High magnetic field phase diagram and failure of the magnetic Grüneisen scaling in LiFePO4$
We report the magnetic phase diagram of single-crystalline LiFePO4 in magnetic fields up to 58 T and present a detailed study of magnetoelastic coupling by means of high-resolution capacitance dilatometry. Large anomalies at TN in the thermal-expansion coefficient α imply pronounced magnetoelastic c...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
24 June 2019
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| In: |
Physical review
Year: 2019, Volume: 99, Issue: 21 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.99.214432 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevB.99.214432 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.99.214432 
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| Author Notes: | J. Werner, S. Sauerland, C. Koo, C. Neef, A. Pollithy, Y. Skourski, and R. Klingeler |
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| 245 | 1 | 0 | |a High magnetic field phase diagram and failure of the magnetic Grüneisen scaling in LiFePO4$ |c J. Werner, S. Sauerland, C. Koo, C. Neef, A. Pollithy, Y. Skourski, and R. Klingeler |
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| 520 | |a We report the magnetic phase diagram of single-crystalline LiFePO4 in magnetic fields up to 58 T and present a detailed study of magnetoelastic coupling by means of high-resolution capacitance dilatometry. Large anomalies at TN in the thermal-expansion coefficient α imply pronounced magnetoelastic coupling. Quantitative analysis yields the magnetic Grüneisen parameter γmag=6.7(5)×10−7 mol/J. The positive hydrostatic pressure dependence dTN/dp=1.46(11) K/GPa is dominated by uniaxial effects along the a axis. Failure of Grüneisen scaling below ≈40K, i.e., below the peak temperature in the magnetoelectric coupling coefficient [7], implies several competing degrees of freedom. A broad and strongly magnetic field dependent anomaly in α in this temperature regime highlights the relevance of structure changes. Upon application of the magnetic field B||b axis, a pronounced jump in the magnetization implies spin reorientation at BSF=32T as well as a precursing phase at 29 T and T=1.5K. In a two-sublattice mean-field model, the saturation field Bsat,b=64(2)T enables assessing the effective antiferromagnetic exchange interaction Jaf=2.68(5)meV as well as anisotropies Db=−0.53(4)meV and Dc=0.44(8)meV. | ||
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