Picosecond dynamics of the spin-lattice relaxation in La0.7Ca0.2MnO3: Magnetic-field dependence - art. no. 060410

Authors
Lobad, AI Averitt, RD Taylor, AJ
Citation
Ai. Lobad et al., Picosecond dynamics of the spin-lattice relaxation in La0.7Ca0.2MnO3: Magnetic-field dependence - art. no. 060410, PHYS REV B, 6305(6), 2001, pp. 0410
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6305
Issue
6
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010201)6305:6<0410:PDOTSR>2.0.ZU;2-8
Abstract
We have employer ultrafast optical pump-probe measurements at 1.5 eV to stu dy the picosecond dynamics of the magnetic-field-induced metal-insulator (M I) transition in La0.7Ca0.3MnO3 thin films in fields up to 7 T. We show tha t field induced modification of the photoinduced dynamic spectral weight tr ansfer (DSWT) is related to changes in the magnetic entropy. The magnetic-f ield-induced increase of the ferromagnetic-paramagnetic transition temperat ure is evident in the spin-lattice relaxation time and amplitude scaling of the DSWT.