Abstract
A large magnetoresistive (MR) effect was observed in melt-textured (MT) Bi2212 in which USr2CaO6 was added in a proportion of 6wt%. The resistivity measurements of MT Bi2212+6wt% USr2CaO6 show high sensitivity to applied dc fields, as compared to pure Bi2212, in particular at low fields, below 3T, and in a temperature range between 45K and 85K. In this temperature range, the MR effect of MT Bi2212+6wt% USr2CaO6 is two orders of magnitude larger than the MR effect in pure Bi2212, and display a maximum that may be tuned to a particular temperature within the above range, by changing the amount of added nonsuperconducting compound. A cryogenic sensor was built and tested at 77K in low fields. It shows a good sensitivity and small (∼1%) hysteresis of resistivity when the applied field was cycled between 0T and 1T.
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