Hall-effect in LuNi2B2C in normal and superconducting mixed states

Abstract

The Hall resistivity ρ xy of LuNi 2 B 2 C 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 ρ xy dependence on field H was found in the normal state for T < ∼ 40 K, accompanied by a large magnetoresistance reaching +90%for µ 0 H = 16 T at T = 20 K. The scaling relation ρ xy ∼ ρ β xx (ρ xx is the longitudinal resistivity) was found in the mixed state, the value of β being dependent on the degree of disorder.

Field-induced magnetic phase transitions and correlated electronic states in the hexagonal RAgGE and RPtIn series

“…Similarly small couplings of local moment magnetism with the Hall effect has been seen in other rare earth intermetallics, e.g. RNizBzC (R = rare earth) borocarbides (Fisher, 1995;Mandal, 1997;Narozhnyi, 1999).…”

Physical properties of Lu1−xYbxNi2B2C

“…The in-plane (ab-plane) thermopower S(T ) of LuNi 2 B 2 C is negative and has a magnitude of the order of 10 mV/K at 300 K, which is consistent with a temperatureindependent negative Hall coefficient R H [20,21]. The magnitude of S decreases with T from room temperature down to T c where S falls to zero, similar to all of the other superconducting RNi 2 B 2 C compounds [20].…”