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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Leont'ev A. A., Gudim, I. A., Krylov A. S., Aleksandrovsky A. S.
Заглавие : Spectroscopic properties of Nd0.5Gd0.5Fe3(BO3)4 single crystal
Место публикации : J. Alloys Compd.: Elsevier, 2012. - Vol. 529. - P.38-43. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2012.03.066
Примечания : Cited References: 51. - The work was supported by the Russian Foundation for Basic Researches grant 12-02-00026, by the Russian President Grants SS-1044.2012.2 and SS-4828.2012.2, by Ministry of Education and Science of Russian Federation (Contract 16.740.11.0150), by grant no. SFU.F12 and by Projects No. 28, 43 and No. 101 of SB RAS.
Предметные рубрики: SPECTRAL-LINE INTENSITIES
RARE-EARTH IONS
MAGNETIC-PROPERTIES
NDAL3(BO3)(4) NAB
OPTICAL-SPECTRA
LASER CRYSTAL
TRANSITIONS
ABSORPTION
ND3+
PR3+
Ключевые слова (''Своб.индексиров.''): magnetically ordered materials--rare earth alloys and compounds--transition metal alloys and compounds--optical properties
Аннотация: The polarized absorption spectra of trigonal single crystal Nd0.5Gd0.5Fe3(BO3)4 were measured in the spectral range 10,000–22,000 cm−1. The d–d and f–f transitions spectra were separated. The f–f transitions intensities were analyzed in terms of the Judd–Ofelt theory in a ferroborate with huntite structure for the first time, and the following parameters of the theory were obtained: Ω2 = 4.4 × 10−20 cm2, Ω4 = 8.04 × 10−20 cm2, and Ω6 = 8.25 × 10−20 cm2. The strengths, spontaneous emission probabilities, branching ratios, spectroscopic quality factor and excited state lifetime were calculated for transitions from the 4F3/2 state to 4IJ manifold. All the obtained spectroscopic characteristics were compared with those of alumoborates with the same crystal structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Sokolov V. V., Gudim, I. A.
Заглавие : Giant natural circular dichroism of vibronic transitions in HoAl3(BO3)4
Место публикации : JETP Letters. - 2015. - Vol. 102, Is. 8. - P.493-495. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364015200084
Примечания : Cited References: 15. - This work was supported by the Council of the President of the Russian Federation for the Support of Leading Scientific Schools (project no. NSh-2886.2014.2).
Предметные рубрики: SINGLE-CRYSTAL
OPTICAL-ABSORPTION
SPECTRA
Ho3+
IONS
PR3+
Аннотация: The giant natural optical activity of vibronic replicas of the f–f5/8 → 5F2 transition in HoAl3(BO3)4 is observed. It exceeds the optical activity related to purely electronic transitions by two orders of magnitude and corresponds to the almost complete circular polarization of the transitions. This effect is explained by the local distortions of the crystal in the excited electronic state, which lead to the mixing of electron and vibrational wavefunctions and, as a consequence, to the delocalization of the vibronic wavefunction and the enhancement of spatial dispersion, which is responsible for the optical activity.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sukhachev A. L., Leont'ev A. A., Temerov V. L.
Заглавие : Magnetic and natural optical activity of f–f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4
Коллективы : Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools [NSh-2886.2014.2]; Russian Foundation for Basic Research [16-02-00273]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 5. - P.952-958. - ISSN 1063-7834, DOI 10.1134/S1063783416050152. - ISSN 1090-6460(eISSN)
Примечания : Cited References:29. - This study was supported by the Council on Grants from the President of the Russian Federation for the State Support of Leading Scientific Schools (grant no. NSh-2886.2014.2) and the Russian Foundation for Basic Research (project no. 16-02-00273).
Предметные рубрики: Circular-dichroism spectra
Magnetooptical properties
Single-crystal
Absorption
Ions
NdFe3(BO3)4
Nd3+
Pr3+
Ho3+
Аннотация: Spectra of absorption, magnetic circular dichroism, and natural circular dichroism of the f–f transitions 4I9/2 → 4F3/2, 2H9/2 + 4F5/2, 4S3/2 + 4F7/2, 2G7/2 + 4G5/2, 2K13/2 + 4G7/2, and 4G9/2 in the Nd3+ ions in the Nd0.5Gd0.5Fe3(BO3)4 crystal have been measured as a function of the temperature in the interval of 90–300 K. Temperature dependences of the magneto-optical activity (MOA) and natural optical activity (NOA) of the transitions have been obtained. It has been found that, in contrast to allowed transitions, the temperature dependence of the MOA of the f–f transitions does not obey the Curie–Weiss law and the NOA depends on temperature. The NOA of some transitions changes the sign with variation in temperature. These phenomena have been explained by the presence of three contributions to the allowance of the f–f transitions, which lead to three contributions of different signs to the MOA and NOA. The range of the MOA of the f–f transitions in the Nd3+ ion has been predicted theoretically and confirmed experimentally.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Isachenko V. A., Sukhachev A. L., Potseluyko A. M., Zabluda V. N., Zarubina T. V., Edelman I. S.
Заглавие : Magneto-optical properties of Dy3+ in oxide glasses: The origin of the magneto-optical activity of f-f transitions and its anomalous temperature dependence
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P701-707. - ISSN 1063-7834, DOI 10.1134/S1063783407040178
Примечания : Cited References: 28
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
FLUOROZIRCONATE ZBLAN GLASS
OPTICAL-ABSORPTION SPECTRA
DOPED SODA GLASS
SPECTROSCOPIC PROPERTIES
FLUOROBORATE GLASSES
LITHIUM BORATE
IONS
PR3+
GADOLINIUM
Аннотация: The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the H-6(15/2) to F-6 (5/2) and (6)(F (7/2) + H (5/2)) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+ ions associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity.
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