The thermal evolution of the a lattice constant is found to drive the change from FM to AFM magnetic order. The unit cell shrinks abruptly in the basal plane only, while it's dimension along the six-fold symmetry axis c changes continuously. ![]() ![]() The FM-AFM transformation proceeds in a stepwise fashion, as a first-order phase transition, and is accompanied by an isomorphic (without change of symmetry) lattice collapse. It is revealed that the intermetallic compound Hf0.86Ta0.14Fe2 exhibits temperature-induced magnetic phase transitions from ferromagnetic (FM) to antiferromagnetic (AFM) order and then to the paramagnetic (PM) state upon heating. ![]() With the use of neutron powder diffraction, we have discovered and characterized an extremely anisotropic thermal expansion, including negative thermal expansion (NTE), in an itinerant-electron system Hf0.86Ta0.14Fe2.
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