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http://hdl.handle.net/2445/135979
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 Experiments Particle physics Experiments |
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: https://doi.org/10.1103/PhysRevLett.100.165703 |
It is part of: | Physical Review Letters, 2008, vol. 100, num. 16, p. 165703 |
URI: | http://hdl.handle.net/2445/135979 |
Related resource: | https://doi.org/10.1103/PhysRevLett.100.165703 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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