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© 2020 IOP Publishing Ltd.The compound La2-2xSr1+2xMn2O7, x = 0.30 - 0.40, consists of bilayers of ferromagnetic metallic MnO2 sheets that are separated by insulating layers. The materials show colossal magnetoresistance - a reduction in resistivity of up to two orders of magnitude in a field of 7 T - at their three-dimensional ordering temperatures, TC = 90 K - 126 K, and are the layered analogues of the widely studied pseudo-cubic perovskite manganites, R1 xAxMnO3 (R = rare earth, A = Ca, Sr, Ba, Pb). Two distinct short-range orderings
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