TY - JOUR
T1 - Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering
AU - Litvinchuk, A. P.
AU - Börjesson, L.
AU - Thomsen, C.
AU - Chu, C. W.
PY - 1999/9
Y1 - 1999/9
N2 - Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm-1 at 300 K to 2480 cm-1 at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* ≈ 150 K.
AB - Polarized Raman scattering spectra of PrBa2Cu4O8 were studied in the temperature range 10 to 300 K. An anomalous temperature dependence of the two-magnon peak was found, which softens upon cooling from about 2590 cm-1 at 300 K to 2480 cm-1 at 10 K. The observed behavior is opposite to what is known for RBa2Cu3O6, R2CuO4 (R = rare earth) and KMnF3-type antiferromagnets, where the two-magnon peak shifts to higher frequencies upon decreasing the in-plane Cu-O bond length due to either lowering temperature or applying pressure. The experimental data are discussed in view of the semiconductor-metal transition which, according to recent optical and transport studies, occurs in PrBa2Cu4O8 at T* ≈ 150 K.
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U2 - 10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.0.CO;2-K
DO - 10.1002/(SICI)1521-3951(199909)215:1<507::AID-PSSB507>3.0.CO;2-K
M3 - Article
AN - SCOPUS:0033197150
SN - 0370-1972
VL - 215
SP - 507
EP - 512
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
IS - 1
ER -