Line-shape analyses of magnon Raman spectra of a PrBa2CU2.7Al0.3O7 single crystal

被引：15

作者：

Rubhausen, M ^{[1
]}

Dieckmann, N ^{[1
]}

Bock, A ^{[1
]}

Merkt, U ^{[1
]}

机构：

[1] UNIV HAMBURG, ZENTRUM MIKROSTRUKTURFORSCH, D-20355 HAMBURG, GERMANY

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.54.14967

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present line-shape analyses of magnon Raman spectra in B-1g geometry of a PrBa2Cu2.7Al0.3O7 crystal for various excitation energies. The description is based on the Heisenberg model of antiferromagnetism. Out of resonance, we describe the experimental data by taking into account phonons and a two-magnon excitation using the experimental superexchange energy J=720 cm(-1) and a damping parameter Gamma=200 cm(-1) of the one-magnon states. After subtraction of the fitted line shapes, we identify three additional spectral features at 730 cm(-1), 1170 cm(-1), and 3509 cm(-1). All three show enhanced intensities close to the two-magnon resonance at 2.79 eV excitation energy. This strongly suggests that these excitations have a magnetic rather than a phononic origin.

引用

页码：14967 / 14970

页数：4

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