Hall-effect in LuNi_2B_2C in normal and superconducting mixed states


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The Hall resistivity rho_{xy} of LuNi_2B_2C is negative in the normal as well as in the mixed state and has no sign reversal typical for high-T_c superconductors. A distinct nonlinearity in the rho_{xy} dependence on field H was found in the normal state for T < 40K, accompanied by a large magnetoresistance reaching +90% for mu_0H=16T at T=20K. The scaling relation rho_{xy} ~ rho_{xx}^beta (rho_{xx} is the longitudinal resistivity) was found in the mixed state, the value of beta being dependent on the degree of disorder.

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