Thermal conductivity of geometrically frustrated, ferroelectric YMnO3: extraordinary spin-phonon interactions.
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.
Sharma
P A
PA
Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
Ahn
J S
JS
Hur
N
N
Park
S
S
Kim
Sung Baek
SB
Lee
Seongsu
S
Park
J-G
JG
Guha
S
S
Cheong
S-W
SW