Structural and magnetic phase transitions in Pr0.15Sr0.85MnO3 at high pressure
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The crystal and magnetic structures of Pr0.15Sr0.85MnO3 manganite have been studied by means of powder X-ray and neutron diffraction in the temperature range 10–400 K at high external pressures up to 55 and 4 GPa, respectively. A structural phase transition from cubic to tetragonal phase upon compression was observed, with large positive pressure coefficient of transition temperature dT ct /dP = 28(2) K/GPa. The C-type antiferromagnetic (AFM) ground state is formed below T N ≈ 260 K at ambient pressure. While at ambient pressure the structural and magnetic transition temperatures are close, T ct ~ T N , upon compression they become decoupled with T N ≪ T ct due to much weaker T N pressure dependence with coefficient dT N /dP = 3.8(1) K/GPa.
KeywordsManganite Structural Phase Transition Magnetic Phase Transition Magnetic Phase Diagram High External Pressure
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