Midinfrared absorption in YBa2Cu3O6:: Evidence for a failure of spin-wave theory for spin 1/2 in two dimensions

被引：44

作者：

Grüninger, M

van der Marel, D

Damascelli, A

Erb, A

Nunner, T

Kopp, T

机构：

[1] Univ Geneva, Dept Phys Mat Condensee, CH-1211 Geneva, Switzerland

[2] Univ Groningen, MSC, Solid State Phys Lab, NL-9747 AG Groningen, Netherlands

[3] Univ Augsburg, D-86135 Augsburg, Germany

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.62.12422

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The optical conductivity sigma(omega) of undoped and very low doped YBa2Cu3O6.0 delta is studied in detail in the midinfrared range. We collect experimental evidence for a magnetic origin of the observed absorption. The main resonance peak is well described by a bimagnon-plus-phonon absorption spectrum calculated within spin-wave theory. But spin-wave theory fails to describe further resonances at higher frequencies with significant spectral weight, which grows with both temperature and doping. This underlines the importance of quantum fluctuations for the description of short-wavelength magnetic excitations in a two-dimensional spin-1/2 system.

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页码：12422 / 12426

页数：5

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