Light-induced valence-state switching in BaFCl:La and SrFCl:La

Matsarski, Marie; Lovy, Dominique; Bill, Hans; Mohnhaupt, Martin Klaus

doi:10.1103/PhysRevB.68.205113

Scientific article

English

Light-induced valence-state switching in BaFCl:La and SrFCl:La

Contributors

Matsarski, Marie; Lovy, Dominique; Bill, Hans; Mohnhaupt, Martin Klaus

Published in

Physical review. B, Condensed matter and materials physics, vol. 68, no. 20, 205113

Publication date

2003

Abstract

A tetragonal La[2+] center (symmetry C[4v]) was identified in single crystals of BaFCl and SrFCl doped with lanthanum with the aid of electron paramagnetic resonance (EPR)/electron-nuclear double resonance (ENDOR). This center forms a donor-acceptor couple with initially present F(F-) centers. Switching takes place by illumination of appropriate wavelength. The kinetics of the process was monitored by EPR as La[2+] and the unswitched F center are paramagnetic. The results of our experimental investigation of this kinetics are presented. A foregoing spectroscopic characterization of the La[2+] center allowed one to identify a d-d (the B[1]-E) transition, a charge-transfer band (for BaFCl at 10 940 cm[-1] and at 17 890 cm[-1], respectively) and to obtain a value of 710 cm[-1] for the spin-orbit coupling constant in the ground state. In order to narrow the choice of possible acceptor-donor partners a detailed EPR/optical search was further done to identify a number of lattice defects and oxygen centers—in addition to a La-oxygen molecular structure.

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

UNIGE research groups

Groupe Bill

Citation (ISO format)

MATSARSKI, Marie et al. Light-induced valence-state switching in BaFCl:La and SrFCl:La. In: Physical review. B, Condensed matter and materials physics, 2003, vol. 68, n° 20, p. 205113. doi: 10.1103/PhysRevB.68.205113

Article (Published version)

Identifiers

PID : unige:3512
DOI : 10.1103/PhysRevB.68.205113

Journal ISSN

1098-0121

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02/10/2009 15:17:32

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02/10/2009 15:17:32

Update

09/07/2024 13:27:57

Status update

09/07/2024 13:27:57

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10/06/2025 21:29:04

Light-induced valence-state switching in BaFCl:La and SrFCl:La

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

Main files (1)

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Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation