Helton J S, Matan K, Shores M P, Nytko E A, Bartlett B M, Yoshida Y, Takano Y, Suslov A, Qiu Y, Chung J-H, Nocera D G, Lee Y S
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2007 Mar 9;98(10):107204. doi: 10.1103/PhysRevLett.98.107204.
We have performed thermodynamic and neutron scattering measurements on the S=1/2 kagomé lattice antiferromagnet ZnCu3(OH)6Cl2. The susceptibility indicates a Curie-Weiss temperature of theta CW approximately = -300 K; however, no magnetic order is observed down to 50 mK. Inelastic neutron scattering reveals a spectrum of low energy spin excitations with no observable gap down to 0.1 meV. The specific heat at low-T follows a power law temperature dependence. These results suggest that an unusual spin liquid state with essentially gapless excitations is realized in this kagomé lattice system.
我们对S = 1/2的 Kagomé晶格反铁磁体ZnCu3(OH)6Cl2进行了热力学和中子散射测量。磁化率表明居里 - 外斯温度θCW约为 -300 K；然而，在低至50 mK的温度下未观察到磁有序。非弹性中子散射揭示了一系列低能自旋激发，在低至0.1 meV时没有可观察到的能隙。低温下的比热遵循幂律温度依赖性。这些结果表明，在这个Kagomé晶格系统中实现了一种具有基本无隙激发的异常自旋液体状态。
