MOSKVIN, S. A.; GIPPIUS, A. A.; TKACHEV, A. V.; MAHAJAN, A. V.; CHAKRABARTY, T.; PRESNIAKOV, Igor A.; SOBOLEV, Alexey; DEMAZEAU, Gérard

doi:10.1103/PhysRevB.86.241107

Metadatos

Mostrar el registro completo del ítem

Licencia de uso del documento

MOSKVIN, S. A.
Department of Theoretical Physics

GIPPIUS, A. A.
Low Temperature Physics and Superconductivity Department

TKACHEV, A. V.
Low Temperature Physics and Superconductivity Department

Idioma

Article de revue

Este ítem está publicado en

Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2012, vol. 86, n° 24, p. 241107(R)

American Physical Society

Resumen en inglés

A well-isolated Zhang-Rice (ZR) singlet as a ground state of the Cu3+ center in hole-doped cuprates is a leading paradigm in modern theories of high-temperature superconductivity. However, a dramatic temperature evolution of the 6,7Li NMR signal in La2Li0.5Cu0.5O4, a system with a regular lattice of well-isolated Cu3+ centers, reveals significant magnetic fluctuations and suggests a quasidegeneracy to be a generic property of their ground state at variance with the simple ZR model. We argue for a competition of the ZR state with nearby states formed by a "doped" hole occupying purely oxygen nonbonding a2g(π) and eu(π) orbitals rather than a conventional b1g(dx2−y2) Cu 3d-O 2p hybrid. The temperature variation of the 6,7Li NMR line shape and spin-lattice relaxation rate point to a gradual slowing down of some magnetic order parameter's fluctuations without distinct signatures of a phase transition down to T=2 K. This behavior agrees with a stripelike ferrodistortive fluctuating Ammm order in a two-dimensional structure of the (CuLi)O2 planes accompanied by unconventional oxygen orbital antiferromagnetic fluctuations.< Leer menos

Metadatos

Licencia de uso del documento

Sin título

Idioma

Este ítem está publicado en

Resumen en inglés

DOI

Orígen

Centros de investigación