Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Half Metals and Oxides
MA 3.6: Vortrag
Montag, 23. März 2009, 12:15–12:30, HSZ 401
Phase transition and anomalous low temperature ferromagnetic phase in a Pr0.6Sr0.4MnO3 single crystal — •Sahana Roessler1, Steffen Wirth1, Frank Steglich1, S Harikrishnan2, C. M. Naveen Kumar2, Suja Elizabeth2, H. L. Bhat2, and Ulrich Karl Roessler3 — 1Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187, Dresden, Germany — 2Department of Physics, Indian Institute of Science, Bangalore 560012, India — 3IFW Dresden, Postfach 270016, D-01171 Dresden, Germany
We report on the specific heat, electrical and magnetic properties of a Pr0.6Sr0.4MnO3 single crystal. This compound is ferromagnetic and metallic below 300 K. The critical properties of the ferromagnetic transition investigated by static magnetic measurements, resistivity and specific heat display a continuous phase transition with the critical exponents belonging to those of the Heisenberg universality class. However, below a structural transition at TS ∼ 60 K, the field dependence of magnetization (M-H) loops display anomalous behavior, with the virgin curve lying outside the subsequent M-H cycles. The coercivity of these M-H loops is found to be close to zero. The hysteretic transformation and irreversible magnetization processes below TS is explained by phase separation between the orthorhombic and monoclinic ferromagnetic phases. Magnetic fields apparently drive modifications in these phase-separated microstructures which suggests a high magnetic anisotropy of the monoclinic phase.