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The spin glass delafossite CuFe 0.5 V 0.5 O 2 : a dipolar glass?

Abstract : The ferroelectric and spin glass properties of CuFe0.5V0.5O2 have been studied. Magnetization, ac magnetic susceptibility and specific heat measurements reveal a spin glass behavior (Tf = 20.5 K) for this delafossite. In CuFeO2, substitution of trivalent diamagnetic cations for Fe3 + is known to change the antiferromagnetic state and induce ferroelectricity. But partial occupation of the Fe3 + site by V3 + is responsible for disordered magnetism in CuFe0.5V0.5O2. The dielectric permittivity shows a frequency dependence reminiscent of relaxor ferroelectrics in which different cations occupy the same crystallographic site. Polarization measurements show the existence of a ferroelectric state below Tf with P5 K≈1.3 µC m − 2. These results point towards a relaxor-type ferroelectricity originating from a disordered array of magnetic cations. A clear coupling between electronic charges and spins is evidenced by the magnetodielectric effect.
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Submitted on : Tuesday, August 6, 2019 - 11:14:58 AM
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Kiran Singh, Antoine Maignan, Charles Simon, Vincent Hardy, Elise Pachoud, et al.. The spin glass delafossite CuFe 0.5 V 0.5 O 2 : a dipolar glass?. Journal of Physics: Condensed Matter, IOP Publishing, 2011, 23 (12), pp.126005. ⟨10.1088/0953-8984/23/12/126005⟩. ⟨hal-02264063⟩



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