Silver route to cuprate analogs.
Proc Natl Acad Sci U S A
; 116(5): 1495-1500, 2019 01 29.
Article
em En
| MEDLINE
| ID: mdl-30651308
ABSTRACT
The parent compound of high-[Formula see text] superconducting cuprates is a unique Mott insulator consisting of layers of spin-[Formula see text] ions forming a square lattice and with a record high in-plane antiferromagnetic coupling. Compounds with similar characteristics have long been searched for without success. Here, we use a combination of experimental and theoretical tools to show that commercial [Formula see text] is an excellent cuprate analog with remarkably similar electronic parameters to [Formula see text] but larger buckling of planes. Two-magnon Raman scattering and inelastic neutron scattering reveal a superexchange constant reaching 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the [Formula see text] planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2019
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Article