Field-induced staggered magnetic order inLa2NiO4.133

At low temperature the holes doped into the ${\mathrm{NiO}}_2$ planes of ${\mathrm{La}}_2$ ${\mathrm{NiO}}_{4.133}$ by the excess oxygen collect in diagonal stripes that separate narrow antiferromagnetic domains. The magnetic order drops abruptly to zero at ${\mathrm{T}}_{\mathrm{m}}$=110.5 K, but charge order remains with a period of a. We show that application of a magnetic field in the regime T>${\mathrm{T}}_{\mathrm{m}}$ induces staggered magnetic order of period 3a due to the net magnetic moment of the high-temperature bond-centered stripes, together with the odd number of Ni spins across an antiferromagnetic domain.