Magnetic field tunable dielectric dispersion in successive field-induced magnetic phases of the geometrically frustrated magnet CuFeO2 up to 28 T

Dielectric phenomena of multiferroic oxides at acoustic- and radio-frequency

“…It may also bring about a strong carrier-lattice interaction. Therefore, the charged carrier become localized as a polaronic form, namely, a charged carrier self-localization/trapping in an energetically favorable local lattice distortion (a polarization cloud) [144,169,174,178,232,262]. In another hand, strong-correlated electron interactions also make the charged carrier localized.…”

“…The systematic analyses of the dielectric anomalies in broadband frequency range (from acoustic-to optical-frequency) are extremely significant and are able to provide one detailed and unique insight into abundant underlying fundamental physics. It involves phase transition , quantum paraelectric and quantum electric-dipole liquids [57][58][59][60][61][62][63][64][65][66], ferroic domain wall (DW) motion [67][68][69][70][71][72][73][74], short-range polar region, nano-microdomain and multiglass behaviors [29,, heterogeneous interface effects [51,, the origin of magnetoelectric and magnetodielectric (MD) phenomena [39-41, 48, 139, 140, 145-148], the motion of charged point defects and related defect complexes [115,143,, the transport mechanisms of localized charged carriers and polarons [24,138,144,147,164,169,, electronic phase separation [139,140], charge order-disorder [24,51,131,185], spin-lattice interaction [39,40,48], electron-phonon interaction [215], optical phonon soft modes [216], electronic critical points transitions [215,…”

Crystal structure and hyperfine interactions of delafossite (CuFeO2) synthesized hydrothermally

“…Until now, the magnetic properties of CuFeO 2 have been well studied only for the 3R phase. Using neutron diffraction, two magnetic transitions have been observed at the temperatures T N1 $ 14 K and T N2 $ 11 K (Mitsuda et al, 1991;Mekata et al, 1992;Tamatsukuri et al, 2018). When lowering the temperature, the 3R-CuFeO 2 delafossite goes from the paramagnetic state at T N1 = 14 K to the collinear magnetic ordering of the spin-density-wave type and next, below T N2 = 11 K, to the antiferromagnetic collinear magnetic structure of the 4SL type (4-sublattice), with the sequence of spin arrangement ""## along the crystallographic c axis (Nakamura et al, 2015).…”