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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Phase transitions and crystal-field and exchange interactions in TbFe3(BO3)4 as seen via optical spectroscopy
Место публикации : J. Phys.: Condens. Matter: IOP Publishing Ltd, 2012. - Vol. 24, Is. 19. - Ст.196002. - ISSN 0953-8984, DOI 10.1088/0953-8984/24/19/196002
Примечания : Cited References: 45. - The assistance of E P Chukalina is acknowledged. This work was supported in part by the Russian Foundation for Basic Research (grants No 10-02-01071-a and No 09-02-00171-a), by the Ministry of Education and Science (grant HIII-4828.2012.2), and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: IRON BORATE GDFE3(BO3)4
PROBE
ION
Аннотация: High-resolution polarized broadband (1800–23 000 cm−1) optical absorption spectra of Tb3+ in TbFe3(BO3)4 single crystals are studied between room temperature and 4.2 K. The spectral signatures of the structural (R32–P3121, TS = 192 K) and magnetic (TN = 41 K) phase transitions are found and analyzed. Energies and symmetries of the Tb3+ crystal-field (CF) levels were determined for both the high-temperature R32 and the low-temperature P3121 structures of TbFe3(BO3)4 and compared with the calculated ones. It follows unambiguously from the spectral data that the ground state is the Γ1 + Γ2 quasi-doublet of the local D3 point symmetry group for Tb3+ in the R32 high-temperature structure. The CF calculations revealed the CF parameters and wavefunctions for Tb3+ in TbFe3(BO3)4. The value of the Tb–Fe exchange integral and of the effective magnetic field created by the ordered Fe subsystem were estimated as Jfd = 0.26 K and Beff = 3.92 T, using the observed splitting Δ = 32 cm−1 of the Tb3+ ground quasi-doublet at the temperature 5 K. The reliability of the obtained parameters was proven by modeling the literature data on the magnetic susceptibility of TbFe3(BO3)4. Lattice distortions below TS were evidenced by the observed changes of probabilities of the forced electric dipole transitions of Tb3+.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Avramov P. V., Ovchinnikov S. G., Varganov S. A., Tomilin F. N.
Заглавие : Electronic and atomic structures of the isomers of endohedral and exohedral fullerene complexes with two lithium atoms
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2001. - Vol. 43, Is. 9. - P1794-1799. - ISSN 1063-7834, DOI 10.1134/1.1402242
Примечания : Cited References: 21
Предметные рубрики: VIBRATION-ROTATION BANDS
INFRARED ROTATION
C-60
BUCKMINSTERFULLERENE
ION
Аннотация: The electronic structures of all the possible isomers of endohedral and exohedral C(60) fullerene complexes with two lithium atoms are theoretically investigated. It is found that the electronic structures of these compounds are characterized by an impurity filled-level state determining the band gap. The location of the impurity state and, correspondingly, the band gap of the exohedral fullerene complexes depend on the coordination mode and the distance between the alkali metal ions. A similar dependence is observed for the total energy of the exohedral fullerene complex under investigation. (C) 2001 MAIK "Nauka/ Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Optical spectroscopy of PrFe3(BO3)(4): Crystal-field and anisotropic Pr-Fe exchange interactions
Коллективы : Russian Foundation for Basic Research [07-02-01185, 09-02-00930]; Russian Academy of Sciences under the Programs for Basic Research
Разночтения заглавия :авие SCOPUS: Optical spectroscopy of PrFe3 (BO3) 4: Crystal-field and anisotropic Pr-Fe exchange interactions
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 19. - Ст.195101. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.195101
Примечания : Cited References: 36. - We thank S. Klimin for useful information concerning the structure of PrFeINF3/INF(BOINF3/INF)INF4/INF and E. Chukalina for participating in some measurements. This work was supported in part by the Russian Foundation for Basic Research (Grants No. 07-02-01185 and No. 09-02-00930) and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: TRIGONAL GDFE3(BO3)(4)
NDFE3(BO3)(4)
DYFE3(BO3)(4)
TRANSITIONS
BORATE
ION
ND
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--crystal field interactions--exchange interactions (electron)--infrared spectra--iron compounds--magnetic susceptibility--magneto-optical effects--paramagnetic materials--praseodymium compounds--spin hamiltonians--visible spectra
Аннотация: High-resolution polarized optical absorption spectra of PrFe3(BO3)(4) in the paramagnetic and antiferromagnetic phases are reported. The measured energies of the crystal-field (CF) levels within the 4f(2) configuration of Pr3+ in the paramagnetic PrFe3(BO3)(4) are described by the CF model that involves the 4f(2)/4f5d and 4f(2)/4f6p configuration interactions. Ordering of Fe spins along the crystalline c axis below T-N=32 K is confirmed by the analysis of the spectra of Er3+ introduced as a probe into PrFe3(BO3)(4). To account for the observed changes in the optical spectra of Pr3+ at temperatures below T-N, in particular, for the shift of the CF levels, splitting of the CF doublets, and the appearance of forbidden lines, the Pr-Fe exchange Hamiltonian defined by seven parameters is considered. The theoretical approach has been tested by calculating the temperature dependence of the magnetic susceptibility. A good agreement between theory and optical and magnetic experimental data is found demonstrating the validity of the model used. The obtained results confirm that the model of the iron dimers inside the spiral chains of Fe3+(O2-)(6) octahedrons introduced by us earlier for NdFe3(BO3)(4) and modified in the present work may serve as a basis for analyzing the low-temperature properties of other rare-earth iron borates.
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