Unusual substitutional properties of Cu in bulk polycrystalline samples of La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Unusual substitutional properties of Cu in bulk polycrystalline samples of La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ
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| Creator |
Tovstolytkin, A.I.
Pogorilyi, A.N. Belous, O.Z. Yanchevski, A.G. |
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| Subject |
Электpонные свойства металлов и сплавов
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| Description |
The transport and magnetoresistive properties of bulk polycrystalline samples of the La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ (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. The transport and magnetoresistive properties of bulk polycrystalline samples of the La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ (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 Tp of the resistivity peak 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₋δ system are well explained in terms of a mixed valence of the Cu ions. |
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| Date |
2018-01-12T17:57:49Z
2018-01-12T17:57:49Z 2001 |
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| Type |
Article
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| Identifier |
Unusual substitutional properties of Cu in bulk polycrystalline samples of La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ
T
/ A.I. Tovstolytkin, A.N.
Pogorilyi,
O.Z. Belous, A.G. Yanchevski // Физика низких температур. — 2001. — Т. 27, № 5. — С. 500-507. — Бібліогр.: 27 назв. — англ.
0132-6414 PACS: 72.60.+g, 75.50.-y http://dspace.nbuv.gov.ua/handle/123456789/128597 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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