Monte Carlo Study of Antiferromagnetic Nuclear Ordering in Cu

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Abstract
Four different antiferromagnetic arrangements of nuclear spins have been identified in Cu from a Monte Carlo study for different magnetic fields and temperatures. The long-range-dipolar and indirect-exchange interactions were included up to eighth nearest neighbors (140 nuclear spins) and the indirect interaction was calculated from a realistic energy band structure. The phases appear to be compatible with the three phases found in Cu experimentally, and the transition temperature in zero field of about 50 nK is in approximate agreement with the experimental value of 60 nK.

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