Abstract
It is known that Ho3+ ion in elpasolite compound Cs2NaHoCl6, in its electronic ground state, is a Γ3 nonmagnetic doublet in a cubic crystal structure at higher temperatures than 0.6 K. A crystal distortion was observed by nuclear magnetic resonance (NMR) and specific heat experiments at lower temperatures. Electronic and nuclear spin ground states in the distorted phase were deduced from our experimental results. Antiferromagnetic state of enhanced nuclear spins of165Ho in Cs2NaHoCl6 was observed following demagnetization cooling. It was studied by magnetic susceptibility, specific heat, and antiferromagnetic resonance measurements. Spin structure and internal field of its state are discussed.
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