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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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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.. Combined Experimental and Theoretical Investigation of the Premartensitic Transition in Ni2 MnGa. _Physical Review Letters_. 2008. Vol. 100, núm. 16, pàgs. 165703. [consulta: 21 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/135979]