Magnetic phase diagram of magnetoelectric LiMnPO4
Publication: Research - peer-review › Journal article – Annual report year: 2012
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Magnetic phase diagram of magnetoelectric LiMnPO4. / Toft-Petersen, Rasmus; Andersen, Niels Hessel; Li, Haifeng; Li, Jiying; Tian, Wei; Bud'ko, Sergey L.; Jensen, Thomas Bagger Stibius; Niedermayer, Christof; Laver, Mark; Zaharko, Oksana; Lynn, Jeffrey W.; Vaknin, David.
In: Physical Review B (Condensed Matter and Materials Physics), Vol. 85, No. 22, 2012, p. 224415.Publication: Research - peer-review › Journal article – Annual report year: 2012
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TY - JOUR
T1 - Magnetic phase diagram of magnetoelectric LiMnPO<sub>4</sub>
A1 - Toft-Petersen,Rasmus
A1 - Andersen,Niels Hessel
A1 - Li,Haifeng
A1 - Li,Jiying
A1 - Tian,Wei
A1 - Bud'ko,Sergey L.
A1 - Jensen,Thomas Bagger Stibius
A1 - Niedermayer,Christof
A1 - Laver,Mark
A1 - Zaharko,Oksana
A1 - Lynn,Jeffrey W.
A1 - Vaknin,David
AU - Toft-Petersen,Rasmus
AU - Andersen,Niels Hessel
AU - Li,Haifeng
AU - Li,Jiying
AU - Tian,Wei
AU - Bud'ko,Sergey L.
AU - Jensen,Thomas Bagger Stibius
AU - Niedermayer,Christof
AU - Laver,Mark
AU - Zaharko,Oksana
AU - Lynn,Jeffrey W.
AU - Vaknin,David
PB - American Physical Society
PY - 2012
Y1 - 2012
N2 - <p>The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO<sub>4</sub> 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 T<sub><em>N</em></sub> as compared to zero field and 10 T, without an increase in peak width. This suggests an increased <em>density</em> of fluctuations at the bicritical field as compared to zero field.</p>
AB - <p>The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO<sub>4</sub> 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 T<sub><em>N</em></sub> as compared to zero field and 10 T, without an increase in peak width. This suggests an increased <em>density</em> of fluctuations at the bicritical field as compared to zero field.</p>
KW - PHYSICS,
KW - SPIN-FLOP
KW - TETRACRITICAL POINTS
KW - WEAK FERROMAGNETISM
KW - SINGLE-CRYSTAL
KW - FERROELECTRICITY
KW - ANTIFERROMAGNET
KW - SCATTERING
U2 - 10.1103/PhysRevB.85.224415
DO - 10.1103/PhysRevB.85.224415
JO - Physical Review B (Condensed Matter and Materials Physics)
JF - Physical Review B (Condensed Matter and Materials Physics)
SN - 1098-0121
IS - 22
VL - 85
SP - 224415
ER -