Magnetic phase diagram of magnetoelectric LiMnPO4

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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DOI

  • Author: Toft-Petersen, Rasmus

  • Author: Andersen, Niels Hessel

    Neutrons and x-rays for materials physics, Department of Physics, Technical University of Denmark, Denmark

  • Author: Li, Haifeng, United States

    Dept Phys & Astron, Iowa State University, United States

  • Author: Li, Jiying, United States

    Dept Phys & Astron, Iowa State University, United States

  • Author: Tian, Wei, United States

    Dept Phys & Astron, Iowa State University, United States

  • Author: Bud'ko, Sergey L., United States

    Dept Phys & Astron, Iowa State University, United States

  • Author: Jensen, Thomas Bagger Stibius

  • Author: Niedermayer, Christof, Switzerland

    Paul Scherrer Inst, Neutron Scattering Lab, Switzerland

  • Author: Laver, Mark

  • Author: Zaharko, Oksana, Switzerland

    Paul Scherrer Inst, Neutron Scattering Lab, Switzerland

  • Author: Lynn, Jeffrey W., United States

    NIST, NIST Ctr Neutron Res, United States

  • Author: Vaknin, David, United States

    Dept Phys & Astron, Iowa State University, United States

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The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO4 is studied in fields applied along the a axis. A refinement of the magnetic structure using neutron diffraction data in the SF phase reveals that the spins reorient from being parallel to the a axis to be nearly along the c axis at magnetic fields between 4 and 4.7 T, depending on temperature. The low-field antiferromagnetic phase boundary is shown to join the spin-flop line tangentially at the so-called bicritical point, where there is a suppression of the ordering temperature. At the bicritical field, we observe an increased intensity of the Lorentz broadened elastic scattering at magnetic Bragg peaks above TN as compared to zero field and 10 T, without an increase in peak width. This suggests an increased density of fluctuations at the bicritical field as compared to zero field.

Original languageEnglish
JournalPhysical Review B (Condensed Matter and Materials Physics)
Publication date2012
Volume85
Journal number22
Pages224415
Number of pages7
ISSN1098-0121
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 6

Keywords

  • PHYSICS, SPIN-FLOP, TETRACRITICAL POINTS, WEAK FERROMAGNETISM, SINGLE-CRYSTAL, FERROELECTRICITY, ANTIFERROMAGNET, SCATTERING
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