Free energy and torque for superconductors with different anisotropies of H(c2) and lambda.
Free energy and torque for superconductors with different anisotropies of H(c2) and lambda.
复制标题
具有不同 H(c2) 和 lambda 各向异性的超导体的自由能和扭矩。
DOI：
10.1103/physrevlett.89.237005
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发表时间：
2002
影响因子：
8.6
通讯作者：
V. Kogan
中科院分区：
文献类型：
--
作者：
V. Kogan
利用上临界场的各向异性γ (H)=H(c2,a)/H(c2,c)，不同于穿透深度的各向异性γ (lambda)=lambda(c)/lambda(a)，计算了单轴超导体的自由能。随着伽马(H)和伽马（lambda）之间的差值的增加，晶体相对于应用场的平衡方向可能从θ =pi/2 （θ是场与c轴之间的角度）向较低的角度移动，并在足够大的伽马(H)时达到θ =0。这些效应预计会发生在MgB2中。
The free energy is evaluated for a uniaxial superconductor with the anisotropy of the upper critical field, gamma(H)=H(c2,a)/H(c2,c), different from the anisotropy of the penetration depth gamma(lambda)=lambda(c)/lambda(a). With increasing difference between gamma(H) and gamma(lambda), the equilibrium orientation of the crystal relative to the applied field may shift from theta=pi/2 (theta is the angle between the field and the c axis) to lower angles and reach theta=0 for large enough gamma(H). These effects are expected to take place in MgB2.