Abstract
Crystal and magnetic structure, physical properties (heat capacity, electrical resistivity, magnetic ac-susceptibility) of the ordered double manganite PrBaMn2O6 under high external pressure are presented for the first time. Powder neutron diffraction and measurements of physical properties are performed at external pressure up to 5.2 GPa in the temperature interval 50–320 K. Unit cell parameters are determined, the magnetic moment of manganese atoms is calculated with full-profile analysis, linear and volume compression coefficients are estimated. According to the neutron diffraction analysis, the material becomes A-type antiferromagnetic insulator at external pressure, while the measurements of physical properties reveal weak signal of the conducting ferromagnetic state. This discrepancy is explained by a presence of ferromagnetic conducting clusters in the antiferromagnetic insulator matrix. The NMR data confirm such an explanation as two contributions from ferromagnetic and antiferromagnetic fractions at ambient pressure have been detected.
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