3+ in TbFe 3(BO 3) 4. The value of the TbFe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as J fd=0.26K and B eff=3.92T, using the observed splitting =32cm 1 of the Tb 3+ ground quasi-doublet at the temperature 5K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe 3(BO 3) 4. Lattice distortions below T S were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb 3+.",

author = "Popova, {M. N.} and Stanislavchuk, {T. N.} and Malkin, {B. Z.} and Bezmaternykh, {L. N.}",

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T1 - Phase transitions and crystal-field and exchange interactions in TbFe 3(BO 3) 4 as seen via optical spectroscopy

AU - Popova, M. N.

AU - Stanislavchuk, T. N.

AU - Malkin, B. Z.

AU - Bezmaternykh, L. N.

PY - 2012/5/16

Y1 - 2012/5/16

N2 - High-resolution polarized broadband (180023000cm 1) optical absorption spectra of Tb 3+ in TbFe 3(BO 3) 4 single crystals are studied between room temperature and 4.2K. The spectral signatures of the structural (R32P3 121, T S=192K) and magnetic (T N=41K) phase transitions are found and analyzed. Energies and symmetries of the Tb 3+ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3 121 structures of TbFe 3(BO 3) 4 and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the 1+ 2 quasi-doublet of the local D 3 point symmetry group for Tb 3+ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb 3+ in TbFe 3(BO 3) 4. The value of the TbFe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as J fd=0.26K and B eff=3.92T, using the observed splitting =32cm 1 of the Tb 3+ ground quasi-doublet at the temperature 5K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe 3(BO 3) 4. Lattice distortions below T S were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb 3+.

AB - High-resolution polarized broadband (180023000cm 1) optical absorption spectra of Tb 3+ in TbFe 3(BO 3) 4 single crystals are studied between room temperature and 4.2K. The spectral signatures of the structural (R32P3 121, T S=192K) and magnetic (T N=41K) phase transitions are found and analyzed. Energies and symmetries of the Tb 3+ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3 121 structures of TbFe 3(BO 3) 4 and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the 1+ 2 quasi-doublet of the local D 3 point symmetry group for Tb 3+ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb 3+ in TbFe 3(BO 3) 4. The value of the TbFe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as J fd=0.26K and B eff=3.92T, using the observed splitting =32cm 1 of the Tb 3+ ground quasi-doublet at the temperature 5K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe 3(BO 3) 4. Lattice distortions below T S were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb 3+.

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Phase transitions and crystal-field and exchange interactions in TbFe ₃(BO ₃) ₄ as seen via optical spectroscopy

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