Doping and isotope dependence of the pseudogap in high-Tc cuprates observed by neutron crystal-field spectroscopy:: A fast local probe

被引：15

作者：

Rubio, D ^{[1
]}

Mesot, J

Conder, K

Janssen, S

Mutka, H

Furrer, A

机构：

[1] Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

JOURNAL OF SUPERCONDUCTIVITY | 2000年 / 13卷 / 05期

关键词：

doping; isotope effect; pseudogap; high-T-c; cuprates; crystal-field spectroscopy;

D O I：

10.1023/A:1007806029650

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The temperature dependence of the relaxation rate of crystal-field excitations in the highT(c) superconductors HoBa2Cu4O8 and HoBa2Cu3Ox (6.4 < x < 7) was investigated by inelastic neutron scattering techniques. The data show clear evidence for the opening of an electronic gap in the normal state at T* > T-c in the underdoped regime as well as for slightly overdoped samples. For HoBa2Cu4O8 T* increases from 170 to 220 K upon oxygen isotope substitution (O-16 VS O-18). This huge isotope shift (which is absent in NMR and NQR experiments) suggests that the mechanism leading to an isotope effect on the pseudogap has to involve a time scale in the range 10(-8) much greater than tau > 10(-13) s.

引用

页码：727 / 730

页数：4

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