TY - JOUR
T1 - Temperature dependence of the mid-infrared absorptions in undoped cuprate Sr2CuO2Cl2
AU - Choi, H. S.
AU - Choi, E. J.
AU - Kim, Y. J.
PY - 1998/8/1
Y1 - 1998/8/1
N2 - We have studied temperature dependence of three mid-infrared absorption peaks of Sr2CuO2Cl2, observed in transmission measurement; a lower-energy sharp peak and two higher-energy broad peaks. As temperature increases, the first one shows position redshift and width broadening. We relate the behaviors to Lorenzana and Sawatzky's model [J. Lorenzana, G.A. Sawatzky, Phys. Rev. Lett. 74, 1995, p. 1867] and attribute the peak to the phonon-assisted bimagnon excitation. We examine the temperature dependence of the peak width and suggest magnon scattering mechanism coupled with magnetic disorder in CuO2 plane, in order to explain the anomalous broadening of the width around the Neel temperature.
AB - We have studied temperature dependence of three mid-infrared absorption peaks of Sr2CuO2Cl2, observed in transmission measurement; a lower-energy sharp peak and two higher-energy broad peaks. As temperature increases, the first one shows position redshift and width broadening. We relate the behaviors to Lorenzana and Sawatzky's model [J. Lorenzana, G.A. Sawatzky, Phys. Rev. Lett. 74, 1995, p. 1867] and attribute the peak to the phonon-assisted bimagnon excitation. We examine the temperature dependence of the peak width and suggest magnon scattering mechanism coupled with magnetic disorder in CuO2 plane, in order to explain the anomalous broadening of the width around the Neel temperature.
KW - Antiferromagnetic order
KW - Infrared spectroscopy
KW - Phonon-assisted bimagnon model
KW - SrCuOCl
UR - http://www.scopus.com/inward/record.url?scp=0032141336&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(98)00271-8
DO - 10.1016/S0921-4534(98)00271-8
M3 - Article
AN - SCOPUS:0032141336
SN - 0921-4534
VL - 304
SP - 66
EP - 72
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -