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• W3204208773 abstract "Magnetoelastic coupling, structural, magnetic, electronic transport, and magnetotransport properties of ${mathrm{La}}_{0.85}{mathrm{Ce}}_{0.15}{mathrm{Fe}}_{12}{mathrm{B}}_{6}$ have been studied by a combination of macroscopic [magnetization, electrical resistivity, and magnetoresistance (MR)] and microscopic temperature- and magnetic-field-dependent x-ray powder diffraction measurements. The itinerant-electron system ${mathrm{La}}_{0.85}{mathrm{Ce}}_{0.15}{mathrm{Fe}}_{12}{mathrm{B}}_{6}$ exhibits an antiferromagnetic (AFM) ground state and multiple magnetic transitions, AFM-ferromagnetic (FM) and FM-paramagnetic (PM), triggered by changes in both temperature and magnetic fields. At low temperatures, the field-induced first-order AFM-FM metamagnetic phase transition is discontinuous, manifesting itself by extremely sharp steps in magnetization as well as in MR and is accompanied by large magnetic hysteresis. A remarkably large negative MR of ensuremath{-}73% was discovered. In addition, the time evolution of the electrical resistivity displays a colossal spontaneous jump when both the applied magnetic field and temperature are constant. Diffraction data reveal a magnetic-field-induced structural phase transition associated with the AFM-FM and PM-FM transformations. The lattice distortion is driven by magnetoelastic coupling and converts the crystal structure from rhombohedral ($Roverline{3}m$) to monoclinic $(C2/m)$. The AFM and PM states are related to the rhombohedral structure, whereas the FM order develops in the monoclinic symmetry. A huge volume magnetostriction of ensuremath{sim}0.9% accompanies this symmetry-lowering lattice distortion. Meanwhile, a highly anisotropic thermal expansion involving giant negative thermal expansion with an average volumetric thermal expansion coefficient ${ensuremath{alpha}}_{V}=ensuremath{-}195ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6}phantom{rule{0.16em}{0ex}}{mathrm{K}}^{ensuremath{-}1}$ was observed. The consistency seen in these different experimental data constitutes direct evidence of the strong correlations between charge, magnetic, and crystallographic degrees of freedom in this material." @default.
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• W3204208773 date "2021-10-04" @default.
• W3204208773 modified "2023-10-06" @default.
• W3204208773 title "Magnetic-field-induced structural phase transition and giant magnetoresistance in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>0.85</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ce</mml:mi><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>12</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal>B</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W3204208773 doi "https://doi.org/10.1103/physrevmaterials.5.104401" @default.
• W3204208773 hasPublicationYear "2021" @default.
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