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Nonlinear magnetic response to an AC excitation field are examined for κ-(BEDT-TTF) 2 Cu(NCS) 2 at zero external DC field. Temperature dependence of M′ 3ω , the third-harmonic in-phase component, depends strongly on field amplitude h and also on sample preparation. At a weak field amplitude of h < 0.1 Oe, however, it shows a common positive peak around 9 K, indicating a...