Abstract
Magnetic properties of two-dimensional spin-frustrated ${\mathrm{CuFeO}}_{2}$ have been studied up to 19 GPa by means of ${}^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy. The partially disordered spin arrangement at ambient pressure in the 11--16 K range, transforms with pressure to a long-range ordered ``5-sublattice'' phase with a distinct ${T}_{N},$ a similar role played by external magnetic field in neutron studies. This phase gradually substitutes for the ``4-sublattice'' magnetic ground state present at ambient pressure, reaching 100% at 19 GPa. Despite the presence of long-range order, this high pressure phase exhibits magnetic relaxation above 20 K attributed to the notwithstanding weak interplanar superexchange interaction. The dramatic twofold increase of ${T}_{N}$ at 19 GPa is explained in terms of the unusual increase of the intraplanar direct exchange ${J}_{\ensuremath{\parallel}}$ caused by the anomalous anisotropic compression of ${\mathrm{CuFeO}}_{2}$ in which $c/a$ increases with pressure.
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