Thermal conductivity of geometrically frustrated, ferroelectric YMnO3: extraordinary spin-phonon interactions |
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| Authors: | Sharma P A Ahn J S Hur N Park S Kim Sung Baek Lee Seongsu Park J-G Guha S Cheong S-W |
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| Institution: | Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA. |
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| Abstract: | The thermal conductivity of the magnetically frustrated, ferroelectric YMnO3 exhibits an isotropic suppression in the cooperative paramagnetic state, followed by a sudden increase upon magnetic ordering. This unprecedented behavior without an associated static structural distortion probably originates from the strong dynamic coupling between acoustic phonons and low-energy spin fluctuations in geometrically frustrated magnets. The replacement of magnetic Ho for Y at the ferroelectrically active site results in an even larger effect, suggestive of the strong influence of multiferroicity. |
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