分析非常规超导体场角分辨测量的Kramer-Pesch近似：零态能量密度的计算
Kramer-Pesch approximation for analyzing field-angle-resolved measurements made in unconventional superconductors: A calculation of the zero-energy density of states
摘要：
通过测量相对于所施加的场方向的热容的角振荡行为，可以检测间隙结构的细节。我们引入Kramer-Pesch近似（KPA）作为一种新的方法来定量分析场角相关实验。我们计算了典型费米面和超导带隙的各种组合的零态能量密度。KPA产生的优点，人们可以定量比较理论计算与实验结果，而不涉及繁重的数值计算，即使是复杂的费米表面。我们表明，经常使用的多普勒频移技术的不足，这是补救的KPA的应用。
英文摘要：
By measuring angular-oscillation behavior of the heat capacity with respect to the applied field direction, one can detect the details of the gap structure. We introduce the Kramer-Pesch approximation (KPA) as a new method to analyze the field-angle-dependent experiments quantitatively. We calculate the zero energy density of states for various combinations of typical Fermi surfaces and superconducting gaps. The KPA yields a merit that one can quantitatively compare theoretical calculations with experimental results without involving heavy numerical computations, even for complicated Fermi surfaces. We show an inadequacy of the frequently-used Doppler-shift technique, which is remedied by application of the KPA.
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