Scanning SQUID Microscopy of Local Superconductivity in Inhomogeneous Combinatorial Ceramics

Although combinatorial solid‐state chemistry promises to be an efficient way to search for new superconducting compounds, the problem of determining which compositions are strongly diamagnetic in a mixed‐phase sample is challenging. By means of reactions in a system of randomly mixed starting compon...

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Bibliographic Details
Published in:Chemistry : a European journal 2014-11, Vol.20 (48), p.15816-15823
Main Authors: Iranmanesh, Mitra, Stir, Manuela, Kirtley, John R., Hulliger, Jürg
Format: Article
Language:English
Subjects:
Ceramics
Chemistry
Combinatorial analysis
combinatorial chemistry
Diamagnetism
magnetic properties
Microscopy
Scanning
scanning probe microscopy
SQUIDs
Superconducting quantum interference devices
Superconductivity
superconductors
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Summary:Although combinatorial solid‐state chemistry promises to be an efficient way to search for new superconducting compounds, the problem of determining which compositions are strongly diamagnetic in a mixed‐phase sample is challenging. By means of reactions in a system of randomly mixed starting components (Ca, Sr, Ba, La, Y, Pb, Bi, Tl, and Cu oxides), samples were produced that showed an onset of diamagnetic response above 115 K in bulk measurements. Imaging of this diamagnetic response in ceramic samples by scanning SQUID microscopy (SSM) revealed local superconducting areas with sizes down to as small as the spatial resolution of a few micrometers. In addition, locally formed superconducting matter was extracted from mixed‐phase samples by magnetic separation. The analysis of single grains (d
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201403065