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首页> 外文期刊>Physica, C. Superconductivity and its applications >STRUCTURE, SUPERCONDUCTIVITY AND MAGNETISM OF YBA2(CU(1-X)M(X))(4)O-8 (M=FE, CO, NI, ZN AND GA)
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STRUCTURE, SUPERCONDUCTIVITY AND MAGNETISM OF YBA2(CU(1-X)M(X))(4)O-8 (M=FE, CO, NI, ZN AND GA)

机译：YBA2（CU（1-X）M（X））（4）O-8（M = FE，CO，NI，ZN和GA）的结构，超导性和磁性

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YBa2(Cu(1-x)M(x))(4)O-8 (M=Fe, Co, Ni, Zn and Ga; 0 less than or equal to x less than or equal to 0.05) have been investigated by means of X-ray diffraction, electrical-resistivity and magnetic-susceptibility measurements. X-ray-diffraction patterns show that all samples studied contain the nearly single 124 phase. They exhibit an orthorhombio-to-tetragonal structural transition at about x=0.03 for M=Fe and Co; and at x=0.04 for M=Ga; while the structure remains orthorhombic at x=0.05 for M=Ni and Zn. These results suggest that Fe, Co and Ga substitute preferentially for [Cu(1)] sites, and the Ni and Zn prefer to occupy the [Cu(2)] sites. The initial depression rates of T-c0 (temperature of zero resistance) with increasing doping concentration for various dopants are 16.85, 8.4, 23.75, 12 and 3.9 K/at.% for M=Fe, Co, Ni, Zn and Ga, respectively. Effective magnetic moments of YBa2(Cu(0.97)M(0.03))(4)O-8 are 5.63, 3.91 and 3.37 mu(B) for M=Fe, Co and Ni, respectively. In addition, the similarities and differences between YBa2(Cu(1-x)M(x))(4)O-8 and YBa2(Cu(1-x)M(x))(3)O-7-y are discussed. [References: 32]
机译：YBa2（Cu（1-x）M（x））（4）O-8（M = Fe，Co，Ni，Zn和Ga; 0小于或等于x小于或等于0.05）已通过X射线衍射，电阻率和磁化率测量的手段。 X射线衍射图表明，所有研究的样品都包含几乎单一的124相。对于M ＝ Fe和Co，它们在约x ＝ 0.03处显示出正交的结构到四方的结构转变。对于M = Ga，在x = 0.04处;而对于M = Ni和Zn，结构在x = 0.05处保持正交。这些结果表明，Fe，Co和Ga优先替代[Cu（1）]位，而Ni和Zn更倾向于占据[Cu（2）]位。对于M = Fe，Co，Ni，Zn和Ga，随着掺杂浓度的增加，T-c0（零电阻温度）的初始降低速率分别为16.85、8.4、23.75、12和3.9 K / at。％。 。对于M = Fe，Co和Ni，YBa2（Cu（0.97）M（0.03））（4）O-8的有效磁矩分别为5.63、3.91和3.37 mu（B）。此外，YBa2（Cu（1-x）M（x））（4）O-8与YBa2（Cu（1-x）M（x））（3）O-7-y之间的异同是讨论过。 [参考：32]

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