TY  - SER
AU  - Karaman,Ibrahim
AU  - Arróyave,R.
AU  - Salas,D.
AU  - Bruno,Nickolaus M.
AU  - Wang,Y.
AU  - Chisholm,M.F.
AU  - Chi,S.
AU  - Abernathy,D.L.
AU  - Chumlyakov,Yuri I.
AU  - Stonaha,P.J.
AU  - Manley,M.E.
TI  - Glassy phonon heralds a strain glass state in a shape memory alloy
KW  - сплавы с памятью формы
KW  - фононное стекло
KW  - деформация
KW  - статьи в журналах
N1  - Библиогр.: 34 назв
N2  - Shape memory strain glasses are frustrated ferroelastic materials with glasslike slow relaxation and
nanodomains. It is possible to change a NiCoMnIn Heusler alloy from a martensitically transforming alloy
 to a nontransforming strain glass by annealing, but minimal differences are evident in the short- or longrange
 order above the transition temperature—although there is a structural relaxation and a 0.18% lattice
 expansion in the annealed sample. Using neutron scattering we find glasslike phonon damping in the strain
 glass but not the transforming alloy at temperatures well above the transition. Damping occurs in the mode
 with displacements matching the martensitic transformation. With support from first-principles calculations,
 we argue that the strain glass originates not with transformation strain pinning but with a disruption
 of the underlying electronic instability when disorder resonance states cross the Fermi level
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ER  -