R.P. Robertazzi, R.H. Koch, et al.
IEEE TAS
We present an improved contactless technique that allows measurement of the current-voltage (I-V) curves of YBa2Cu3O7-x single crystals in large magnetic fields with 5 orders of magnitude improved voltage resolution compared to conventional transport measurements. The crystals are shaped in the form of rings. The I-V curves are obtained by applying a small triangular oscillation of magnetic field and measuring the induced current in the ring using a local Hall probe. The magnetic field resolution achieved is 1 ppm. The I-V curves are obtained very close to the glass transition temperature TG, down to voltage levels of 0.1 pV, and show the characteristic change of slope on a log-log plot typical of a glassy transition. © 1995 The American Physical Society.
R.P. Robertazzi, R.H. Koch, et al.
IEEE TAS
J.G. Deak, R.H. Koch, et al.
IEEE Transactions on Magnetics
B. Billon, M. Charalambous, et al.
Physical Review B - CMMP
C. Dekker, P.J.M. Wöltgens, et al.
Physical Review Letters