IPA-CuCl_3的热导率：弹道磁振子输运和玻色-爱因斯坦凝聚模型有限适用性的证据
Thermal conductivity of IPA-CuCl_3: Evidences of ballistic magnon transport and limited applicability of the Bose-Einstein condensation model
摘要：
研究了具有玻色-爱因斯坦凝聚（BEC）的量子磁体候选材料（CH_3）_2CHNH_3CuCl_3（IPA-CuCl_3）在超低温和高磁场中的热输运.由于自旋能隙的存在，零场热导率（κ）是纯声子的，在T <1 K时表现出弹道行为。当带隙在H = H_{c1}处被磁场封闭时，Cu ^{2 +}磁矩的长程反铁磁（AF）序被发展出来，磁振子对热输运有显著贡献，并在T <600 mK时表现出弹道T^3行为。此外，低T κ（H）等温线在H_{c1}处显示出尖锐的峰，这表明在AF状态下（H> H_{c1}）间隙重新打开，并证明BEC模型对IPA-CuCl_3的适用性有限。
英文摘要：
The heat transport of the spin-gapped material (CH_3)_2CHNH_3CuCl_3 (IPA-CuCl_3), a candidate quantum magnet with Bose-Einstein condensation (BEC), is studied at ultra-low temperatures and in high magnetic fields. Due to the presence of the spin gap, the zero-field thermal conductivity (κ) is purely phononic and shows a ballistic behavior at T < 1 K. When the gap is closed by magnetic field at H = H_{c1}, where a long-range antiferromanetic (AF) order of Cu^{2+} moments is developed, the magnons contribute significantly to heat transport and exhibit a ballistic T^3 behavior at T < 600 mK. In addition, the low-T κ(H) isotherms show sharp peaks at H_{c1}, which indicates a gap re-opening in the AF state (H > H_{c1}) and demonstrates limited applicability of the BEC model to IPA-CuCl_3.
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