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00925njm 22002777a 4500 dc Opeil, C. P. author Mihaila, B. author Schulze, R. K. author Mañosa, Lluís author Planes Vila, Antoni author Hults, W. L. author Fisher, R. A. author Riseborough, P. S. author Littlewood, P. B. author Smith, J. L. author Lashley, J. C. author 2019-06-27T13:07:20Z 2019-06-27T13:07:20Z 2008-04-23 2019-06-27T13:07:20Z 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. Física de partícules Experiments Particle physics Experiments Combined Experimental and Theoretical Investigation of the Premartensitic Transition in Ni2 MnGa