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Title: Superconducting diamagnetism is samples of (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/

Abstract

The highly anisotropic metals (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/ have shown low temperature behavior which could be associated with unusual superconducting properties. The present susceptibility measurements, made using a very sensitive SQUID magnetometer, were undertaken to add to the understanding of these new materials and to investigate the nature of superconductivity in the unusual systems which these materials present. While previous work has indicated a distinctly one-dimensional character of the superconductivity of (SN)/sub x/, the present magnetic studies show - by the observation of a Meissner effect - that the superconductivity below 200 mK is three - dimensional. The results suggest a coupling transition in which individual fibers, superconducting below about 300 mK, become superconductively coupled at a lower temperature give phase coherence throughout a bulk sample. The result is supported by the unusual field and temperature dependences of the ac and dc susceptibilities and by the observation of a penetration depth which is comparable to the diameter of the crystals. A similiar coupling transition is observed in brominated (SN)/sub x/, in which the fibers are found to be somewhat more strongly coupled. While such a transition has been predicted theoretically, this is the first observation of amore » fiber to bulk coupling transition. The present work is consistent with the observations of others, and explains some of the more puzzling features of previous work. The primary result of the investigation of samples of TaSe/sub 3/ and NbSe/sub 3/ is the observation of superconducting diamagnetism and flux trapping indicating long range, stable superconducting phase coherence in the samples.« less

Authors:
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (USA)
OSTI Identifier:
6132899
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; METALS; MAGNETIC SUSCEPTIBILITY; SUPERCONDUCTIVITY; NIOBIUM SELENIDES; TANTALUM SELENIDES; DIAMAGNETISM; EXPERIMENTAL DATA; MAGNETIC FLUX; PENETRATION DEPTH; SQUID DEVICES; TEMPERATURE DEPENDENCE; CHALCOGENIDES; DATA; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; FLUXMETERS; INFORMATION; MAGNETIC PROPERTIES; MAGNETISM; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; NIOBIUM COMPOUNDS; NUMERICAL DATA; PHYSICAL PROPERTIES; SELENIDES; SELENIUM COMPOUNDS; SUPERCONDUCTING DEVICES; TANTALUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Bastuscheck, C M. Superconducting diamagnetism is samples of (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/. United States: N. p., 1980. Web.
Bastuscheck, C M. Superconducting diamagnetism is samples of (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/. United States.
Bastuscheck, C M. 1980. "Superconducting diamagnetism is samples of (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/". United States.
@article{osti_6132899,
title = {Superconducting diamagnetism is samples of (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/},
author = {Bastuscheck, C M},
abstractNote = {The highly anisotropic metals (SN)/sub x/, TaSe/sub 3/ and NbSe/sub 3/ have shown low temperature behavior which could be associated with unusual superconducting properties. The present susceptibility measurements, made using a very sensitive SQUID magnetometer, were undertaken to add to the understanding of these new materials and to investigate the nature of superconductivity in the unusual systems which these materials present. While previous work has indicated a distinctly one-dimensional character of the superconductivity of (SN)/sub x/, the present magnetic studies show - by the observation of a Meissner effect - that the superconductivity below 200 mK is three - dimensional. The results suggest a coupling transition in which individual fibers, superconducting below about 300 mK, become superconductively coupled at a lower temperature give phase coherence throughout a bulk sample. The result is supported by the unusual field and temperature dependences of the ac and dc susceptibilities and by the observation of a penetration depth which is comparable to the diameter of the crystals. A similiar coupling transition is observed in brominated (SN)/sub x/, in which the fibers are found to be somewhat more strongly coupled. While such a transition has been predicted theoretically, this is the first observation of a fiber to bulk coupling transition. The present work is consistent with the observations of others, and explains some of the more puzzling features of previous work. The primary result of the investigation of samples of TaSe/sub 3/ and NbSe/sub 3/ is the observation of superconducting diamagnetism and flux trapping indicating long range, stable superconducting phase coherence in the samples.},
doi = {},
url = {https://www.osti.gov/biblio/6132899}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}

Thesis/Dissertation:
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