Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653284 | Solid State Communications | 2005 | 4 Pages |
Abstract
The specific heat of single-crystal NdMnO3 was investigated from 2 to 20Â K under different magnetic fields up to 8Â T. All the specific heat data show a Schottky-like anomaly, which becomes more indistinctive as increasing magnetic field. The experiment data were successfully fitted by taking into account factors such as crystal-field splitting, the two-level Schottky anomaly, the lattice vibration, and type-A antiferromagnetic (A-AF) spin waves. It was found that the splitting of the ground state doublet of Nd3+ ion increases linearly with magnetic field. The above phenomena can be interpreted in terms of the model of unchanged effective molecular field at Nd3+ site caused by the ferromagnetic component of A-AF structure of Mn spins. This ferromagnetic component is likely caused by the GdFeO3-type octahedron rotation. In addition, it was also found that the magnetic field increases the spin-wave stiffness coefficient, but reduces the Debye temperature.
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Materials Science
Materials Science (General)
Authors
J.G. Cheng, Y. Sui, Z.N. Qian, Z.G. Liu, J.P. Miao, X.Q. Huang, Z. Lu, Y. Li, X.J. Wang, W.H. Su,