Spontaneous magneto striction in La-2/3 (Ca1-x Sr-x) 1/3MnO3 (x = 0, 0.05,0.15, 0.25 and 1.0) near Tc and its field dependence

Authors
Ramos, CA Salva, HR Sanchez, RD Tovar, M Rivadulla, F Mira, J Rivas, J Lopez-Quintela, AM Hueso, L Saint-Paul, M Lejay, P Tokura, Y
Citation
Ca. Ramos et al., Spontaneous magneto striction in La-2/3 (Ca1-x Sr-x) 1/3MnO3 (x = 0, 0.05,0.15, 0.25 and 1.0) near Tc and its field dependence, J MAGN MAGN, 226, 2001, pp. 582-584
Citations number
6
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
03048853 → ACNP
Volume
226
Year of publication
2001
Part
1
Pages
582 - 584
Database
ISI
SICI code
0304-8853(200105)226:<582:SMSIL(>2.0.ZU;2-H
Abstract
We report thermal expansion measurements in La-2/3(Ca1-x Sr-x) (1/3) MnO3 p erovskites. For x = 0 and 0.05 a very narrow and symmetric cusp is observed at Tc, indicating the transition is first order. changing to second order above x = 0.15. The data of an x = I single crystal was fitted in the criti cal region yielding alpha = - 0.14 +/- 0.10 for the critical exponent and A (+) /A(-) = 1.4 +/- 0.4 for the amplitude ratio, both characteristic of 3d- Heisenberg systems. The magnetic field dependence is observed to decrease w ith increasing x. (C) 2001 Elsevier Science B.V. All rights reserved.