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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2362| Spin-Lattice Coupling, Jahn-Teler Efect and the Influence of the Measurement Rate in La0.7Ca0.3-xSrxMnO3 Manganites | |
| Luis Andrés Burrola Gándara Pedro Pizá Ruiz Renee Joselin Saénz Hernández CARLOS ROBERTO SANTILLAN RODRIGUEZ DANIEL LARDIZABAL GUTIERREZ JOSE TRINIDAD ELIZALDE GALINDO José A. Matutes-Aquino | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Spin-Lattice Coupling, Jahn-Teller Effect, Influence of the Measurement Rate, La0.7Ca0.3-xSrxMnO3, Manganites | |
| This work presents a study of how the magnetic and temperature variables, as well as the measurement rate, affect magnetic and structural phase transitions for La0.7Ca0.3-xSrxMnO3 (x=0.15, 0.08, 0.07 and 0.06) manganites. A single phase rhombohedral crystal structure for Sr0.15 compound and a single phase orthorhombic crystal structure for Sr0.08, Sr0.07, and Sr0.06 compounds were identified by X ray diffraction. The Curie temperature adjustment to room temperature was reached for Sr0.07 sample, in which a Jahn-Teller transition was observed. This Jahn-Teller transition showed a susceptible response to 0.5, 1, 2, 3, 5 and 7 K/min measurement rates, and was revealed without measurement sequence at 234, 257, 196, 233, 245 and 238 K respectively in thermomagnetic curves (10mT). Also, Curie temperature increases sequentially around 2 K for the same measurement rates. To avoid magnetic field effect, a differential scanning calorimetry for Sr0.07 sample was obtained in the same temperature region, for 2, 3, 5, 7 K/min showing the Jahn-Teller phase transition at 225 K and a vibrational like behavior in the heat flux below 225 K, for all the temperature rates. The latter, is related to the static to dynamic Jahn-Teller transition. Furthermore, Curie temperature appears around 284 K. | |
| Centro de Investigación en Materiales Avanzados | |
| 17-03-2016 | |
| Artículo | |
| Inglés | |
| MOLÉCULAS INORGÁNICAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
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