TY - JOUR
T1 - Structural and electrical transport properties of superconducting (formula presented) films
T2 - A random array of superconductor-normal-metal-superconductor Josephson junctions
AU - Zadorozhny, Yu
AU - Liu, Y.
PY - 2002
Y1 - 2002
N2 - The structural and superconducting properties of (formula presented) films, grown by interdiffusion of alternating Au and In layers, have been studied. The films were found to consist of a uniform solid solution of (formula presented) with excess In precipitated in the form of In-rich grains of various Au-In phases with distinct atomic compositions, including intermetallic compounds. As the temperature was lowered, these individual grains became superconducting at a particular local transition temperature (formula presented) determined primarily by the atomic composition of the grain, before a fully superconducting state of zero resistance was established. From the observed onset temperature of the superconducting transition, it was inferred that up to three different superconducting phases could have formed in these (formula presented) films, all of which were embedded in a uniform (formula presented) matrix. Among these phases, the (formula presented) of a particular one, 0.8 K, is higher than any previously reported for the Au-In system. The electrical transport properties were studied down to low temperatures. The transport results were found to be well correlated with those of the structural studies. The present work suggests that these (formula presented) films can be modeled as a random array of superconductor-normal-metal-superconductor Josephson junctions. The effect of disorder and magnetic field on the superconducting transition in these (formula presented) films is discussed.
AB - The structural and superconducting properties of (formula presented) films, grown by interdiffusion of alternating Au and In layers, have been studied. The films were found to consist of a uniform solid solution of (formula presented) with excess In precipitated in the form of In-rich grains of various Au-In phases with distinct atomic compositions, including intermetallic compounds. As the temperature was lowered, these individual grains became superconducting at a particular local transition temperature (formula presented) determined primarily by the atomic composition of the grain, before a fully superconducting state of zero resistance was established. From the observed onset temperature of the superconducting transition, it was inferred that up to three different superconducting phases could have formed in these (formula presented) films, all of which were embedded in a uniform (formula presented) matrix. Among these phases, the (formula presented) of a particular one, 0.8 K, is higher than any previously reported for the Au-In system. The electrical transport properties were studied down to low temperatures. The transport results were found to be well correlated with those of the structural studies. The present work suggests that these (formula presented) films can be modeled as a random array of superconductor-normal-metal-superconductor Josephson junctions. The effect of disorder and magnetic field on the superconducting transition in these (formula presented) films is discussed.
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U2 - 10.1103/PhysRevB.66.054512
DO - 10.1103/PhysRevB.66.054512
M3 - Article
AN - SCOPUS:85038944079
SN - 1098-0121
VL - 66
SP - 1
EP - 9
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
ER -