ANOMALOUS MAGNETIC-PROPERTIES OF Y2CU2O5 COMPOUND IN A WEAK MAGNETIC-FIELDстатья
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:Measurements of magnetic susceptibility χ(T, H0) of the single phase Y2Cu2O5 compound in weak H0=(0.05∼2 Oe) and moderate (H0≤500 Oe) magnetic fields are reported. Quite surprisingly, in weak magnetic field H0=0.05 Oe, a diamagnetic χ(T) response of about 2% of χideal(-1/4π) is observed below T≈150 K. At temperatures T∼13 K the Y2Cu2O5 diamagnetism is strongly enhanced up to χ(T=10 K, H0=0.05 K)=26%·χideal. The sharp diamagnetic χ(T) minimum at T=5∼13 K is suppressed by the external magnetic field, and for H≥0.4 Oe this minimum is transformed into a paramagnetic χ(T) maximum. In moderate magnetic field H0=500 Oe, a cusp on the χ(T, H0) curve is observed. This peak corresponds to the transition from the paramagnetic Curie-Weiss χ(T)∼1/(T+θ) to a simple paramagnetic Curie χ(T, H0)∼1/T behavior.