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We report the third harmonics of the AC susceptibility in the itinerant-electron metamagnetic compound UCoAl. The third harmonics χ3 shows a sharp peak near the critical point of the metamagnetic transition line although a critical divergence toward the critical point is absent. The critical point can be determined as the onset of the peak in χ3 , which is sharper than the peak in the fundamental component of the AC susceptibility, χ1 . This result suggests that the measurement of χ3 can be a new tool for the determination of the quantum critical point in itinerant-electron metamagnetic system.

Third-order magnetic-susceptibility of itinerant-electron metamagnet UCoAl