THEORY OF MAGNETIC NEUTRON-SCATTERING FOR S-WAVE AND D-WAVE SUPERCONDUCTIVITY IN CUPRATES

被引：5
|
作者：
DAHM, T [1 ]
RIECK, CT [1 ]
TEWORDT, L [1 ]
WERMBTER, S [1 ]
机构：
[1] UNIV BREMEN,INST THEORET PHYS,D-28334 BREMEN,GERMANY
来源：
PHYSICA C | 1994年 / 223卷 / 1-2期
关键词：
D O I：
10.1016/0921-4534(94)90711-0
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We present a microscopic theory for strong spin-fluctuation exchange interaction and an additional electron-phonon interaction alpha2F(q, omega). For an appropriate alpha2F being independent of q we find s-wave superconductivity, whereas for an alpha2F which is strongly suppressed at larger q due to strong electron correlations we find d-wave superconductivity. The resulting spectral weights of the dynamic spin susceptibility are in qualitative agreement with the neutron scattering data obtained on La1.86Sr0.14CuO4 and YBa2Cu3O6.92, respectively. For the d-wave pairing case the electronic thermal conductivity and the low-frequency electrical conductivity exhibit broad, but relatively small peaks below T(c). The quasiparticle relaxation rate decreases rapidly as T drops below T(c), in qualitative agreement with microwave and ultrafast laser measurements on YBCO and BISCO.
引用
收藏
页码：179 / 188
页数：10
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