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The Fermi surface topology of the shape-memory alloy Ni[0.62]Al[0.38] hasbeen determined using Compton scattering. A large area of this Fermi surfacecan be made to nest with other areas by translation through a vector of ~ 0.18[1,1,0] (2pi/a), which correponds to the wavevector associated with martensiticprecursor phenomena such as phonon softening and diffuse streaking in electrondiffraction patterns. This observation is compelling evidence that thesephenomena are driven by the enhanced electron-lattice coupling due to the Fermisurface nesting

physical review letters

Observation of a Strongly Nested Fermi Surface in the Shape-Memory Alloy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ni</mml:mi><mml:mn>0.62</mml:mn></mml:msub><mml:msub><mml:mi>Al</mml:mi><mml:mn>0.38</mml:mn></mml:msub></mml:math>

Observation of a Strongly Nested Fermi Surface in the Shape-Memory AlloyNi0.62Al0.38