We have measured the nuclear susceptibility of polycrystalline rhodium foils down to 2809 pK and up to -750 pK. In spite of these record-low and -high spin temperatures, the ordered states were not reached. At T>0, the measured susceptibility follows the antiferromagnetic Curie-Weiss law with θ=-(1.8±0.3)nK. At Tnn/h = -17±3 Hz and Jnnn/h = 10±3 Hz if only nearest and next nearest neighbor interactions are assumed.
- negative temperatures
- nuclear magnetism