q-dependent neutron scattering: A signature of the gap anisotropy in high-T-c superconductors

被引:3
作者
Bill, A
Hizhnyakov, V
Sigmund, E
机构
[1] TECH UNIV COTTBUS,INST PHYS,D-03013 COTTBUS,GERMANY
[2] TARTU STATE UNIV,EE-202400 TARTU,ESTONIA
来源
JOURNAL OF SUPERCONDUCTIVITY | 1996年 / 9卷 / 05期
关键词
anisotropy; phonon dispersion; symmetry; structure;
D O I
10.1007/BF00723521
中图分类号
O59 [应用物理学];
学科分类号
摘要
The influence of the superconducting gap anisotropy on the phonon dispersion is discussed for tetragonal and orthorhombic crystals. Superconducting order parameters with different types of s-wave, as well as d- and (s + d)-wave anisotropies, are studied. We show that along specific directions of the Brillouin zone the lineshape (energy and linewidth) of phonons strongly depends on the anisotropy of the gap. Tn this context, we discuss recent experimental results performed on YBa2Cu3O7 single crystals. The data can be well described in terms of an anisotropic s-wave gap function obtained from the nontotally screened interaction of charge carriers with long-range optical phonons. The calculations suggest, furthermore, that it is generally insufficient to describe experiments that involve the anisotropy of the superconducting order parameter solely in terms of its symmetry. Not only the symmetry, but also the specific structure of the gap as a function of k is important. This conclusion holds for those experiments that are not restricted to the pure determination of the phase of the gap.
引用
收藏
页码:493 / 501
页数:9
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