FIELD-INDUCED STAGGERED MAGNETIC ORDER IN LA2NIO4.133

At low temperature the holes doped into the NiO2 planes of La2NiO4.133 by the excess oxygen collect in diagonal stripes that separate narrow antiferromagnetic domains. The magnetic order drops abruptly to zero at T-m=110.5 K, but charge order remains with a period of 3/2a. We sho w that application of a magnetic field in the regime T>T-m induces sta ggered magnetic order of period 3a due to the net magnetic moment of t he high-temperature bond-centered stripes, together with the odd numbe r of Ni spins across an antiferromagnetic domain.