Sr2YRuO6的反常磁性
Anomalous Magnetic Properties of Sr2YRuO6
摘要：
本文报道了双钙钛矿型钌酸盐化合物Sr_2YRuO_6的反常磁性。在低磁场中，磁化强度随温度变化的测量结果表明，尽管该化合物中只有Ru ~（5+）的磁矩可以有序排列，但有两个磁序分量（TM 1 ~ 32 K和TM 2 ~ 27 K）相对于磁场方向彼此相反。在TM ~ 2 ~ 27 K范围内，磁序的第二分量只引起磁化反转，而不引起场冷（FC）模式下的负磁化。等温磁化强度（M-H）测量显示在T ~ 27 K时具有最大磁化率（Hc）和剩余磁化强度（Mr）的磁滞现象，证实了两个相反排列的磁矩的存在，每个磁矩都有一个铁磁分量。热容测量中的双峰结构进一步证实了磁有序的两个分量。这些反常性质对Cu取代的Sr_2YRu_（1-x）Cu_xO_6超导化合物的一些早期结果具有重要意义。
英文摘要：
Anomalous magnetic properties of the double perovskite ruthenates compound Sr2YRuO6 are reported here. Magnetization measurements as a function of temperature in low magnetic fields show clear evidence for two components of magnetic order (TM1 ~ 32K and TM2 ~ 27K) aligned opposite to each other with respect to the magnetic field direction even though only Ru5+moments can order magnetically in this compound. The second component of the magnetic order at TM2 ~ 27K results only in a magnetization reversal, and not in the negative magnetization when the magnetization is measured in the field cooled (FC) mode. Isothermal magnetization (M-H) measurements show hysteresis with maximum coercivity (Hc) and remnant magnetization (Mr) at T ~ 27 K, corroborating the presence of the two oppositely aligned magnetic moments, each with a ferromagnetic component. The two components of magnetic ordering are further confirmed by the double peak structure in the heat capacity measurements. These anomalous properties have significance to some of the earlier results obtained for the Cu-substituted superconducting Sr2YRu1-xCuxO6 compounds.
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