Lattice dynamics in magnetic superelastic Ni-Mn-In alloys: Neutron scattering and ultrasonic experiments

被引：41

作者：

Moya, Xavier ^{[1
]}

Gonzalez-Alonso, David ^{[1
]}

Manosa, Lluis ^{[1
]}

Planes, Antoni ^{[1
]}

Garlea, V. O. ^{[2
]}

Lograsso, T. A. ^{[2
]}

Schlagel, D. L. ^{[2
]}

Zarestky, J. L. ^{[2
]}

Aksoy, Seda ^{[3
]}

Acet, Mehmet ^{[3
]}

机构：

[1] Univ Barcelona, Fac Fis, Dept Estructura & Constituents Mat, E-08028 Barcelona, Catalonia, Spain

[2] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[3] Univ Duisburg Essen, Fachbereich Phys, D-47048 Duisburg, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 21期

关键词：

SHAPE-MEMORY ALLOYS; PREMARTENSITIC PHENOMENA; ELASTIC-CONSTANTS; NI2MNGA; BEHAVIOR; TRANSITION;

D O I：

10.1103/PhysRevB.79.214118

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron scattering and ultrasonic methods have been used to study the lattice dynamics of two single crystals of Ni-Mn-In Heusler alloys close to Ni(50)Mn(34)In(16) magnetic superelastic composition. The paper reports on the experimental determination of the low-lying phonon-dispersion curves and the elastic constants for this alloy system. We found that the frequencies of the TA(2) branch are relatively low and it exhibits a small dip anomaly at a wave number xi(0) approximate to 1/3, which softens with decreasing temperature. Associated with the softening of this phonon, we also observed the softening of the shear elastic constant C' = (C(11)-C(12))/2. Both temperature softenings are typical for bcc-based solids which undergo martensitic transformations and reflect the dynamical instability of the cubic lattice against shearing of {110} planes along < 1 (1) over bar0 > directions. Additionally, we measured low-lying phonon-dispersion branches and elastic constants in applied magnetic fields aimed to characterize the magnetoelastic coupling.

引用

页数：7

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