High-field NMRstudies on heavy fermion systems with non-Kramers crystal electric field ground state

磁场是控制重费米子化合物电子态的一个很好的调谐参数。在17特斯拉的磁场下，通过核磁共振测量获得了三种典型重费米子化合物CeCu6、UBe13和PrOs4Sb12的准粒子磁化率。cecu6的准粒子磁化率在高磁场下被显著抑制。这种行为可以用近藤共振能级模型来解释。另一方面，ube13的准粒子磁化率的抑制约为17特斯拉以上总磁化率的13%。其余约87%是由于Van Vleck敏感性。目前的研究强烈表明，f2体系中的准粒子磁化率与f1体系不同。

A magnetic field is a good tuning parameter to control the electronic state of heavy fermion compounds. The quasiparticle susceptibility of three typical heavy fermion compounds, CeCu6 and UBe13, and PrOs4Sb12 was obtained by NMR measurements under the magnetic fields up to 17 tesla. The quasiparticle susceptibility for CeCu6is suppressed drastically at high magnetic fields. This behavior was explained by the Kondo resonance level model. On the other hand, the suppression of the quasiparticle susceptibility for UBe13is about 13 % of the total susceptibility above applied field of 17 tesla. The remaining ~87 % is due to the Van Vleck susceptibility. The present studies strongly suggested that the quasiparticle susceptibility in the f2system is different from that of f1system.