Mosqueira J, Carballeira C, Vidal F
Laboratorio de Baixas Temperaturas e Superconductividade, Departamento de Física da Materia Condensada, Universidade de Santiago de Compostela, Santiago de Compostela E-15782, Spain.
Phys Rev Lett. 2001 Oct 15;87(16):167009. doi: 10.1103/PhysRevLett.87.167009. Epub 2001 Oct 1.
By using a Pb-18 at. % In alloy, the fluctuation induced diamagnetism was measured in the zero magnetic field limit, never observed until now in a low-T(C) superconductor. This allows us to disentangle the dynamic and the nonlocal electrodynamic effects from the short-wavelength fluctuation effects. The latter may be explained on the grounds of the Gaussian-Ginzburg-Landau approach by introducing a total energy cutoff in the fluctuation spectrum, which strongly suggests the existence of a well-defined temperature in the normal state above which all fluctuating modes vanish. This conclusion may also have implications when describing the superconducting state formation of the high-T(C) cuprates.
通过使用含18原子百分比铟的铅合金，在零磁场极限下测量了涨落感应抗磁性，这在低临界温度超导体中是迄今为止从未观察到的。这使我们能够将动态和非局域电动力学效应与短波长涨落效应区分开来。后者可以基于高斯-金兹堡-朗道方法，通过在涨落谱中引入总能量截止来解释，这有力地表明在正常态存在一个明确的温度，高于该温度所有涨落模式都将消失。这一结论在描述高温铜酸盐的超导态形成时可能也有影响。
