Magnetic susceptibility and specific heat measurements in magnetic fields were performed on an S=1/2 one-dimensional antiferromagnet KCuGaF6. Exchange interaction was evaluated as J/kB≃100 K. However, no magnetic ordering was observed down to 0.46 K. It was found that an applied magnetic field induces a staggered magnetic susceptibility obeying the Curie law and an excitation gap, both of which should be attributed to the antisymmetric interaction of the Dzyaloshinsky-Moriya type and/or the staggered g-tensor. With increasing magnetic field H, the gap increases almost in proportion to H2/3.
@article{arxiv.cond-mat/0607469,
title = {Magnetic-Field Induced Gap in One-Dimensional Antiferromagnet KCuGaF$_6$},
author = {R. Morisaki and T. Ono and H. Tanaka and H. Uekusa},
journal= {arXiv preprint arXiv:cond-mat/0607469},
year = {2009}
}
Comments
Submitted to Proceedings of Research in High Magnetic Field