2015/04/07 by Z. Y. Zhao, Bin Tong, B. Tong +14
Materials Science · Physics and Astronomy · #Condensed matter physics #Electrical resistivity and conductivity #Magnetic field #Materials science #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Spin (aerodynamics) #Thermal conductivity #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.91.134420
published as Phys. Rev. B 91, 134420 (2015) · 9 pages, 5 figures, accepted for publication in Phys. Rev. B
arxiv created 2015/04/07 · openalex publication_date 2015/04/17 · arxiv updated 2015/04/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The heat transport of the spin-gapped material (CH3)2CHNH3CuCl3 (IPA-CuCl3), a candidate quantum magnet with Bose-Einstein condensation (BEC), is studied at ultralow temperatures and in high magnetic fields. Due to the presence of the spin gap, the zero-field thermal conductivity (\ensuremathκ) is purely phononic and shows a ballistic behavior at T<1 K. When the gap is closed by magnetic field at H=Hc1, where a long-range antiferromanetic (AF) order of Cu2+ moments is developed, the magnons contribute significantly to heat transport and exhibit a ballistic T3 behavior at T<600 mK. In addition, the low-T\phantom\rule4pt0ex\ensuremathκ(H) isotherms show sharp peaks at Hc1, which indicates a gap reopening in the AF state (H>Hc1) and demonstrates limited applicability of the BEC model to IPA-CuCl3.