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Title: Combined Experimental and Theoretical Investigation of the Premartensitic Transition in Ni2 MnGa
Author: Opeil, C. P.
Mihaila, B.
Schulze, R. K.
Mañosa, Lluís
Planes Vila, Antoni
Hults, W. L.
Fisher, R. A.
Riseborough, P. S.
Littlewood, P. B.
Smith, J. L.
Lashley, J. C.
Keywords: Física de partícules
Particle physics
Issue Date: 23-Apr-2008
Publisher: American Physical Society
Abstract: 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.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2008, vol. 100, num. 16, p. 165703
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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