Spontaneous rearrangement of the checkerboard charge order to stripe order in La1.5Sr0.5NiO4
R. Kajimoto, K. Ishizaka, H. Yoshizawa, Y. Tokura
Abstract
The charge ordering in La1.5Sr0.5NiO4 has been studied with neutron diffraction technique. An interesting rearrangement of the charge ordering was observed as a function of temperature. With decreasing temperature, a checkerboard-type charge order is formed below TCO-C ~ 480 K. It is, however, taken over by the stripe-type charge order with an incommensurability twice as large as that of the spin order below TCO-IC ~ 180 K. Surprisingly, the stripe phase persists up to x = 0.7 for highly hole-doped samples of Nd2-xSrxNiO4 with 0.45 < x < 0.7.
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