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Pressure-Induced Crossover From Two- to Three-Dimensional Magnetic Correlations in La 1.4 Sr 1.6 Mn 2 O 7 Manganite

Magnetic pressure-temperature phase diagram of La 1.4 Sr 1.6 Mn 2 O 7 layered manganese oxide has been studied by neutron diffraction. Three phases have been found in this compound at ambient pressure: high-temperature phase with quasi two-dimensional correlations of the magnetic moments on Mn sites and two low-temperature phases with long-range order - antiferromagnetic and ferromagnetic. Under hydrostatic pressure the antiferromagnetic phase is favoured with respect to the two-dimensional and long-range ferromagnetic phases. The magnetic phase with two-dimensional correlations is thus suppressed by the antiferromagnetic phase with long-range order. We discuss this result in terms of the pressure-induced electron transfer and compare our conclusions with predictions given by theoretical calculations.