Irreversibility temperatures in superconducting oxides: The flux-line-lattice melting, the glass-liquid transition, or the depinning temperatures.
Irreversibility temperatures in superconducting oxides: The flux-line-lattice melting, the glass-liquid transition, or the depinning temperatures.
复制标题
超导氧化物中的不可逆温度：磁通线晶格熔化、玻璃液转变或脱钉温度。
DOI：
10.1103/physrevb.43.5516
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Suenaga
中科院分区：
文献类型：
--
作者：
Xu;Suenaga
不可逆温度的磁场依赖关系遵循H=a[1-${\mathit{T}}_{\mathit{r}}$(H)/${\mathit{T}}_{\mathit{c}}$(0)${]}^{\mathit{n}}$关系，n为1.5，对于x=0和0.02的纯和合金化${\mathrm{YBa}}_{2}$(${\mathrm{Cu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{M}}_{\mathit{x}}$${)}_{3}$${\mathrm{O}}_{7+\mathrm{\ensuremath{\delta}}}$，其中M=Al、Fe、Ni和Zn，在平行于c轴的外加磁场下测量。然而，对于M=Ni和x=0.04和0.06，n\保证数学{\simeq}2.0。这一关系不适用于${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$或(Bi，Pb${)}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10}$)粉末。研究还表明，纯${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$.和合金化的磁滞回线的不可逆温度是磁滞宽度M的强函数这些结果和对这些样品的磁通蠕变的测量表明，{\mathit{T}}_{\mathit{r}}$(H)是脱钉线，而不是晶格熔化或玻璃到液体的相变温度。然而，传统的磁通蠕变模型不能解释所有观测到的M(T)的时间依赖关系。
The magnetic-field dependence of the irreversibility temperatures follows an H=a[1-${\mathit{T}}_{\mathit{r}}$(H)/${\mathit{T}}_{\mathit{c}}$(0)${]}^{\mathit{n}}$ relationship with n\ensuremath{\simeq}1.5, for pure and alloyed ${\mathrm{YBa}}_{2}$(${\mathrm{Cu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{M}}_{\mathit{x}}$${)}_{3}$${\mathrm{O}}_{7+\mathrm{\ensuremath{\delta}}}$ with x=0 and 0.02, where M=Al, Fe, Ni, and Zn, measured for an applied field parallel to the c axis. However, for M=Ni and x=0.04 and 0.06, n\ensuremath{\simeq}2.0. This relationship is not applicable for either ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ or (Bi,Pb${)}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{10}$ powders. It is also shown that the irreversibility temperature is a strong function of the magnetic hysteresis width \ensuremath{\Delta}M for pure and alloyed ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$. These results and the measurements of the flux creep \ensuremath{\Delta}M(t) for these specimens suggest that ${\mathit{T}}_{\mathit{r}}$(H) is a depinning line rather than a lattice melting or glass-to-liquid phase-transition temperature. However, the conventional flux-creep model cannot account for all of the observed temporal dependences of \ensuremath{\Delta}M(t).