TY - JOUR
T1 - Temperature dependence of the fine structure of the C and E absorption bands in RbMnF 3 below the néel temperature
AU - Malakhovskiĭ, A. V.
AU - Morozova, T. P.
PY - 2006/1
Y1 - 2006/1
N2 - The variation in the parameters (width, position, intensity) of the fine structure lines in the C[ 6 A 1g → 4 E 1g , 4 E g ( 4 G)] and E[ 6 A 1g → 4 E g ( 4 D)] bands in RbMnF 3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow (<6 cm -1 ) lines are distinguished at distances of 77 and 80 cm -1 from the exciton line at T = 10 K. The other lines in the C band and all lines in the E band are more than 20 cm -1 wide. It is demonstrated that the narrow lines become allowed because of the spin-exchange interaction within a long-range magnetic order model and originate from the excitation of exciton-magnon bound states and that the other lines are made allowed by the exchange-vibronic mechanism within a short-range magnetic order model and originate from the excitation of bound states composed of an exciton, magnon, and oddparity phonon. The vibrational replicas of the main exciton-magnon-phonon lines are due to the quadratic vibronic interaction with odd-parity vibrations. Variations of the intensities and widths of the absorption lines with temperature indicate that these parameters are affected by relaxation and delocalization of the bound states.
AB - The variation in the parameters (width, position, intensity) of the fine structure lines in the C[ 6 A 1g → 4 E 1g , 4 E g ( 4 G)] and E[ 6 A 1g → 4 E g ( 4 D)] bands in RbMnF 3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow (<6 cm -1 ) lines are distinguished at distances of 77 and 80 cm -1 from the exciton line at T = 10 K. The other lines in the C band and all lines in the E band are more than 20 cm -1 wide. It is demonstrated that the narrow lines become allowed because of the spin-exchange interaction within a long-range magnetic order model and originate from the excitation of exciton-magnon bound states and that the other lines are made allowed by the exchange-vibronic mechanism within a short-range magnetic order model and originate from the excitation of bound states composed of an exciton, magnon, and oddparity phonon. The vibrational replicas of the main exciton-magnon-phonon lines are due to the quadratic vibronic interaction with odd-parity vibrations. Variations of the intensities and widths of the absorption lines with temperature indicate that these parameters are affected by relaxation and delocalization of the bound states.
UR - http://www.scopus.com/inward/record.url?scp=33645011606&partnerID=8YFLogxK
U2 - 10.1134/s1063783406020156
DO - 10.1134/s1063783406020156
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AN - SCOPUS:33645011606
SN - 1063-7834
VL - 48
SP - 283
EP - 290
JO - Physics of the Solid State
JF - Physics of the Solid State
IS - 2
ER -