We have systematically measured the thermal conductivity along the , [101̄] and b* directions, κ[101̄], κ[101̄] and κb*, respectively, of the S = 1/2 bond-alternating spin-chain system Pb2V3O9 in magnetic fields parallel and perpendicular to the heat current. It has been found that κ along the spin chains is markedly enhanced in the BEC state, which has been concluded to be due to the enhancement of the thermal conductivity due to triplons. Furthermore, it has been found that the enhancement of κ[101̄] in the BEC state is more marked in magnetic fields parallel to the  direction than perpendicular to the  direction. The BEC state may be weakened or broken in magnetic fields perpendicular to the  direction on account of the breaking of the rotational symmetry.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2012 1 1|
|イベント||26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China|
継続期間: 2011 8 10 → 2011 8 17
ASJC Scopus subject areas
- Physics and Astronomy(all)