Work

Direct observation of Ni 3+ and Ni 2+ in correlated LaNiO 3−δ films

Year: 2011

Type: article

Abstract: The X-ray photoelectron spectroscopic deconvolution analysis is applied to quantitatively distinguish valence states of Ni and to obtain the δ value in LaNiO 3−δ films on Si substrates. The mechanism of the Ni 3+ /Ni 2+ ratio dependent transport is clarified by the combination of transport measurements and first-principle calculations. At lower Ni 3+ /Ni 2+ ratio of 0.39, the LaNiO 2.64 film exhibits semi-conductive behavior with carriers mainly being hopping polarons, while higher Ni 3+ /Ni 2+ ratio transfers the LaNiO 2.84 film to an electronic conductor. The observed reduction of the electron-phonon interaction, shortened mean free path, and increased electron-electron coupling are suggested to be correlated to high Ni 3+ /Ni 2+ ratio.

Source: Europhysics Letters (EPL)

DOI: 10.1209/0295-5075/93/57002

Authors: Liang Qiao, Xiaofang Bi

Institution: Beihang University

Language: English

Topic: Magnetic and transport properties of perovskites and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

Funders: Beihang University, Program for New Century Excellent Talents in University

OpenAlex ID: W1954406248

FWCI: 1.259

Cites: 36

Cited by: 145

Related to: 10