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- W2000068209 abstract "To investigate the quantum criticality and spin fluctuations in LaFe 4 As 12 , we have investigated the pressure and magnetic field dependences of electrical resistivity (ρ). The Curie temperature T C (∼5.2 K at ambient pressure) is gradually suppressed by pressure ( P ) and disappears at approximately 2 GPa (∼ P c ). The coefficient A of the T 2 dependence of ρ increases near P c , and the exponent n of ρ( T )∼ρ 0 +β T n changes into 5/3, which is expected for 3d ferromagnetic spin fluctuations. The low-field longitudinal magnetoresistance Δρ/ρ( T ) is negative at low temperatures, as was commonly observed in typical itinerant-electron weak ferromagnets, reflecting a field-suppressed spin-fluctuation scattering. Above T C , it becomes positive and shows a peak against magnetic field, which is hardly ascribable only to the ordinary positive magnetoresistance due to the Lorentz force on conduction electrons. Possible origins of the unexpected positive magnetoresistance are discussed by considering Kohler's plot for both the longitudinal and transverse magnetoresistances." @default.
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- W2000068209 date "2010-06-15" @default.
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- W2000068209 title "Response of Itinerant-Electron Weak Ferromagnet LaFe4As12 to Pressure and Magnetic Field" @default.
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