Magnetic phase diagram of the charge ordered manganite Pr{sub 0.8}Na{sub 0.2}MnO{sub 3}

Journal Article · Fri Jun 01 04:00:00 EDT 2001 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1358345· OSTI ID:40204074

Hejtmanek, J; Jirak, Z; Sebek, J; Strejc, A; Hervieu, M

Pr{sub 1{minus}x}Na{sub x}MnO{sub 3} solid solutions up to x=0.25 were prepared. Irrespective of magnetic order all samples are electrically insulating. The Curie temperature is maximum at T{sub C}=125 K for x=0.15; the samples with x{ge}0.2 are charge-ordered antiferromagnets. The x=0.2 antiferromagnetic charge-ordered insulator (AFCO) can be switched to the ferromagnetic metallic state (FMM) by application of a relatively weak external magnetic field. This is accompanied by a huge CMR effect, irreversible at low temperatures. The neutron diffraction data, which show a decoupling of charge order (T{sub CO}=215 K) and long range AF order of the {open_quotes}pseudo{close_quotes} CE (T{sub N}=175 K), are supported by specific heat measurement. The specific heat at 14 T confirmed the transformation of the x=0.2 sample to FMM state and the nature of the AFCO{endash}FMM transition was probed by magnetic moment and electrical resistivity relaxation measurements. This comprehensive characterization of the sample led to a complete determination of the magnetic phase diagram which demonstrated the near degeneracy of the ferro- and antiferromagnetic ground states in Pr{sub 0.8}Na{sub 0.2}MnO{sub 3}. {copyright} 2001 American Institute of Physics.

• Sponsoring Organization: (US)
• OSTI ID: 40204074
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 89; ISSN 0021-8979
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CURIE POINT
ELECTRIC CONDUCTIVITY
GROUND STATES
MAGNETIC FIELDS
MAGNETIC MOMENTS
NEUTRON DIFFRACTION
PHASE DIAGRAMS
SOLID SOLUTIONS
SPECIFIC HEAT