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Neutron Depolarization by Flux Latrices in High-TC Materials

Published online by Cambridge University Press:  21 February 2011

S. J. Pickart ,
A. C. Nunes ,
M. L. Crow ,
Bo Fu ,
T. R. McGuire ,
S. Shinde  and
S. A. Shivashankar
S. J. Pickart
Affiliation:
University of Rhode Island, Department of Physics, Kingston, RI 02881
A. C. Nunes
Affiliation:
University of Rhode Island, Department of Physics, Kingston, RI 02881
M. L. Crow
Affiliation:
University of Rhode Island, Department of Physics, Kingston, RI 02881
Bo Fu
Affiliation:
University of Rhode Island, Department of Physics, Kingston, RI 02881
T. R. McGuire
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
S. Shinde
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
S. A. Shivashankar
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598
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Abstract

We have recently reported[l] neutron depolarization measurements on an YBa2Cu3O7−δ composition exhibiting a transition from a low temperature state which caused depolarization (P=0.76+−.02) to one at high temperatures (T=55K) where depolarization was absent. Since this temperature is well below the measured superconducting transition at 86K, we speculated that the transition was a dynamic one corresponding to flux lattice melting[2] or to formation of a glassy state[3]. We have now extended these depolarization measurements to two specimens of Bi2.2Sr1.7CaCu2O8+δ' prepared and characterized[4] at IBM, which showed superconducting transitions at 80K with weak tails extending to 110K. The two samples have critical current densities, as determined by the Bean expression[5], that differ by 50%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 193
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Crow, M.L., Goyette, R.J., Nunes, A.C., Pickart, S.J., McGuire, T.R., Shinde, S., and Shaw, T.M., J. Appl. Phys. 64, 5815 (1988); Proc. 34th Conf. on Magnetism and Magnetic Matls. (to be published).Google Scholar
2. Nelson, D.R., Phys Rev. Lett. 60, 1973 (1988); P.L. Gammel, L.F. Schneemeyer, J.V. Waszczak, and D.J. Bishop, Phys. Rev. Lett. 61, 1666 (1988).CrossRefGoogle Scholar
3. Fisher, M.P.A., Phys. Rev. Lett. 62, 1415 (1989).Google Scholar
4. McGuire, T.R., Shivashankar, S.A., LaPlaca, S.J., Chandrashekhar, G.V., Boehme, R.F., Shaw, T.M., Yee, D.S., Shafer, M.W., and Cuomo, J.J., J. Appl. Phys. 64, 5792 (1988).Google Scholar
5. Bean, C.P., Phys. Rev. Lett. 8, 250 (1962).CrossRefGoogle Scholar