Observation of Phasons in Magnetic Shape Memory Alloy Ni2MnGa
S. M. Shapiro, P. Vorderwisch, K. Habicht, K. Hrdil, H. Schneider
TL;DR
This study uses inelastic neutron scattering to detect and analyze phasons linked to charge density waves in the martensite phase of Ni2MnGa, revealing their properties and temperature dependence.
Contribution
It provides the first direct observation and detailed characterization of phasons in a magnetic shape memory alloy, connecting lattice dynamics with electronic structure features.
Findings
Detection of well-defined phasons in Ni2MnGa
Measurement of phason velocity and temperature dependence
Observation of anomalous [110]-TA2 phonon behavior
Abstract
An inelastic neutron scattering study of the lattice dynamics of the martensite phase of the ferromagnetic shape memory alloy, Ni2MnGa, reveals the presence of well-defined phasons associated with the charge density wave (CDW) resulting from Fermi surface (FS) nesting. The velocity and the temperature dependence of the phason are measured as well as the anomalous [110]-TA2 phonon.
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