Magnetic excitations in PrBa2Cu4O8 explored by Raman scattering

A. P. Litvinchuk, L. Börjesson, C. Thomsen, C. W. Chu

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3 引文 斯高帕斯(Scopus)


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.

頁(從 - 到)507-512
期刊Physica Status Solidi (B) Basic Research
出版狀態Published - 1999 9月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學


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