Unusual substitutional propertiesof Cu in bulk polycrystalline samples of La0.7 Ca0.3 Mn1-x Cux O3-d
Электpонные свойства металлов и сплавов
DOI (Low Temperature Physics):
https://doi.org/10.1063/1.1374722Ключові слова:
PACS: 72.60. g, 75.50.-yАнотація
The transport and magnetoresistive properties of bulk polycrystalline samples of the La0.7Ca0.3Mn1-xCuxO3-d (x ≤ 0.15) system are studied in the temperature range 77 K-300 K. All the samples investigated exhibit the giant magnetoresistance effect associated with the transition from the ferromagnetic metallic to the paramagnetic insulating state. As a function of copper concentration, the temperature of the resistivity peak, Tp, first decreases from 193 K (x=0) to 108 K (x=0.10) and then gradually grows, reaching 120 K at x=0.15. Significant temperature broadening of the resistive transition as well as anomalous behavior of the peak value of the resistivity are observed near x=0.10. The unusual properties of the La0.7Ca0.3Mn1-xCuxO3-d system are well explained in terms of a mixed valence of the Cu ions.
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2001-05-10
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A. I. Tovstolytkin, A. N. Pogorilyi, A. G. Belous, and O. Z. Yanchevski, Unusual substitutional propertiesof Cu in bulk polycrystalline samples of La0.7 Ca0.3 Mn1-x Cux O3-d: Электpонные свойства металлов и сплавов, Low Temp. Phys. 27, (2001) [Fiz. Nizk. Temp. 27, 500-507, (2001)] DOI: https://doi.org/10.1063/1.1374722.
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