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    Combined experimental and theoretical investigation of the premartensitic transition in Ni2MnGa

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    Genre
    Journal Article
    Date
    2008-04-23
    Author
    Opeil, CP
    Mihaila, B
    Schulze, RK
    Mañosa, L
    Planes, A
    Hults, WL
    Fisher, RA
    Riseborough, PS
    Littlewood, PB
    Smith, JL
    Lashley, JC
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    Subject
    cond-mat.mtrl-sci
    cond-mat.mtrl-sci
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/6088
    
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    DOI
    10.1103/PhysRevLett.100.165703
    Abstract
    Ultraviolet-photoemission (UPS) measurements and supporting specific-heat, thermal-expansion, resistivity, and magnetic-moment measurements are reported for the magnetic shape-memory alloy Ni2MnGa over the temperature range 100<T<250K. All measurements detect clear signatures of the premartensitic transition (TPM∼247K) and the martensitic transition (TM∼196K). Temperature-dependent UPS shows a dramatic depletion of states (pseudogap) at TPM 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>TPM is due to the Ni d minority-spin electrons. Below TM 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. © 2008 The American Physical Society.
    Citation to related work
    American Physical Society (APS)
    Has part
    Physical Review Letters
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/6070
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