Comparative study of global and local magnetization measurements on single crystalline high-Tc superconductors

M. Werner, G. Brandstätter, F. M. Sauerzopf, H. W. Weber, A. Hoekstra, R. Surdeanu, R. J. Wijngaarden, R. Griessen, Y. Abulafia, Y. Yeshurun, K. Winzer, B. W. Veal

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Abstract

The mixed state of several (RE)Ba2Cu3O7-δ single crystals (RE = Y,Yb) was investigated by various measuring techniques. Using an 8 T SQUID magnetometer as a reference, we compare the current densities evaluated from global magnetization measurements (SQUID, torque and VSM) and from a local technique (Hall probe array). Taking the specific time scales of the various measurements into consideration, we obtain excellent agreement at all temperatures from 5 to 77 K. Magneto-optical images of the flux density gradients confirm that the current densities can be calculated on the basis of an extended Bean model. The established correspondence between global and local techniques is of fundamental relevance for future experimental work on the subject.

Original languageEnglish
Pages (from-to)191-201
Number of pages11
JournalPhysica C: Superconductivity and its Applications
Volume303
Issue number3-4
DOIs
StatePublished - 20 Jul 1998

Bibliographical note

Funding Information:
This work was supported in part by the Austrian Ministry of Research and Transport under contract No. 185/3-IV/6/94 and by the HCM program of the European Union. One of us (M.W.) wishes to thank R. Griessen and Y. Yeshurun for their great hospitality during his stays at the Vrije Universiteit in Amsterdam and at Bar Ilan University, Israel. H.W.W and Y.Y. acknowledge support through an Austrian–Israeli Exchange Program administered by the Ministry of Science and Technology. Y.Y. acknowledges support from the Heinrich Hertz Minerva Center for High Temperature Superconductivity and the Israel Science Foundation. Work at Argonne National Laboratory was supported by the U.S. Department of Energy under contract No. W-31-109-ENG-38.

Keywords

  • Hall probe array
  • SQUID
  • Torque magnetometer

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