Novel Cu-based dz2 order at a YBa2Cu3O7/ manganite interface
Abstract
The interplay of nearly degenerate orders in quantum materials can lead to a myriad of emergent phases. A prominent case is that of the high-Tc cuprates for which the relationship between superconductivity and a short-ranged, incommensurate charge density wave in the CuO2 planes involving the dx2-y2 orbitals (Cu-CDW) is a subject of great current interest. Strong modifications of the strength and coherence of this Cu-CDW have been achieved by applying large magnetic fields, uniaxial pressure, or via the interfacial coupling in cuprate/manganite multilayers. However, such modifications do not alter the dominant orbital character. Here we investigate cuprate/manganite multilayers with resonant inelastic X-ray scattering (RIXS) and show that a new kind of Cu-based density wave order can be induced that has not been previously observed in the cuprates. This order has an unusually small wave vector of Q = 0.096 reciprocal lattice units (r.l.u.), a large correlation length of about 40 nm, and a predominant dz2 orbital character, instead of the typical dx2-y2 character. Its appearance is determined by the hole doping of the manganite which is a key parameter controlling the interfacial charge transfer and orbital reconstruction. We anticipate that the observation of a previously unknown type of density wave order at the YBCO interface will allow for fresh perspectives on the enigmatic relation between superconductivity and charge order (CO) in the cuprates.
Cite
@article{arxiv.2007.15894,
title = {Novel Cu-based dz2 order at a YBa2Cu3O7/ manganite interface},
author = {Roxana Gaina and Christopher W. Nicholson and Maxime Rumo and Subhrangsu Sarkar and Jarji Khmaladze and Eugenio Paris and Yi Tseng and Wenliang Zhang and Teguh C. Asmara and Daniel McNally and Cinthia Piamonteze and Eugen Weschke and Thorsten Schmitt and Claude Monney and Christian Bernhard},
journal= {arXiv preprint arXiv:2007.15894},
year = {2021}
}