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We report the physical properties of Eu-doped bulk TmFeO3 through X-ray diffraction, magnetic susceptibility (χ), Raman scattering and X-ray absorption spectroscopy (XAS) study, which shows a similar orthorhombic structure with the Pbnm space group as TmFeO3. Magnetic measurement on Eu-doped TmFeO3 provides evidence for spin reorientations of Fe3+. Further, the Raman spectra of Eu3+ doped TmFeO3 show significant changes in Raman modes as a function of temperature, which are evidence for strong spin–lattice interaction. From the XAS spectra, the L-edge of Fe provides information on the valence state of Fe, whereas the K-edge of oxygen shows that the compound has a strong influence on the hybridization of the O(2p) state with the 3d states of Fe. [ABSTRACT FROM AUTHOR]

SmxPr1-xFeO3 (x = 0, 0.4, 0.7, 0.9, 1.0) all-in-one single crystal rod with quasi-continuous composition distribution was successfully grown by a hetero-seed and hetero-feed optical floating zone technique in flowing air. The lattice mismatch between each adjacent composition is very small, leading to the high-quality continuous growth of SmxPr1-xFeO3 single crystal rod. X-ray back-reflection Laue photographs indicate that all single crystals at different positions along the growth direction have good crystallization quality and the same crystallographic axis. The composition change of the quasi-continuous single crystals along growth direction was analyzed by energy-dispersive X-ray spectroscopy (EDS), which shows that the composition varies continuously and smoothly near the different composition boundaries. At a distance relatively far away from the boundary, the composition remains constant. Finally, we measured the anisotropic magnetic properties of these single crystals when x = 0.7. Our study shows that the hetero-seed and hetero-feed optical floating zone technique has a great potential for high-throughput growth of crystalline materials, and could serve as an effective method to collect single crystal material properties in materials database research. [ABSTRACT FROM AUTHOR]

Strongly correlated electron systems are an excellent platform for functional materials. Here, we present a strong magnetic effect in the Eu3+-doped TmFeO 3 single crystal, where half of the Tm3+ sites are replaced by Eu3+ dopants in the orthorhombic lattice of TmFeO 3 (Tm 0.5 Eu 0.5 FeO 3). We demonstrated by combining the dc -magnetic susceptibility χ(T) as well as magnetization isotherm M (H), that the temperature dependent magnetization results under tiny change in magnetic field (H) shows the evidence for the formation of such remarkable effects due to Tm3+ substituted with Eu3+ ion in TmFeO 3. Interestingly, Eu3+ doping protects the antiferromagnetic (AFM) spin-reorientation transition along crystallographic c -axis as observed by a sharp transition at T SR = 90 K, similar as parent TmFeO 3. Further, an external applied field (H) of 500 Oe is enough to fully suppress the spin-reorientation transition in Eu3+ doped TmFeO 3. We emphasize that the transition from almost free-state of Tm3+ spin to AFM state changes by 90 K at such low magnetic field. Experimentally observe significant changes in terms of shift in the magnetic transition (SRT) under an applied very low magnetic field due to Eu3+ doping in TmFeO 3 lattice is truly robust effect. [Display omitted] • Interesting magnetic effect in the Eu3+-doped TmFeO3 single crystal. • Single crystals were grown using a four-mirror optical-floating zone furnace. • Spin-reorientation transition in TmFeO3 is found to be at TSR = 93 K at an applied field H = 100 Oe. • External applied field of 500 Oe is enough to fully suppress the spin-reorientation transition in Eu3+ doped TmFeO 3. • Eu3+ ions in TmFeO 3 are playing important role which significantly enhances the spin-lattice correlations. [ABSTRACT FROM AUTHOR]