Nuclear magnetic ordering in solid helium‐3 provides the ultralow‐temperature physicist with a unique opportunity to study cooperative magnetic phenomena in a quantum spin system. There are two known—and very different— magnetic phases of low‐density solid and at higher densities ferromagnetism may exist. with ordering temperatures at low densities near 1 mK, these systems are easily accessible with modern demagnetization cryostats. Over the next few years experimental and theoretical studies of these systems will advance considerably our understanding of nuclear magnetism.
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1987
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