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Título: | Structural, magnetic, and transport properties of the giant magnetoresistive perovskites La2/3Ca1/3Mn1-xAlXO 3-δ |
Autor: | Blasco, Javier CSIC ORCID; García, Joaquín CSIC ORCID; Teresa, José María de CSIC ORCID ; Ibarra, M. Ricardo CSIC ORCID; Pérez, J.; Algarabel, Pedro A. CSIC ORCID; Marquina, Clara CSIC ORCID | Fecha de publicación: | 1997 | Editor: | American Physical Society | Citación: | Physical Review B 55(14): 8905-8910 (1997) | Resumen: | The effect of the substitution for Mn with Al in the magnetoresistive perovskite La2/3Ca1/3MnO3 has been studied by preparing the series La2/3Ca1/3Mn1−xAlxO3 (x⩽0.2). A careful study of the magnetic, structural, and transport properties has been carried out by means of electrical resistance, magnetoresistance, ac magnetic susceptibility, x-ray-diffraction, and neutron-diffraction techniques. Up to x=0.05 the Curie temperature (and the associated metal-insulator transition) decreases drastically with Al doping and the magnetoresistive properties do not change very much. For x⩾0.1 the lattice spontaneously begins to lose oxygen atoms and for x=0.2, 3% of oxygen vacancies are present. This fact along with the random distribution of the Al atoms makes these compounds rather disordered from a structural and magnetic point of view. However, the magnetoresistance is enhanced, reaching colossal values of 107% at H=12 T at low temperatures for x=0.2. | Versión del editor: | https://doi.org/10.1103/PhysRevB.55.8905 | URI: | http://hdl.handle.net/10261/256498 | DOI: | 10.1103/PhysRevB.55.8905 | ISSN: | 0163-1829 |
Aparece en las colecciones: | (ICMA) Artículos |
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