Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR
Bulk Charge Ordering in the CuO2 Plane of the Cuprate Superconductor YBa2Cu3O6.9 by High-Pressure NMR
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DOI：
10.3390/condmat3030023
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发表时间：
2018-09-01
期刊：
影响因子：
1.7
通讯作者：
Haase, Juergen
中科院分区：
文献类型：
--
作者：
Reichardt, Steven;Jurkutat, Michael;Haase, Juergen
铜超导体仍然有许多悬而未决的问题，最近，对称破缺电子荷序的作用在欠掺杂铜中重新出现，作为一种与超导性竞争的现象。在这里，明确的核磁共振（NMR）证明了在几乎最优掺杂的YBa2Cu3O6.9中存在局部电荷有序，即使达到室温。升高压力和降低温度导致CuO2平面上的两个氧原子产生了约0.02空穴的电荷差，并且整个晶体都是有序的。在环境条件下，电荷差略小，阶数下降。文献资料的证据表明，这种电荷顺序在所有铜酸盐的CuO2平面上普遍存在。因此，必须重新评估收费排序在铜中所起的作用。
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.