Momentum-Dependent Charge Correlations in YBa2Cu3O6+δ Superconductors Probed by Resonant X-Ray Scattering: Evidence for Three Competing Phases

被引：163

作者：

Blanco-Canosa, S. ^{[1
]}

Frano, A. ^{[1
,2
]}

Loew, T. ^{[1
]}

Lu, Y. ^{[1
]}

Porras, J. ^{[1
]}

Ghiringhelli, G. ^{[3
,4
]}

Minola, M. ^{[3
,4
]}

Mazzoli, C. ^{[3
,4
]}

Braicovich, L. ^{[3
,4
]}

Schierle, E. ^{[2
]}

Weschke, E. ^{[2
]}

Le Tacon, M. ^{[1
]}

Keimer, B. ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Helmholtz Zentrum Berlin Mat & Energie, D-12489 Berlin, Germany

[3] Politecn Milan, CNR SPIN, CNISM, I-20133 Milan, Italy

[4] Politecn Milan, CNR SPIN, Dipartimento Fis, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 18期

关键词：

STRIPE ORDER; FLUCTUATING STRIPES; ZN-SUBSTITUTION; FERMI-SURFACE; PSEUDOGAP; INSULATOR;

D O I：

10.1103/PhysRevLett.110.187001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use resonant x-ray scattering to determine the momentum-dependent charge correlations in YBa2Cu3O6.55 samples with highly ordered chain arrays of oxygen acceptors (ortho-II structure). The results reveal nearly critical, biaxial charge density wave (CDW) correlations at in-plane wave vectors (0.315, 0) and (0, 0.325). The corresponding scattering intensity exhibits a strong uniaxial anisotropy. The CDW amplitude and correlation length are enhanced as superconductivity is weakened by an external magnetic field. Analogous experiments are carried out on a YBa2Cu3O6.6 crystal with a dilute concentration of spinless (Zn) impurities, which had earlier been shown to nucleate incommensurate magnetic order. Compared to pristine crystals with the same doping level, the CDW amplitude and correlation length are found to be strongly reduced. These results indicate a three-phase competition between spin-modulated, charge-modulated, and superconducting states in underdoped YBa2Cu3O6+delta.

引用

页数：5

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