Kim M G, Winn B, Chi S, Savici A T, Rodriguez-Rivera J A, Chen W C, Xu X, Li Y, Kim J W, Cheong S-W, Kiryukhin V
Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev B. 2019 Jul;100(1). doi: 10.1103/PhysRevB.100.024405.
Inelastic neutron scattering studies in single crystals of TbInO and TbInMnO with nearly triangular antiferromagnetic lattice are reported. At low energies, a broad and apparently gapless continuum of magnetic excitations, located at the triangular lattice (TL) Brillouin zone boundary, is observed. The data are well described by the uncorrelated nearest-neighbor valence bonds model. At higher energies, a broad excitation branch dispersing from the TL zone boundary is observed. No signs of static magnetic order are found down to the temperatures two orders of magnitude smaller than the effective interaction energy. The fluctuating magnetic moment exceeds two-thirds of the Tb free-ion value and is confined to the TL plane. These observations are consistent with a TL-based spin liquid state in TbInO.
报道了在具有近三角形反铁磁晶格的TbInO和TbInMnO单晶中的非弹性中子散射研究。在低能量下，观察到位于三角形晶格（TL）布里渊区边界的一个宽泛且明显无间隙的磁激发连续体。这些数据可以用不相关的最近邻价键模型很好地描述。在较高能量下，观察到一个从TL区边界色散的宽泛激发分支。在比有效相互作用能量小两个数量级的温度下，未发现静态磁有序的迹象。波动磁矩超过Tb自由离子值的三分之二，并局限于TL平面。这些观察结果与TbInO中基于TL的自旋液体状态一致。
