TY - JOUR
T1 - Influence of magnetic ordering on electronic structure of Tb 3+ ion in TbFe 3(BO 3) 4 crystal
AU - Malakhovskii, A. V.
AU - Gnatchenko, S. L.
AU - Kachur, I. S.
AU - Piryatinskaya, V. G.
AU - Sukhachev, A. L.
AU - Temerov, V. L.
PY - 2011/3
Y1 - 2011/3
N2 - Optical absorption spectra of trigonal crystal TbFe 3(BO 3) 4 have been studied in the region of 7F 6 → 5D 4 transition in Tb 3+ ion depending on temperature (2-220 K) and on magnetic field (0-60 kOe). Splitting of the Tb 3+ excited states, both under the influence of the external magnetic field and effective exchange field of the Fe-sublattice, have been determined. Landé factors of the excited states have been found. Stepwise splitting of one of the absorption lines has been discovered in the region of the Fe-sublattice magnetic ordering temperature. This is shown to be due to the abrupt change of equilibrium geometry of the local Tb 3+ ion environment only in the excited state of the Tb 3+ ion. In general, the magnetic ordering is accompanied by temperature variations of the Tb 3+ local environment in the excited states. The crystal field splitting components have been identified. In particular, it has been shown that the ground state (in D 3 symmetry approximation) consists of two close singlet states of A 1 and A 2 type, which are split and magnetized by effective exchange field of the Fe-sublattice. Orientations of magnetic moments of the excited electronic states relative to that of the ground state have been experimentally determined in the magnetically ordered state of the crystal. A pronounced shift of one of absorption lines has been observed in the vicinity of the TbFe 3(BO 3) 4 structural phase transition. The temperature interval of coexistence of the phases is about 3 K.
AB - Optical absorption spectra of trigonal crystal TbFe 3(BO 3) 4 have been studied in the region of 7F 6 → 5D 4 transition in Tb 3+ ion depending on temperature (2-220 K) and on magnetic field (0-60 kOe). Splitting of the Tb 3+ excited states, both under the influence of the external magnetic field and effective exchange field of the Fe-sublattice, have been determined. Landé factors of the excited states have been found. Stepwise splitting of one of the absorption lines has been discovered in the region of the Fe-sublattice magnetic ordering temperature. This is shown to be due to the abrupt change of equilibrium geometry of the local Tb 3+ ion environment only in the excited state of the Tb 3+ ion. In general, the magnetic ordering is accompanied by temperature variations of the Tb 3+ local environment in the excited states. The crystal field splitting components have been identified. In particular, it has been shown that the ground state (in D 3 symmetry approximation) consists of two close singlet states of A 1 and A 2 type, which are split and magnetized by effective exchange field of the Fe-sublattice. Orientations of magnetic moments of the excited electronic states relative to that of the ground state have been experimentally determined in the magnetically ordered state of the crystal. A pronounced shift of one of absorption lines has been observed in the vicinity of the TbFe 3(BO 3) 4 structural phase transition. The temperature interval of coexistence of the phases is about 3 K.
UR - http://www.scopus.com/inward/record.url?scp=84864173016&partnerID=8YFLogxK
U2 - 10.1140/epjb/e2011-10806-x
DO - 10.1140/epjb/e2011-10806-x
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AN - SCOPUS:84864173016
SN - 1434-6028
VL - 80
SP - 1
EP - 10
JO - European Physical Journal B
JF - European Physical Journal B
IS - 1
ER -