Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-03-08
Physical Review B 76, 094418 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages including 6 figures
Scientific paper
10.1103/PhysRevB.76.094418
We present measurements of the thermal conductivity $\kappa $ and the thermal expansion $\alpha$ of NdMnO$_3$ and TbMnO$_3$. In both compounds a splitting of the $4f$ multiplet of the $R^{3+}$ ion causes Schottky contributions to $\alpha$. In TbMnO$_3$ this contribution arises from a crystal-field splitting, while in NdMnO$_3$ it is due to the Nd-Mn exchange coupling. Another consequence of this coupling is a strongly enhanced canting of the Mn moments. The thermal conductivity is greatly suppressed in both compounds. The main scattering process at low temperatures is resonant scattering of phonons between different energy levels of the $4f$ multiplets, whereas the complex 3d magnetism of the Mn ions is of minor importance.
Aliouane Nadir
Argyriou Dimitri N.
Baier Johannes
Balbashov A.
Berggold K.
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