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Neutron Depolarization by Flux Latrices in High-TC Materials

  • S. J. Pickart (a1), A. C. Nunes (a1), M. L. Crow (a1), Bo Fu (a1), T. R. McGuire (a2), S. Shinde (a2) and S. A. Shivashankar (a2)...

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%.

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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).
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).
3. Fisher, M.P.A., Phys. Rev. Lett. 62, 1415 (1989).
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).
5. Bean, C.P., Phys. Rev. Lett. 8, 250 (1962).

Neutron Depolarization by Flux Latrices in High-TC Materials

  • S. J. Pickart (a1), A. C. Nunes (a1), M. L. Crow (a1), Bo Fu (a1), T. R. McGuire (a2), S. Shinde (a2) and S. A. Shivashankar (a2)...

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