Unusual substitutional propertiesof Cu in bulk polycrystalline samples of La0.7 Ca0.3 Mn1-x Cux O3-d

Электpонные свойства металлов и сплавов

Автор(и)

  • A. I. Tovstolytkin Institute of Magnetism, 36-b, Vernadskii St., Kyiv 03142, Ukraine
  • A. N. Pogorilyi Institute of Magnetism, 36-b, Vernadskii St., Kyiv 03142, Ukraine
  • A. G. Belous Institute of General and Inorganic Chemistry, 32/34, Palladina Pr., Kyiv 03142, Ukraine
  • O. Z. Yanchevski Institute of General and Inorganic Chemistry, 32/34, Palladina Pr., Kyiv 03142, Ukraine

DOI:

https://doi.org/10.1063/1.1374722

Ключові слова:

PACS: 72.60. g, 75.50.-y

Анотація

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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Опубліковано

2001-05-10

Як цитувати

(1)
Tovstolytkin, A. I.; Pogorilyi, A. N.; Belous, A. G.; Yanchevski, O. Z. Unusual Substitutional Propertiesof Cu in Bulk Polycrystalline Samples of La0.7 Ca0.3 Mn1-x Cux O3-d: Электpонные свойства металлов и сплавов. Fiz. Nizk. Temp. 2001, 27, 500-507.

Номер

Том 27 № 5 (2001)

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