Abstract
LuFeO3 (LFO) a member of the orthoferrite (RFeO3) family, holds the promise of replacing the well-known room temperature multiferroic, BiFeO3 [1]. LFO nanoparticles with and without Ho doping (i.e., Lu1-xHoxFeO3 with 0 ≤ x ≤ 1) were synthesized using the hydrothermal method [2]. Rietveld refinement of the XRD data (Fig.1) for x = 0 (0.05) reveal the presence of both the hexagonal (h) P63cm and orthorhombic (o) Pnma phase fractions as 96% (6%) and 4% (94%), respectively. Further Ho doping resulted in pure o- structure. The lattice parameters (a, b, c) follow Vegard’s law ensuring the replacement of Lu atoms by Ho atoms. The common characteristics of o- RFeO3 are i) negligible ferroelectric polarization, ii) ordering of Fe3+ moments antiferromagnetically via Fe3+-O2--Fe3+ super-exchange interaction in ac plane and net magnetic moment along b direction for T 0.05 and increases the TSR from 0 in o-LFO to 57.8 ± 0.2 K in o-HFO.
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