M 17 Magnetic and electrical properties of Mg12xCuxO solid solutions and magnetic shielding in Cu–Mg12xCuxO structures / A. A. Samokhvalov, T. I. Arbuzova, N. A. Viglin, V. V. Osipov, N. I. Solin, S. V. Naumov, V. G. Bamburov, N. I. Lobachevskaya, O. G. Reznitskikh // Physics of the Solid State. - 1999. - Vol. 41, № 2. - P262-264 : il. - Bibliogr. : p. 264 (7 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): СВЕРХПРОВОДНИКИ -- ОКСИКУПРАТ МАГНИЯ -- ЭЛЕКТРОПРОВОДНОСТЬ Аннотация: Mg12xCuxO solid solutions having an NaCl structure with 0 Полный текст |
A 53 An Anomaly in the Magnetic Susceptibility of the Mg1 – xCuxO Solid Solutions with 0.01 / A. A. Samokhvalov, T. I. Arbuzova, N. A. Viglin, S. V. Naumov, I. B. Smolyak, A. V. Korolev, N. I. Lobachevskaya // Physics of the Solid State. - 2000. - Vol. 42, № 4. - P719-721 : il. - Bibliogr. : p. 721 (5 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): СВЕРХПРОВОДИМОСТЬ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ -- ОКСИКУПРАТ МАГНИЯ Аннотация: 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 X in the 2–400 K temperature range and in magnetic fields of up to 5 T. The temperature dependence of X is described for all compositions by the Curie–Weiss law,X = C/(T –teta), where the constant C is close to the value calculated for each composition for m off = 1.7–1.9 m(beta), and (teta) is close to zero. For T < 30 K, X(T) deviates for all compositions toward lower X, 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 X by 6–30% of&&its paramagnetic value, has been observed for all compositions against the background of the generally paramagnetic X(T). A discussion is presented of alternative reasons for this anomaly and of its possible connection with localized superconductivity Полный текст |