Fig. 1: Physical properties and order parameter of La4Ni3O10.

ab-plane (a), resistivity in zero field and (b), magnetic susceptibility measured under 0.4 T upon cooling and warming. c Heat capacity. Inset shows fit to low temperature data. d Temperature dependence of integrated intensity at (1, 2.24, 0) measured with x-rays. e Temperature dependence of integrated intensity at (−1, 0.38, 0) measured with neutrons. Error bars represent one standard deviation.