An anomaly in the magnetic susceptibility of the Mg1−x CuxO solid solutions with 0.01≤x≤0.20

Autor: A. A. Samokhvalov, A. V. Korolev, S. V. Naumov, T. I. Arbuzova, I. B. Smolyak, N. A. Viglin, N. I. Lobachevskaya
Rok vydání: 2000
Předmět:
Zdroj: Physics of the Solid State. 42:719-721
ISSN: 1090-6460
1063-7834
Popis: The problem of localized superconductivity has motivated the preparation of Mg1−xCuxO solid solutions with NaCl structure and 0.01≤x≤0.20, as well as a study of the magnetization and magnetic susceptibility χ in the 2–400 K temperature range and in magnetic fields of up to 5 T. The temperature dependence of χ is described for all compositions by the Curie-Weiss law, χ = C/(T − θ), where the constant C is close to the value calculated for each composition for μeff = 1.7–1.9µB, and θ is close to zero. For T < 30 K, χ(T) deviates for all compositions toward lower χ, which can be attributed to magnetic ordering of exchange-coupled clusters in the solid solution. At T∼320–330 K, an anomaly of a diamagnetic type, i.e., a decrease of χ by 6–30% of its paramagnetic value, has been observed for all compositions against the background of the generally paramagnetic χ(T). A discussion is presented of alternative reasons for this anomaly and of its possible connection with localized superconductivity.
Databáze: OpenAIRE
Externí odkaz: