Spontaneous rearrangement of the checkerboard charge order to stripe order in La1.5Sr0.5NiO4

Details Spontaneous rearrangement of the checkerboard charge order to stripe order in La1.5Sr0.5NiO4 Spontaneous rearrangement of the checkerboard charge order to stripe order in La1.5Sr0.5NiO4

2002-02-18

arxiv.org/abs/cond-mat/0202288v2

Phys. Rev. B 67, 014511 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX4, 5 pages, 5 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.014511

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 T{CO-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 T{CO-IC} ~ 180 K. Surprisingly, the stripe phase persists up to x = 0.7 for highly hole-doped samples of Nd{2-x}Sr{x}NiO{4} with 0.45 < x < 0.7.

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