Superconductivity and Ferromagnetism of the Ru-1232 Compounds in the (Ru1?xNbx)Sr2(GdCe1.8Sr0.2)Cu2Oz System |
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Authors: | Yoshiya Akagi Hiroyuki Sasakura Satoru Noguchi Shigeki Tsukui Takashi Oka and Motoaki Adachi |
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Affiliation: | (1) Department of Physics, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka, 431-3192, Japan;(2) Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan;(3) Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai, Osaka, 599-8570, Japan |
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Abstract: | The Ru-1232 compounds have been synthesized in the (Ru1–xNb
x
)Sr2(GdCe1.8Sr0.2)Cu2O
z
system, and effects of Nb substitution for Ru on superconductivity and ferromagnetism of the Ru-1232 compounds have been investigated. First, X-ray powder diffraction study shows that nearly the single 1232 phase samples can be obtained in the x composition range from 0.0 to 0.3. Then, from the electrical resistivity study, it is found that each of the samples shows resistivity dropping phenomenon at two temperatures of T
c
l and T
c
h, which originates from superconductivity of the Ru-1232 phase and the Ru-1222 one, respectively. Both of the starting temperatures are lowering with increasing Nb content x. Lastly, from the magnetic susceptibility study, it is found that superconducting transition temperature T
c is 20 K for the Ru-1232 sample with x = 0.0 and the ferromagnetic transition temperature T
m is about 90 K. This study also shows that both of the values of T
c and T
m become low with increasing x from 0.0 to 0.3. |
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Keywords: | (Ru1– xNb
x
)Sr2(GdCe1 8Sr0 2)Cu2O
z
system Ru-1232 compounds superconductivity ferromagnetism |
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