Electronic crossover in the normal state of YBa2Cu4O8

被引：39

作者：

Suter, A ^{[1
]}

Mali, M ^{[1
]}

Roos, J ^{[1
]}

Brinkmann, D ^{[1
]}

Karpinski, J ^{[1
]}

Kaldis, E ^{[1
]}

机构：

[1] ETH ZURICH,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.56.5542

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By performing nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR), respectively, with Cu, O, and Y isotopes in the normal state of the high-temperature superconductor YBa2Cu4O8. we have found the following major results: (i) The Y, Cu, and O shift data support, for planes and chains, the validity of the ''single-spin fluid model.'' (ii) Around T-dagger = 180 K, ''anomalies'' in the temperature behavior of several NMR/NQR quantities have been detected. (iii) The anomalies do not arise from a structural phase transition; instead they reflect an electronic crossover which involves enhanced charge fluctuations in planes and chains accompanied by a charge (hole) transfer from chain to plane. (iv) As a possible mechanism of the crossover, a charge-density-wave instability is proposed.

引用

页码：5542 / 5551

页数：10

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