Hall magnetometry measurements of bulk single crystalline rings of YBa2Cu3O7
نویسندگان
چکیده
The I-V characteristics of YBa2Cu3O7 rings are measured down to the subpicovolt level using a Hall magnetometry technique. Non-Ohmic response of the rings to an ac magnetic field is detected below a temperature TG . Fourier analysis of the data demonstrates appearance of higher harmonics up to order 9. The frequency and amplitude dependence of the harmonic susceptibilities is analyzed. The quasistatic I-V response of the ring is obtained after using a triangular wave form, providing conclusive evidence for the vortex-glass phase transition in twinned crystals. Different techniques are employed to improve the resolution of the method, including use of different semiconducting materials and use of a bridge circuit. The resolution achieved is 0.006 G/AHz in a field of 1 T, corresponding to a relative resolution of 1310 and a magnetic moment of 5310 emu. @S0163-1829~98!08237-X#
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