Relation between Diffuse Scatterings and Fermi Surface Nesting in Iron Doped Ti-Ni Alloys

Abstract:

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We have studied diffuse scatterings appearing in Ti-(50-x)Ni-xFe (x = 6, 7, 8, 10) alloy, which shows negative temperature coefficient in electrical resistivity below a temperature Tmin. Electron diffraction pattern of each alloy exhibits diffuse scatterings below Tmin on cooling. The intensity maximum of the diffuse scatterings is located at an incommensurate position of g+<ζζ0>, where g represents reciprocal lattice points of the B2-phase. The value ζ is slightly smaller than 1/3 and decreases with increasing Fe content. The diffuse scatterings of the present alloys are well explained by the nesting effect of the Fermi surface in the B2-type structure, i.e., ζ of each alloy agrees with the length of nesting vector in the [110] direction, which is evaluated by a first-principle calculation.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

2337-2340

DOI:

10.4028/www.scientific.net/MSF.561-565.2337

Citation:

T. Yamamoto et al., "Relation between Diffuse Scatterings and Fermi Surface Nesting in Iron Doped Ti-Ni Alloys", Materials Science Forum, Vols. 561-565, pp. 2337-2340, 2007

Online since:

October 2007

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$35.00

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