Large copper isotope effect on the pseudogap in the high-temperature superconductor HoBa2Cu4O8

被引：38

作者：

Rubio Temprano D. ^{[1
]}

Mesot J. ^{[1
]}

Janssen S. ^{[1
]}

Conder K. ^{[1
]}

Furrer A. ^{[1
]}

Sokolov A. ^{[2
]}

Trounov V. ^{[2
]}

Kazakov S.M. ^{[3
]}

Karpinski J. ^{[3
]}

Müller K.A. ^{[4
]}

机构：

[1] Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen

[2] Petersburg Nuclear Physics Institute

[3] Laboratory for Solid State Physics, ETH Zurich

[4] Physics Institute, University of Zurich

来源：

The European Physical Journal B - Condensed Matter and Complex Systems | 2001年 / 19卷 / 1期

关键词：

74.25-q General properties; correlations between physical properties in normal and superconducting states; 74.72.Bk Y-based cuprates; 76.20.+q General theory of resonances and relaxations;

D O I：

10.1007/s100510170343

中图分类号：

学科分类号：

摘要：

The copper isotope effect (63Cu vs. 65Cu) on the relaxation rate of crystal-field excitations in the slightly underdoped high-temperature superconductor HoBa2Cu4O8 has been investigated by inelastic neutron scattering. For the 63Cu compound there is clear evidence for the opening of an electronic gap in the normal state at T* ≈ 160 K far above Tc = 79.0 K. Upon substitution of 63Cu by 65Cu, Tc decreases marginally to 78.6 K, whereas T* is increased to about 185 K. This large copper isotope shift ΔT*(Cu) = T*(65Cu)-T*(63Cu) ≈ 25 K - together with the corresponding oxygen isotope shift ΔT*(O) = T*(18O) - T*(16O) ≈ 50 K found in an earlier investigation - suggests that phonons or lattice fluctuations involving both the copper and the oxygen ions are important for the pairing mechanism in high-Tc materials.

引用

页码：5 / 8

页数：3

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