Unusual substitutional properties of Cu in bulk polycrystalline samples of La₀.₇Ca₀.₃Mn₁₋xCuxO₃₋δ
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 f...
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| Datum: | 2001 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2001
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| Schriftenreihe: | Физика низких температур |
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| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/128597 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | 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. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | 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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