Cluster Glass Behavior in Orthorhombic SmFeO₃ Perovskite: Interplay between Spin Ordering and Lattice Dynamics

Abstract

In this report, the isothermal time-dependent Raman scattering study has been used to investigate the origin of the cluster glass state in samarium orthoferrites (SmFeO3) via probing selective dynamics of different magnetic sublattices in the time domain. The existence of a cluster glass state in multiferroic SmFeO3 was demonstrated using direct current, alternating current, and field-dependent magnetic measurements. The temperature-dependent X-ray diffraction measurement confirms an anomaly in various structural parameters such as in the lattice constants, full width at half-maximum of X-ray diffraction peak, Fe/Sm–O bond lengths, and Fe/Sm–O–Fe bond angles across the cluster glass temperature regions; which suggest spin–lattice coupling in the SmFeO3 system. Further, the existence of a strong spin–lattice and magnetoelastic coupling has been confirmed using temperature-dependent Raman scattering investigation of the SmFeO3 sample. Moreover, the relaxation dynamics of sublattices of magnetic ions (Sm, Fe) in SmFeO3 across the cluster glass region were investigated using the isothermal time-dependent Raman scattering study, which evidently indicates the metastable state in the glassy region, whereas the said metastability is found to be completely absent beyond the glassy region.

Orbital facilitated charge transfer originated phonon mode in Cr‐substituted PrFeO3: A brief Raman study

“…[ 14–16 ] It is now well established that RS is one of the versatile technique not only to investigate the crystal structure but also to study the orbital mediated CT mechanism in doped rare earth ortho‐ferrites. [ 3,17,18 ]…”

“…During the past few decades, rare earth ortho-ferrites (RFeO 3 ) have gained enormous interests due to the possibility of its technological importance [1] and interesting physics. [2,3] These perovskite oxides have been proposed potential candidates for applications in spintronic devices, chemical sensors, [4,5] high dielectric constants materials, [6,7] magneto-dielectric devices, [8] ultrafast magneto-optical storage devices, [9,10] etc. In RFeO 3 type of perovskite oxides, distortions associated with the FeO 6 octahedra and lattice effects play a key role in various properties in these highly correlated systems.…”

“…[14][15][16] It is now well established that RS is one of the versatile technique not only to investigate the crystal structure but also to study the orbital mediated CT mechanism in doped rare earth orthoferrites. [3,17,18] It is well known that the atomic arrangement with orthorhombic symmetry decompose into Raman active (7A g + 7B 1g + 5 B 2g + 5B 3g ), eight inactive modes (8 A u ), three acoustic translational modes (1 B 1u + 1 B 2u + 1 B 3u ), and 25 IR-active modes (7 B 1u + 9 B 2u + 9 B 3u ). [17,19,20] The Raman modes at lower wavenumber arising around 100 cm −1 are assigned as the soft A g modes.…”

Electrochemical and magnetic properties of electrospun SmFeO3 and SmCoO3 nanofibers

“…As presented in Figure 5A, the magnetization starts to reduce at the temperature below 114 K and sharply decreases at the temperature below 13 K. In addition, the magnetization curve has reached a plateau at the temperature higher than 50 K, and the clear separation of ZFC and FC curves begins at 300 K, indicating the onset of a long‐range ordering Sm 3+ spin magnetic moments 40 . The Néel temperature of SmFeO 3 is 680 K 24 . It is reported that the spin reorientation temperature of SmFeO 3 is in accordance with the blocking temperature, which is between 450 and 480 K 41,42 .…”

“…43 According to Figure 5B, ZFC and FC curves of SmCoO 3 NFs start to depart at 250 K. As a typical perovskite, this obvious bifurcation of ZFC and FC curves at low temperature is mainly ascribed to the short-range ordered ferromagnetic cluster and spin glass behavior. 24 ZFC curve shows a peak at 23 K, indicating the magnetic phase transition from paramagnetism to ferromagnetism. 44 FC curve starts to rise since the temperature is lower than 250 K. ZFC curve starts to decrease at the temperature below 23 K. The inset is the temperature dependence of inverse magnetic susceptibility under the applied magnetic field of 100 Oe.…”