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Title: Magnetic susceptibility and contactless resistivity measurements of percolating superconductivity in tin-doped bismuth

Abstract

Magnetic susceptibility and contactless resistivity measurements were undertaken to determine whether or not the zero-resistance transitions seen previously in tin- and tellurium-doped bismuth were evidence of bulk superconductivity in these systems. An improved technique has been developed which extracts both the magnetic susceptibility and resistivity of a sample from the in-phase and quadrature components of an ac mutual inductance measurement. High sensitivity is achieved by a careful design and by using a bridge circuit with a SQUID (superconducting quantum interference device) as a null detector. This allows the use of small ac excitation fields (50 ..mu..Oe, p-p) for observing weakly coupled superconducting networks which are sensitive to probing fields. The results of this investigation suggest that tin-doped bismuth is not a bulk superconductor but is, instead, an interesting example of an inhomogeneous superconductor comprised of segregated and randomly distributed tin grains in a semimetal matrix. Superconductivity originating at the tin sites, appears to propagate via proximity effect and weak-link coupling causing broad transitions which extend from about 0.6K to approximately 12 mK or lower.

Authors:
Publication Date:
Research Org.:
Michigan Univ., Ann Arbor (USA)
OSTI Identifier:
5427431
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH; SUPERCONDUCTIVITY; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; EXPERIMENTAL DATA; MAGNETIC SUSCEPTIBILITY; PROXIMITY EFFECT; TIN; DATA; ELECTRICAL PROPERTIES; ELEMENTS; INFORMATION; MAGNETIC PROPERTIES; MATERIALS; METALS; NUMERICAL DATA; PHYSICAL PROPERTIES; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Elzinga, M B. Magnetic susceptibility and contactless resistivity measurements of percolating superconductivity in tin-doped bismuth. United States: N. p., 1984. Web.
Elzinga, M B. Magnetic susceptibility and contactless resistivity measurements of percolating superconductivity in tin-doped bismuth. United States.
Elzinga, M B. Sun . "Magnetic susceptibility and contactless resistivity measurements of percolating superconductivity in tin-doped bismuth". United States.
@article{osti_5427431,
title = {Magnetic susceptibility and contactless resistivity measurements of percolating superconductivity in tin-doped bismuth},
author = {Elzinga, M B},
abstractNote = {Magnetic susceptibility and contactless resistivity measurements were undertaken to determine whether or not the zero-resistance transitions seen previously in tin- and tellurium-doped bismuth were evidence of bulk superconductivity in these systems. An improved technique has been developed which extracts both the magnetic susceptibility and resistivity of a sample from the in-phase and quadrature components of an ac mutual inductance measurement. High sensitivity is achieved by a careful design and by using a bridge circuit with a SQUID (superconducting quantum interference device) as a null detector. This allows the use of small ac excitation fields (50 ..mu..Oe, p-p) for observing weakly coupled superconducting networks which are sensitive to probing fields. The results of this investigation suggest that tin-doped bismuth is not a bulk superconductor but is, instead, an interesting example of an inhomogeneous superconductor comprised of segregated and randomly distributed tin grains in a semimetal matrix. Superconductivity originating at the tin sites, appears to propagate via proximity effect and weak-link coupling causing broad transitions which extend from about 0.6K to approximately 12 mK or lower.},
doi = {},
url = {https://www.osti.gov/biblio/5427431}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

Thesis/Dissertation:
Other availability
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