The elastic neutron scattering experiments were carried out on the solid solutions CeRh_{1-x}Co_xIn_5 to clarify the nature of the antiferromagnetic (AF) state in the vicinity of the quantum critical point (QCP): x_c ~0.8. The incommensurate AF order with the wave vector of q_h=(1/2,1/2,~0.3) observed in pure CeRhIn_5 is weakly suppressed upon doping with Co, and a commensurate q_c=(1/2,1/2,1/2) and an incommensurate q_1=(1/2,1/2,~0.42) AF structures evolve at intermediate Co concentrations. These AF orders are enhanced at x=0.7, and furthermore the q_h AF order vanishes. These results suggest that the AF correlations with the q_c and q_1 modulations are significantly enhanced in the intermediate x range, and may be connected with the evolution of the superconductivity observed above x~0.3.
@article{arxiv.0805.1957,
title = {Change of Antiferromagnetic Structure near a Quantum Critical Point in CeRh1-xCoxIn5},
author = {M. Yokoyama and N. Oyama and H. Amitsuka and S. Oinuma and I. Kawasaki and K. Tenya and M. Matsuura and K. Hirota and T. J. Sato},
journal= {arXiv preprint arXiv:0805.1957},
year = {2008}
}
Comments
5 pages, 5 figures, accepted for publication in Phys. Rev. B