Lattice dynamics of Ni-Mn-Al Heusler alloys

X. Moya; Ll Mañosa; A. Planes; T. Krenke; M. Acet; E. F. Wassermann; M. Morin; V. O. Garlea; T. A. Lograsso; J. L. Zarestky

doi:10.1016/j.msea.2006.12.217

Lattice dynamics of Ni-Mn-Al Heusler alloys

X. Moya, Ll Mañosa, A. Planes, T. Krenke, M. Acet, E. F. Wassermann, M. Morin, V. O. Garlea, T. A. Lograsso, J. L. Zarestky

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We have studied the lattice dynamics of a Ni₅₄Mn₂₃Al₂₃ (at.%) Heusler single-crystalline alloy by means of neutron scattering and ultrasonic techniques. Results show the existence of a number of precursor phenomena. We have found an anomaly (dip) in the low TA₂ phonon branch at the wave number ξ₀ ≈ 0.33 (in reciprocal lattice units) that becomes more pronounced (phonon softening) with decreasing temperature. We have also observed softening of the associated shear elastic constant (C^′) with decreasing temperature. Ultrasonic measurements under applied magnetic field, both isothermally and varying the temperature show that the values of elastic constants depend on magnetic order thus evidencing magnetoelastic coupling.

Original language	English
Pages (from-to)	227-230
Number of pages	4
Journal	Materials Science and Engineering: A
Volume	481-482
Issue number	1-2 C
DOIs	https://doi.org/10.1016/j.msea.2006.12.217
State	Published - May 25 2008
Externally published	Yes

Funding

This work received financial support from the CICyT (Spain), Project No. MAT2004-01291, Marie-Curie RTN MULTIMAT (EU), Contract No. MRTN-CT-2004-505226, DURSI (Catalonia), Project No. 2005SGR00969 and from the Deutsche Forschungsgemeinschaft (GRK 277). X.M. acknowledges support from DGICyT (Spain). Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. W-7405- Eng-82. The work at Ames was supported by the Director for Energy Research, Office of Basic Energy Sciences.

Funders	Funder number
DGICyT
U.S. Department of Energy
Basic Energy Sciences
Iowa State University	W-7405- Eng-82
FP7 People: Marie-Curie Actions	MRTN-CT-2004-505226
Deutsche Forschungsgemeinschaft	GRK 277
Departament d'Universitats, Recerca i Societat de la Informació
Comisión Interministerial de Ciencia y Tecnología	MAT2004-01291
Institute for Bioengineering of Catalonia	2005SGR00969

Keywords

Elastic constants
Heusler alloy
Magnetoelastic coupling
Neutron scattering
Ni-Mn-Al
Precursor phenomena

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10.1016/j.msea.2006.12.217

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title = "Lattice dynamics of Ni-Mn-Al Heusler alloys",

abstract = "We have studied the lattice dynamics of a Ni54Mn23Al23 (at.%) Heusler single-crystalline alloy by means of neutron scattering and ultrasonic techniques. Results show the existence of a number of precursor phenomena. We have found an anomaly (dip) in the low TA2 phonon branch at the wave number ξ0 ≈ 0.33 (in reciprocal lattice units) that becomes more pronounced (phonon softening) with decreasing temperature. We have also observed softening of the associated shear elastic constant (C′) with decreasing temperature. Ultrasonic measurements under applied magnetic field, both isothermally and varying the temperature show that the values of elastic constants depend on magnetic order thus evidencing magnetoelastic coupling.",

keywords = "Elastic constants, Heusler alloy, Magnetoelastic coupling, Neutron scattering, Ni-Mn-Al, Precursor phenomena",

author = "X. Moya and Ll Ma{\~n}osa and A. Planes and T. Krenke and M. Acet and Wassermann, {E. F.} and M. Morin and Garlea, {V. O.} and Lograsso, {T. A.} and Zarestky, {J. L.}",

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AU - Moya, X.

AU - Mañosa, Ll

AU - Planes, A.

AU - Krenke, T.

AU - Acet, M.

AU - Wassermann, E. F.

AU - Morin, M.

AU - Garlea, V. O.

AU - Lograsso, T. A.

AU - Zarestky, J. L.

PY - 2008/5/25

Y1 - 2008/5/25

N2 - We have studied the lattice dynamics of a Ni54Mn23Al23 (at.%) Heusler single-crystalline alloy by means of neutron scattering and ultrasonic techniques. Results show the existence of a number of precursor phenomena. We have found an anomaly (dip) in the low TA2 phonon branch at the wave number ξ0 ≈ 0.33 (in reciprocal lattice units) that becomes more pronounced (phonon softening) with decreasing temperature. We have also observed softening of the associated shear elastic constant (C′) with decreasing temperature. Ultrasonic measurements under applied magnetic field, both isothermally and varying the temperature show that the values of elastic constants depend on magnetic order thus evidencing magnetoelastic coupling.

AB - We have studied the lattice dynamics of a Ni54Mn23Al23 (at.%) Heusler single-crystalline alloy by means of neutron scattering and ultrasonic techniques. Results show the existence of a number of precursor phenomena. We have found an anomaly (dip) in the low TA2 phonon branch at the wave number ξ0 ≈ 0.33 (in reciprocal lattice units) that becomes more pronounced (phonon softening) with decreasing temperature. We have also observed softening of the associated shear elastic constant (C′) with decreasing temperature. Ultrasonic measurements under applied magnetic field, both isothermally and varying the temperature show that the values of elastic constants depend on magnetic order thus evidencing magnetoelastic coupling.

KW - Elastic constants

KW - Heusler alloy

KW - Magnetoelastic coupling

KW - Neutron scattering

KW - Ni-Mn-Al

KW - Precursor phenomena

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EP - 230

JO - Materials Science and Engineering: A

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IS - 1-2 C

ER -

Lattice dynamics of Ni-Mn-Al Heusler alloys

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Keywords

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