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Itinerant metamagnetism transition is observed and studied in perovskiteLa1-xCaxMn0.90Cu0.10O3 system for x = 0.30. At a constant low temperature, 10 K< T < 150 K, there is a continuous second-order metamagnetism jump from a lowmagnetic state to a high one with the magnetic field H increasing. However, atan exceeding low temperature, T = 2.5 K, the metamagnetism jump at H = 3.5 Tbecomes to be a robust first-order transition, and another metamagnetismtransition occurs at a higher field H = 7.0 T. Since there is no chargeordering sign in the present system, it can not be understood by using thephase separation model or the prior martensite/austenitic phase transitionscenario. A theoretical electronic nematic order phase formation is evidencedto answer for the two consecutive metamagnetic transitions, which separate thenematic phase from the low-field (H < 3.5 T) and high-field (H > 7.0 T)isotropic phases.

Itinerant metamagnetism in manganites caused by the field-induced electronic nematic order