MAGNON-SCATTERING SPECTRA OF PRBA2CU3O6, PRBA2CU3O7, NDBA2CU3O6, AND ND1.6BA1.4CU3O7.3

被引：16

作者：

YOSHIDA, M

KOSHIZUKA, N

TANAKA, S

机构：

[1] Superconductivity Research Laboratory, International Superconductivity Technology Center, Koto-ku, Tokyo 135

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.42.8760

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman-scattering spectra from PrBa2Cu3O6, PrBa2Cu3O7, NdBa2Cu3O6, and Nd1.6Ba1.4Cu3O7.3 single crystals have been measured at room temperature. Magnon-pair-scattering peaks with B1g symmetry have been observed in PrBa2Cu3O6, NdBa2Cu3O6, and Nd1.6Ba1.4Cu3O7.3, and the exchange integrals have been determined as 920, 930, and 950 cm-1, respectively. The exchange integral of the compounds with the Cu-O5 pyramid structure decreases as the Cu-Cu distance increases. On the other hand, it is found that the magnon-pair scattering is suppressed in nonsuperconducting PrBa2Cu3O7, suggesting that holes are not localized on the Pr site, but have a probability to populate the Cu-O plane just as in the superconducting Y-Ba-Cu-O type compounds. © 1990 The American Physical Society.

引用

页码：8760 / 8763

页数：4

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