Quasi-one-dimensional S = 1/2 Heisenberg system Rb2Cu2Mo3O12 described by the J1 - J2 model with the nearest-neighbor ferromagnetic and next-nearest-neighbor antiferromagnetic exchange interactions have been investigated by 87/85Rb-NMR under extended field range up to 18 T. From the thermal-activation-type temperature dependence of l/T1, opening of the spin excitation gap was confirmed under the low field below 2 T. With increasing the field, the system becomes gapless, and the gap opens again in the high field saturation region, where the field dependence of the gap size showed the coherent excitation of the neighbouring two spins.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2017 Apr 20|
|Event||8th International Conference on Highly Frustrated Magnetism 2016, HFM 2016 - Taipei, Taiwan, Province of China|
Duration: 2016 Sep 7 → 2016 Sep 11
ASJC Scopus subject areas
- Physics and Astronomy(all)