We have studied the magnetization of CeOs2Al10 in high magnetic fields up to 55 T for H // a and constructed the magnetic phase diagram for H // a. The magnetization curve shows a concave H dependence below T_max \sim40 K which is higher than the transition temperature T_0 \sim29 K. The magnetic susceptibility along the a-axis shows a smooth and continuous decrease down to \sim20 K below T_max \sim40 K without showing an anomaly at T_0. From these two results, a Kondo singlet is formed below T_max and coexists with the antiferro magnetic order below T_0. We also propose that the larger suppression of the spin degrees of freedom along the a-axis than along the c-axis below T_max is associated with the origin of the antiferro magnetic component.
@article{arxiv.1105.2151,
title = {High-field magnetization and magnetic phase transition in CeOs2Al10},
author = {Akihiro Kondo and Junfeng Wang and Koichi Kindo and Yuta Ogane and Yukihiro Kawamura and Sakiyo Tanimoto and Takashi Nishioka and Daiki Tanaka and Hiroshi Tanida and Masafumi Sera},
journal= {arXiv preprint arXiv:1105.2151},
year = {2013}
}
Comments
4 pages, 4 figures, to appear in Phys. Rev. B, Rapid Commun