Abstract
We consider an effect of a strong magnetic field on the ground state and\nmacroscopic coherent tunneling in small antiferromagnetic particles with\nuniaxial and biaxial single-ion anisotropy. We find several tunneling regimes\nthat depend on the direction of the magnetic field with respect to the\nanisotropy axes. For the case of a purely uniaxial symmetry and the field\ndirected along the easy axis, an exact instanton solution with two different\nscales in imaginary time is constructed. For a rhombic anisotropy the effect of\nthe field strongly depends on its orientation: with the field increasing, the\ntunneling rate increases or decreases for the field parallel to the easy or\nmedium axis, respectively. The analytical results are complemented by numerical\nsimulations.\n
Keywords
Condensed matter physicsQuantum tunnellingAnisotropyInstantonPhysicsMagnetic fieldAntiferromagnetismField (mathematics)Magnetic anisotropySymmetry (geometry)MagnetizationQuantum mechanicsGeometryMathematics
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Publication Info
- Year
- 2004
- Type
- article
- Volume
- 70
- Issue
- 21
- Citations
- 5
- Access
- Closed
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Cite This
B. A. Ivanov,
V. E. Kireev
(2004).
Macroscopic quantum tunneling in small antiferromagnetic particles: Effects of a strong magnetic field.
Physical Review B
, 70
(21)
.
https://doi.org/10.1103/physrevb.70.214430
Identifiers
- DOI
- 10.1103/physrevb.70.214430