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61. Synthesis and Characterization of Superconducting Electronic Materials.

Author

MASSACHUSETTS INST OF TECH CAMBRIDGE FRANCIS BITTER NATIONAL MAGNET LAB, Meservey,R H, Tedrow,P M, Orlando,T P, MASSACHUSETTS INST OF TECH CAMBRIDGE FRANCIS BITTER NATIONAL MAGNET LAB, Meservey,R H, Tedrow,P M, and Orlando,T P

Abstract

Specialized vacuum deposition systems were developed with the necessary monitoring and control to synthesize or react refractory superconducting films. NbN, VN, NbTi, and VTi films of high quality have been produced and their transport and tunneling properties studied. Ultra-thin films of pure Nb have been successfully made to study spin-orbit scattering in transition metals. The structural properties and penetration depth of NbN films prepared by reactive sputtering have been studied. Many-body effects which are important in superconductivity have been observed by spin-polarized tunneling and the antisymmetric Fermi liquid parameter has been measured for the first time in Al. The technique of deconvoluting tunneling conductance curves to obtain the superconducting density of states has been improved. A comprehensive study was made of amorphous Ge tunnel barriers between superconductors. (Author).

Published
1984

62. Synthesis and Study of Materials for Superconducting Electronics.

Author

MASSACHUSETTS INST OF TECH CAMBRIDGE, Tedrow, P M, Meservey, R, Orlando, T P, MASSACHUSETTS INST OF TECH CAMBRIDGE, Tedrow, P M, Meservey, R, and Orlando, T P

Abstract

Study of high-Tc superconductors in single-crystal and thin film form has begun. Investigation of semiconductor tunnel barriers has led to improvement of their theoretical description. Transport measurements of layered films of transition metal nitrides showed evidence of spin-orbit scattering and dimensional crossover effects. A technique for analyzing tunneling conductances to obtain the amount of Zeeman splitting using Fourier transforms has been developed and applied to V3Ga tunneling data. Spin-orbit scattering rates measured by two independent techniques, spin-polarized tunneling and magnetoresistance, have been shown to be similar. The strength of Fermi-liquid corrections on the effective magnetic moment of conduction electrons in vanadium and gallium has been found using spin-polarized tunneling. The effect of spin-orbit scattering on the density of states of superconducting thin films has been measured. The superconducting properties of ultra-thin niobium films were studied.

Published
1988

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