頁籤選單縮合
| 題 名 | Physical Properties of the Weak-Ferromagnetic Superconductor RuSr₂EuCu₂O₈ |
|---|---|
| 作 者 | Chang, B. C.; Yang, C. Y.; Ku, H. C.; Ho, J. C.; Tsai, C. B.; Chen, Y. Y.; Ho, J. C.; | 書刊名 | Chinese Journal of Physics |
| 卷 期 | 47:4 2009.08[民98.08] |
| 頁 次 | 頁529-539 |
| 分類號 | 337.472 |
| 關鍵詞 | |
| 語 文 | 英文(English) |
| 英文摘要 | Similar to the optimal-doped, weak-ferromagnetic (WFM induced by canted antiferromagnetism, TCurie = 131 K) and superconducting (Tc = 56 K) RuSr2GdCu2O8, underdoped RuSr2EuCu2O8 (TCurie = 133 K, Tc = 36 K) also exhibited a spontaneous vortex state (SVS) between 16 K and 36 K. The low field (±20 G) superconducting hysteresis loop indicates a weak and narrow Meissner state region of average lower critical field B□(T ) = B□(0)[1 − (T/TSVS)2], with B□ (0) = 7 G and TSVS = 16 K. The vortex melting transition (Tmelting = 21 K) below Tc, obtained from the broad resistivity drop and the onset of the diamagnetic signal, indicates a vortex liquid region due to the coexistence and interplay between superconductivity and the WFM order. No visible jump in specific heat was observed near Tc for Eu- and Gd-compounds. Finally, with the baseline from the nonmagnetic Eu-compound, the specific heat data analysis confirms the magnetic entropy associated with antiferromagnetic ordering of Gd3+ (J = S = 7/2) at 2.5 K to be close to NAk ln 8, as expected. |
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