Stripe order at low temperatures in La2-xSrxNiO4 for 1/3 < x < 1/2
H. Yoshizawa, T. Kakeshita, R. Kajimoto, T. Tanabe, T. Katsufuji, Y. Tokura
Abstract
Stripe order in La2-xSrxNiO4 beyond x = 1/3 was studied with neutron scattering technique. At low temperatures, all the samples exhibit hole stripe order. Incommensurability εof the stripe order is approximately linear in the hole concentration nh = x + 2δup to x = 1/2, where δdenotes the off-stoichiometry of oxygen atoms. The charge and spin ordering temperatures exhibit maxima at nh = 1/3, and both decrease beyond nh > 1/3. For 1/3 < nh < 1/2, the stripe ordering consists of the mixture of the ε= 1/3 stripe order and the nh = 1/2 charge/spin order.
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