Abstract
The orthorhombic intermetallic compound TmCu2 orders antiferromagnetically below TN=6.5 K. Bulk studies indicate a complex magnetic phase diagram (MPG) in fields along the b axis. Neutron diffraction on a single crystal of TmCu2 confirmed the complexity of the MPG. Four different antiferromagnetic (AF) phases were observed below TN in zero magnetic field; the ground state AF1 corresponds to the squared-up AF structure with propagation vector τ1=(5/8,0,0) and magnetic unit cell 8a×b×c. Four ferrimagnetic phases were found for B<0.5 T parallel to the b axis and a field-induced ferromagnetic phase exists for higher fields. The individual phases were identified and the MPG along the b axis is presented.
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