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朱士群 《苏州大学学报(医学版)》1990,6(2):195-199
Effects of multiplicatioe noise in transient laser intensity are investigated theoretically. Analytic solutions are calculated through a reduced Fokker-Planck equation and the results with different pump parameters are discussed. 相似文献
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A C3Cl-type(bcc)-semi-infinite ferrimagnet with a single-ion uniaxial anisotropy and a magnetic impurity layer is considered through combining Green‘s function theory with the transfer-mairx method.The effect of the anisotropy term and the impurity layer on surface spin wave specirum is discussed.The influence of the impurity layer‘s distance from the surface or surface spin woves is also concerned. 相似文献
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Homes CC Dordevic SV Strongin M Bonn DA Liang R Hardy WN Komiya S Ando Y Yu G Kaneko N Zhao X Greven M Basov DN Timusk T 《Nature》2004,430(6999):539-541
Since the discovery of superconductivity at elevated temperatures in the copper oxide materials there has been a considerable effort to find universal trends and correlations amongst physical quantities, as a clue to the origin of the superconductivity. One of the earliest patterns that emerged was the linear scaling of the superfluid density (rho(s)) with the superconducting transition temperature (T(c)), which marks the onset of phase coherence. This is referred to as the Uemura relation, and it works reasonably well for the underdoped materials. It does not, however, describe optimally doped (where T(c) is a maximum) or overdoped materials. Similarly, an attempt to scale the superfluid density with the d.c. conductivity (sigma(dc)) was only partially successful. Here we report a simple scaling relation (rho(s) proportional, variant sigma(dc)T(c), with sigma(dc) measured at approximately T(c)) that holds for all tested high-T(c) materials. It holds regardless of doping level, nature of dopant (electrons versus holes), crystal structure and type of disorder, and direction (parallel or perpendicular to the copper-oxygen planes). 相似文献
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