磁场中DyBa_2Cu_3O_（7-x）单畴及其相关化合物的微波性质
Microwave properties of DyBa_2Cu_3O_(7-x) monodomains and related compounds in magnetic fields
摘要：
我们提出了一种微波表征的DyBa $_{2}$铜$_{3}$ O $_{7-x}$单域，生长的顶部籽晶熔融织构技术。我们报告的（a，b）平面场诱导的表面电阻，$ΔR_s(H)$，在48.3 GHz，测量通过一个圆柱形金属腔的端壁置换配置。腔品质因数Q随外加磁场的变化在固定温度下产生$ΔR_s(H)$。探索了[70 K ; T_c]的温度范围。沿c轴施加磁场$μ_0 H <$ 0.8 T。$ΔR_s(H)$的场依赖性不表现出陡峭的，在弱链接典型的低场阶梯状增加。这一结果表明了所研究样品的单域特征。$ΔR_s(H)$表现出对H的接近平方根的依赖性，正如通量运动所预期的那样。从分析的数据在运动的Abrikosov涡，我们估计的温度依赖性的伦敦渗透深度$λ$和涡粘度$η$，和它们的零温度值$λ(0)=$ 165 nm和$η(0)=$ 3 - 10 $^{-7}$ Nsm $^{-2}$，这是发现在良好的协议与报道的数据在YBa $_{2}$铜$_{3}$ O $_{7-x}$单晶。与相关样品的微波性质的比较表明，为了获得普遍的规律，需要报告作为T/T_c函数的数据。
英文摘要：
We present a microwave characterization of a DyBa$_{2}$Cu$_{3}$O$_{7-x}$ single domain, grown by the top-seeded melt-textured technique. We report the (a,b) plane field-induced surface resistance, $ΔR_s(H)$, at 48.3 GHz, measured by means of a cylindrical metal cavity in the end-wall-replacement configuration. Changes in the cavity quality factor Q against the applied magnetic field yield $ΔR_s(H)$ at fixed temperatures. The temperature range [70 K ; T_c] was explored. The magnetic field $μ_0 H <$ 0.8 T was applied along the c axis. The field dependence of $ΔR_s(H)$ does not exhibit the steep, step-like increase at low fields typical of weak-links. This result indicates the single-domain character of the sample under investigation. $ΔR_s(H)$ exhibits a nearly square-root dependence on H, as expected for fluxon motion. From the analysis of the data in terms of motion of Abrikosov vortices we estimate the temperature dependences of the London penetration depth $λ$ and the vortex viscosity $η$, and their zero-temperature values $λ(0)=$165 nm and $η(0)=$ 3 10$^{-7}$ Nsm$^{-2}$, which are found in excellent agreement with reported data in YBa$_{2}$Cu$_{3}$O$_{7-x}$ single crystals. Comparison of microwave properties with those of related samples indicate the need for reporting data as a function of T/T_c in order to obtain universal laws.
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