Giant nonlinear response of superconducting single crystal niobium in a sweeping magnetic field

Details Giant nonlinear response of superconducting single crystal niobium in a sweeping magnetic field Giant nonlinear response of superconducting single crystal niobium in a sweeping magnetic field

2001-09-23

arxiv.org/abs/cond-mat/0109425v1

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures, presented to EUCAS 2001

Scientific paper

Giant enhancement of the nonlinear response of a single crystal of Nb placed in a sweeping magnetic field has been experimentally observed. The rectified signal from Nb ($Tc=9.15$ K) has been measured by means of an inductive method as a function of temperature, dc field, dc field sweep rate, and the amplitude of ac field. The Nb sample was excited by an amplitude modulated ac field. Under a stationary regime, the rectified signal appears only for magnetic fields ($H_0$) in the range $H_{c2}H_{c1}$. This experiment shows that the amplitude of the rectified signal is two orders of magnitude larger than the amplitude of the signal seen under stationary field conditions. Moreover, the amplitude of the rectified signal is a power function of the sweep rate, with the power exponent close to 1.

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