Thermodynamics of the proximity effect. II. Entropies, free energies, and transition temperatures of lamellar lead-tin eutectic alloys

The McMillan tunneling model of the superconducting proximity effect has been used to calculate the specific heat jumps on the S side and on the N side of a proximity composite. The case of the BCS interaction constant on the Nside, AN being identically zero and the case of AN r 0 have both been studied. The detailed dependence of the normalized specific heat jumps on the McMillan parameters Fs and FN and on the transition temperature of the composite has been computed. A reasonable agreement between our theoretical values and recent experimental data of Bevolo et al. is obtained.

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McMillan tunneling model of the superconducting proximity effect. Specific heat jump

Mohabir

Nagi

1979

J Low Temp Phys

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Properties of proximity systems including magnetic impurities

Stephan

Ćarbotte

1991

J Low Temp Phys

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Magnetic and thermomagnetic properties of some lead—tin alloys

1981

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We have investigated the effeet of the preeipitation proeess appearing after the annealing of lead--tin alloys on the critical temperature and on the magnetic properties. We examined the occurrence of the flux-jump state, its dependence upon the precipitation and the temperature, giving a theoretical model for this process. The Nernst--Ettingshausen effect has been investigated for deepl T doped samples. We deduced the character of the electron--phonon and pinning--vortex interactions.The lead--tin metallic system almost in the entire range of concentration is a superconductor of type II.As is shown in the phase diagram (Fig. 2) the Pb--Sn system can forma solid solution from 0 to 29 at % of Sn. Decreasing the temperature, this one phase alloy is separated by the selection of Sn precipitations to a 2-phase system.This structural change appreciably influences the superconducting parameters. We investigated this process measuring the magnetisation of samplr containing 2.5; 5; 10 and 15 at% of Sn. Our cylindrical samples hada length of 60 mm anda diameter of 4 mm. The samples were prepared by the following temperation processes: 200 ~ 10rdn quenched in (iquid nitrogen A B He temperature room temperature lh Fig. 1. Temperation process *State University of Alexandria, Egypt 4 Avta Physiea .4cademiae Svientiarum Hungaricae 50, 1981

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Thermodynamics of the proximity effect. II. Entropies, free energies, and transition temperatures of lamellar lead-tin eutectic alloys

Cited by 16 publications

References 31 publications

McMillan tunneling model of the superconducting proximity effect. Specific heat jump

McMillan tunneling model of the superconducting proximity effect. Specific heat jump

Properties of proximity systems including magnetic impurities

Magnetic and thermomagnetic properties of some lead—tin alloys

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