Schottky-like anomaly in the low-temperature specific heat of single-crystal NdMnO3 |
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Authors: | J.G. Cheng |
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Affiliation: | Department of Applied Physics, Center for Condensed Matter Science and Technology (CCMST), Harbin Institute of Technology, P.O. Box 406, Harbin 150001, Pepole's Republic of China |
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Abstract: | The specific heat of single-crystal NdMnO3 was investigated from 2 to 20 K under different magnetic fields up to 8 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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Keywords: | 75.30.&minus m 65.40.&minus b 75.40.&minus s |
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