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High pressure neutron diffraction experiments on triangular lattice Antiferromagnet CuFeO$$_{2}$$ using hybrid anvil cell

Terada, Noriki*; Osakabe, Toyotaka ; Khalyavin, D. D.*; Manuel, P.*; Radaelli, P. G.*; Kitazawa, Hideaki*

We have investigated the pressure effect on magnetic orderings in triangular lattice antiferromagnet CuFeO$$_{2}$$ up to 3.2 GPa, by means of neutron diffraction experiments with the hybrid-anvil-cell. The magnetic ground state of CuFeO$$_{2}$$ with ${it k}$ = (1/4, 1/4, 3/2) in ambient pressure is changed in to the other magnetic state under pressure. In the pressure induced phase, we observed the magnetic reflections at (${it q}$, ${it q}$, 3/2) and (1-${it q}$, 1-${it q}$, 3/2), ${it q}$ $$sim$$ 0.2 at 3.2 GPa and 1.5 K, which are the identical positions to those in field-induced or nonmagnetic impurity-induced noncollinear magnetic phase with ferroelectric polarization. This might suggest that pressure induces the ferro- electric phase in CuFeO$$_{2}$$.

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