Magnetic phase diagram of magnetoelectric LiMnPO4
| Title | Magnetic phase diagram of magnetoelectric LiMnPO4 |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Toft-Petersen R, Andersen NH, Li HF, Li JY, Tian W, Bud'ko SL, Jensen TBS, Niedermayer C, Laver M, Zaharko O, Lynn JW, Vaknin D |
| Journal Title | Physical Review B |
| Volume | 85 |
| Pages | 224415 |
| Date Published | 06 |
| Type of Article | Article |
| ISBN Number | 1098-0121 |
| Accession Number | WOS:000305251300004 |
| Keywords | ANTIFERROMAGNET, ferroelectricity, scattering, SINGLE-CRYSTAL, spin-flop, tetracritical points, weak ferromagnetism |
| Abstract | 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 T-N 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. |
| URL | <Go to ISI>://WOS:000305251300004 |
| DOI | 10.1103/PhysRevB.85.224415 |
| Alternate Journal | Phys. Rev. B |
