Superconducting and electrical properties of amorphous zirconium-transition metal binary alloys
Superconducting and electrical properties of amorphous zirconium-transition metal binary alloys
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非晶锆-过渡金属二元合金的超导和电学性能
DOI：
10.1007/bf00553260
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发表时间：
1986
影响因子：
4.5
通讯作者：
H. Chen
中科院分区：
文献类型：
--
作者：
A. Inoue;K. Matsuzaki;T. Masumoto;H. Chen
为了弄清锆过渡金属(M)二元非晶合金的成分对其超导性的影响，研究了锆过渡金属(M)二元非晶合金的超导性能和电阻随M元素浓度、族数和周期的变化规律。zr75 - m25合金的tc0的上升顺序为Ru > Rh > Ir > Co > Os > Ni > Pt > Cu > Pd > Fe > Au，即当周期为第5周期时，基团数减少，Zr100 - xmx25合金的M含量降低。Zr80Rh20的高度计为4.55 K， zr75rh25的高度计为4.38 K， Zr75Ru25的高度计为4.47 K。在转变温度（TC）附近的上临界磁场（Hc2）温度梯度随着锆含量的增加而增大，由于磁通流动现象导致的电阻态在较宽的扫场范围内出现。由于峰值效应，磁通流动阻力急剧大幅下降，在hc2附近阻力急剧回升。峰效应在含铁或钴磁性元素的合金中表现得更为明显，这可能是由于在hc2附近施加高场抑制了磁散射引起的对断裂效应。Zr100−xmx合金的λthroughω和zr75m25合金的λthrough N（Ef）的变化是影响成分效应的主要因素。另外，Zr-M非晶合金的电阻率ρ(T)在2tc ~ 3TC范围内达到最大值，表明ρ(T)的驼峰现象是通过超导波动的产生而产生的。1/R250（dR/dT）定义的电阻率温度系数（tcr）在1.05×10−4 ~ 1.75×10−4K−1范围内为负值，随着tcr负值的增大，tcr随λ的增大而增大。
In order to clarify the compositional effect on the superconductivity of zirconium-transition metal (M) binary amorphous alloys, the superconducting properties and electrical resistance of the alloys were examined as functions of the concentration, group number and periodicity of the M elements.Tcfor Zr75M25alloys rises in the order Ru > Rh > Ir > Co > Os > Ni > Pt > Cu > Pd > Fe > Au, i.e. as the group number decreases when the periodicity belongs to the 5th period, and with decreasing M content for Zr100−XMXalloys. The highTcattained in the present work is 4.55 K for Zr80Rh20, 4.38 K for Zr75Rh25and 4.47 K for Zr75Ru25. The temperature gradient of the upper critical magnetic field (Hc2) near the transition temperature (TC) tends to increase with increasing zirconium content, and the resistive state due to the flux flow phenomena appears in a wide sweeping field. Following the sharp and large decrease of the flux flow resistance due to a peak effect, the resistance recovers sharply nearHc2. The peak effect was found to occur more distinctly for the alloys containing a magnetic element of iron or cobalt, probably because of the suppression of the pair-breaking effect due to magnetic scattering by the application of the high field nearHc2. The dominating factor for the compositional effect onTCis inferred to originate from the variation ofλthroughωfor Zr100−xMXalloys and from that of λ through N(Ef) for Zr75M25alloys. Additionally, it has been found for the Zr-M amorphous alloys that the electrical resistivityρ(T) exhibits a maximum value at temperature ranging from 2TCto 3TC, suggesting that the hump phenomenon in ρ(T) appeared through the generation of the superconducting fluctuations. The temperature coefficient of resistivity (tcr) defined by 1/R250(dR/dT) shows negative values ranging from 1.05×10−4to 1.75×10−4K−1andTCwas found to rise through the increase inλwith the increase in the negative value of the tcr.