Rutgers relation for the analysis of superfluid density in superconductors

Article

关键词: MAGNETIC PENETRATION DEPTH;    MUON SPIN ROTATION;    UPPER CRITICAL-FIELD;    T-C SUPERCONDUCTORS;    VORTEX CORES;    NIOBIUM;    TEMPERATURE;    EXCITATIONS;    CRYSTALS;    MGB2;   

DOI  :  10.1103/PhysRevB.87.214518

来源: SCIE

【 摘 要 】

It is shown that the thermodynamic Rutgers relation for the second-order phase transitions can be used for the analysis of the superfluid density data irrespective of complexities of the Fermi surface, structure of the superconducting gap, pairing strength, or scattering. The only limitation is that critical fluctuations should be weak so that the mean-field theory of the second-order phase transitions is applicable. By using the Rutgers relation, the zero-temperature value of the London penetration depth lambda(0) is related to the specific heat jump Delta C and the slope of upper critical field dH(c2)/dT at the transition temperature T-c, provided the data on Delta lambda = lambda(T) - lambda(0) are available in a broad temperature domain. We then provide a way to determine lambda(0), the quantity difficult to determine within many techniques.

【 授权许可】

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