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Combined Experimental and Theoretical Investigation of the Premartensitic Transition in Ni2 MnGa

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Ultraviolet-photoemission (UPS) measurements and supporting specific-heat, thermal-expansion, resistivity, and magnetic-moment measurements are reported for the magnetic shape-memory alloy Ni 2 MnGa over the temperature range 100 < T < 250     K . All measurements detect clear signatures of the premartensitic transition ( T PM ∼ 247     K ) and the martensitic transition ( T M ∼ 196     K ). Temperature-dependent UPS shows a dramatic depletion of states (pseudogap) at T PM located 0.3 eV below the Fermi energy. First-principles electronic structure calculations show that the peak observed at 0.3 eV in the UPS spectra for T > T PM is due to the Ni d minority-spin electrons. Below T M this peak disappears, resulting in an enhanced density of states at energies around 0.8 eV. This enhancement reflects Ni d and Mn d electronic contributions to the majority-spin density of states.

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Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Combined Experimental and Theoretical Investigation of the Premartensitic Transition in Ni2 MnGa