A quantum-mechanical 1/3 magnetization plateau and magnetic long-range order appear in the large-spin (5/2) substance SrMn3P4O14. Magnetization results of SrMn3P4O14 can be explained by the spin-5/2 isolated antiferromagnetic linear trimer with the intra-trimer interaction (J1) value of 4.0 K. In the present study, to confirm the spin system, we performed inelastic neutron scattering (INS) experiments of SrMn3P4O14 powders. We observed plural magnetic excitations. The peak positions are 0.46, 0.68, and 1.02 meV. Constant-Q-scan spectra at several Q values (magnitude of the scattering vector) indicate that the dispersion is weak. The weak dispersion indicates that the excitations are transitions between discrete energy levels. Our INS results are consistent with results expected in the trimer model. We evaluated the J1 value as 0.29 meV (3.4 K) without considering the other interactions.
@article{arxiv.1109.6720,
title = {Magnetic excitations in the spin-5/2 antiferromagnetic trimer substance SrMn3P4O14},
author = {Masashi Hase and Masaaki Matsuda and Koji Kaneko and Naoto Metoki and Kazuhisa Kakurai and Tao Yang and Rihong Cong and Jianhua Lin and Kiyoshi Ozawa and Hideaki Kitazawa},
journal= {arXiv preprint arXiv:1109.6720},
year = {2015}
}