MG-YBCO中鱼尾效应随老化的演化
Evolution of Fishtail-effect with aging in pure and Ag-doped MG-YBCO
摘要：
实验研究了$M(B)$ -曲线。在40 K ~ 75 K的温度范围内，在磁场$\textbf{H}\parallel c$方向上，观察到了YBa $_2$ Cu $_3$ O $_{7-δ}$和YBa $_2$ Cu $_{3-x}$ Ag $_x$ O $_{7-δ}$（$x \approx$为0.02）晶体的鱼尾效应.结果表明，体钉扎效应在低温下对场效应的影响更大，而表面势垒效应在高温下对场效应的影响更大。Ag掺杂晶体的值$H_{max}$大于纯晶体，这是由于存在额外的钉扎中心，尤其是在银原子上。
英文摘要：
$M(B)$-curves were experimentally investigated. Fishtail-effect (FE) was observed in MG YBa$_2$Cu$_3$O$_{7-δ}$ and YBa$_2$Cu$_{3-x}$Ag$_x$O$_{7-δ}$ (at $x \approx$ 0.02) crystals in a wide temperature range 40 K $<T<$ 75 K at the orientation of magnetic field $\textbf{H}\parallel c$. It was obtained that the influence of bulk pinning on FE is more effective at low temperatures while the influence of surface barriers is more effective at high temperatures. The value $H_{max}$ for Ag-doped crystals is larger than for a pure one that due to the presence of additional pinning centers, above all on silver atoms.
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