Evidence for a coupled magnetic-crystallographic transition in La0.9Ce0.1Fe12B6

Abstract

Competition between antiferromagnetic (AFM), paramagnetic (PM), and ferromagnetic (FM) states in La 0.9 Ce 0.1 Fe 12 B 6 compound is investigated by means of temperature-and magnetic field-dependent x-ray diffraction, magnetization, linear thermal expansion, and magnetostriction experiments. It is shown that both AFM and PM phases get converted into the FM phase via a first-order metamagnetic transition, which is accompanied by a huge forced-volume magnetostriction V/V (25 K, 6 T) = 1.15%. X-ray powder diffraction reveals a magnetic field-induced crystallographic phase transition from a R 3m rhombohedral (AFM, PM) to a C2/m monoclinic (FM) structure. A peculiarly anisotropic lattice expansion as well as giant negative thermal expansion with a volumetric thermal expansion coefficient α V = −193 × 10 -6 K -1 are observed. These findings point to the significance of magnetoelastic effects in this metamagnet and illustrate the strength of the coupling between lattice and spin degrees of freedom in the La 0.9 Ce 0.1 Fe 12 B 6 intermetallic compound.

Large piezoelectric response in ferroelectric/multiferroelectric metal oxyhalide MOX2 (M = Ti, V and X = F, Cl and Br) monolayers

“…du 1 dη 1 or du 1 dη 2 represents the change of the atomic coordinates along the a-direction in response to a strain along the a-direction 49 We find that the TFFOM of MOX 2 monolayers is remarkably higher than that of niobium oxyhalide monolayers, 49 As VOCl 2 and VOBr 2 monolayers have an AFM ground state, we also study how their piezo-response will change in response to the AFM-to-FM phase transition, which can be experimentally possible under an external magnetic field. 54 Note that the FM-to-AFM transition can be a challenge in experiments. We find that the AFM1-to-FM transition somewhat increases the elastic constantsespecially C 22thus slightly decreases d 11 .…”

Magnetic Field‐Oriented Electrical Transport Properties in Antiperovskite Mn3SnC

“…For Mn 3 SnC, the gigantic physical properties' changing includes but is not limited to spin-flip scattering steep changing, Mn magnetic moments, conductive electrons' interaction, and magnetic structure changing. [21] Moreover, the phase transitions are usually accompanied by a magnitude of the entropy change, which is related to the amount of order that is lost or gained during this transition. [5][6][7][8][9][10][11] The IP field-oriented FMR of the 3 Â 5 mm 2 Mn 3 SnC film is shown in Figure 4.…”

“…We conjecture that these abnormal features in the vicinity of phase transition temperature relate to a strong interaction of Mn magnetic moments with conductive electrons. [ 21 ] Hence, to further explore this resistivity difference under different IP magnetic field directions, the angular dependence of resistivity ρ xx was investigated around the phase transition temperature in Figure .…”

Effect of Mn doping and charge transfer on LaTi1−x Mn x O3

“…Transition-metal oxides exhibit a variety of interesting functionality including giant-magnetoresistance [1,2] high-T c superconducting [3,4], and metal-insulator transitions [5,6]. Interplay of spin, charge, orbital and lattice degrees of freedom in transition metal-oxides gives rise to a variety of complex ground states exhibiting rich structural, magnetic, transport and optical properties [7].…”