Combined experimental and theoretical investigation of the premartensitic transition in Ni2MnGa
Permanent link to this recordhttp://hdl.handle.net/20.500.12613/6088
MetadataShow full item record
AbstractUltraviolet-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 workAmerican Physical Society (APS)
Has partPhysical Review Letters
ADA complianceFor Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact email@example.com