Observation of Nuclear Antiferromagnetic Order in Copper by Neutron Diffraction at Nanokelvin Temperatures

Abstract
Long-range nuclear antiferromagnetic order in the nuclear-spin system of a Cu65 single crystal has been observed by neutron diffraction. By use of a linear position-sensitive detector, the time evolution of the antiferromagnetic (100) Bragg peak was followed during the warmup of the nuclear-spin system. The peak intensity was found to depend strongly on the external magnetic field between B=0 and the critical field Bc=0.25 mT.

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