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Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

Published online by Cambridge University Press:  28 February 2011

Yening Wang ,
Linhai Sun ,
Jin Wu  and
Min Gu
Yening Wang
Affiliation:
Institute of Solid State Physics, Nanjing University, Nanjing 210008, P.R. China
Linhai Sun
Affiliation:
Institute of Solid State Physics, Nanjing University, Nanjing 210008, P.R. China
Jin Wu
Affiliation:
Institute of Solid State Physics, Nanjing University, Nanjing 210008, P.R. China
Min Gu
Affiliation:
Institute of Solid State Physics, Nanjing University, Nanjing 210008, P.R. China
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Abstract

A large thermal hysteresis ( > 100 K) of elastic modulus was measured for coarse grained Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O. Whereas, only a small thermal hysteresis (2∼3 K) near the velocity minima at 240 K, and 150 K was observed in Bi2 Sr2 CaCu2 O8 single crystal, which were found to be associated with phaselike transitions (PLT). The investigations of isothermal recovery of modulus for coarse grained YBCO and BSCCO disclose that the large thermal hysteresis may be attributed to the defects of pore size generated in the interconnecting region between grains as a result of PLT of weak first order but covering a wide temperature range. The mechanism of a large thermal hysteresis for coarse grained samples has been discussed in detail.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 321
Copyright
Copyright © Materials Research Society 1990

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References

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