Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR

Condensed Matter

Kohlrautz, Jonas¹  Reichardt, Steven²  Jurkutat, Michael³  Guehne, Robin⁴ 

[1] Author to whom correspondence should be addressed;Felix Bloch Institute for Solid State Physics, University of Leipzig, Linnestr. 5, 04103 Leipzig, Germany;The MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand;Walther-Meißner-Institute for Low Temperature Research, Walther-Meißnerstr. 8, 85748 Garching, Germany

关键词: cuprates;    charge order;    NMR;    high pressure;   

DOI  :  10.3390/condmat3030023

学科分类：凝聚态物理

来源: mdpi

【 摘 要 】

Cuprate superconductors still hold many open questions, and recently, the role of symmetry breaking electronic charge ordering resurfaced in underdoped cuprates as a phenomenon that competes with superconductivity. Here, unambiguous nuclear magnetic resonance (NMR) proof is presented for the existence of local charge ordering in nearly optimally doped YBa2Cu3O6.9, even up to room temperature. Increasing pressure and decreasing temperature leads to the highest degree of order in the sense that the two oxygen atoms of the unit cell of the CuO2 plane develop a charge difference of about 0.02 holes, and order throughout the whole crystal. At ambient conditions, a slightly smaller charge difference and a decreased order is found. Evidence from literature data suggests that this charge ordering is ubiquitous to the CuO2 plane of all cuprates. Thus, the role of charge ordering in the cuprates must be reassessed.

【 授权许可】

CC BY