POSITRON-ANNIHILATION STUDY OF SPIN-CROSSOVER IN [FEXZN1-X(PTZ)6](BF4)2 SINGLE-CRYSTALS

Authors
VERTES A SUVEGH K HINEK R GUTLICH P
Citation
A. Vertes et al., POSITRON-ANNIHILATION STUDY OF SPIN-CROSSOVER IN [FEXZN1-X(PTZ)6](BF4)2 SINGLE-CRYSTALS, Hyperfine interactions, 84(1-4), 1994, pp. 483-489
Citations number
9
Categorie Soggetti
Physics, Atomic, Molecular & Chemical","Physics, Nuclear","Physics, Condensed Matter
Journal title
Hyperfine interactions → ACNP
ISSN journal
03043843
Volume
84
Issue
1-4
Year of publication
1994
Pages
483 - 489
Database
ISI
SICI code
0304-3843(1994)84:1-4<483:PSOSI[>2.0.ZU;2-0
Abstract
Positron lifetime measurements were carried out on [FexZn1-x(PtZ)6](BF 4)2 single crystals in the temperature range of 72-300 K. Complementar y Doppler broadening spectra were also recorded at room temperature. T he probability of the formation of o-Ps (lifetime 500-1400 ps) was bet ween 10-30%. Both the spin density and the lattice parameters of the s ample affected the lifetime of o-Ps through the ortho-para conversion and the pick-off annihilation, respectively. The positron annihilation technique proved to be a sensitive detector of the spin-crossover 5T2 <-> 1A1 and of the concomitant phase transformation.