Observation of a continuous phase transition in a shape-memory alloy

J. C. Lashley; S. M. Shapiro; B. L. Winn; C. P. Opeil; M. E. Manley; A. Alatas; W. Ratcliff; T. Park; R. A. Fisher; B. Mihaila; P. Riseborough; E. K.H. Salje; J. L. Smith

doi:10.1103/PhysRevLett.101.135703

Observation of a continuous phase transition in a shape-memory alloy

J. C. Lashley, S. M. Shapiro, B. L. Winn, C. P. Opeil, M. E. Manley, A. Alatas, W. Ratcliff, T. Park, R. A. Fisher, B. Mihaila, P. Riseborough, E. K.H. Salje, J. L. Smith

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Abstract

Elastic neutron-scattering, inelastic x-ray scattering, specific-heat, and pressure-dependent electrical transport measurements have been made on single crystals of AuZn and Au0.52Zn0.48. Elastic neutron scattering detects new commensurate Bragg peaks (modulation) appearing at Q=(1.33,0.67,0) at temperatures corresponding to each sample's transition temperature (TM=64 and 45/K, respectively). Although the new Bragg peaks appear in a discontinuous manner in the Au0.52Zn0.48 sample, they appear in a continuous manner in AuZn. Surprising us, the temperature dependence of the AuZn Bragg peak intensity and the specific-heat jump near TM are in favorable accord with a continuous transition. A fit to the pressure dependence of TM suggests the presence of a critical end point in the AuZn phase diagram located at TM*=2.7K and p*=3.1GPa.

Original language	English
Article number	135703
Journal	Physical Review Letters
Volume	101
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.101.135703
State	Published - Sep 26 2008

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10.1103/PhysRevLett.101.135703

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title = "Observation of a continuous phase transition in a shape-memory alloy",

abstract = "Elastic neutron-scattering, inelastic x-ray scattering, specific-heat, and pressure-dependent electrical transport measurements have been made on single crystals of AuZn and Au0.52Zn0.48. Elastic neutron scattering detects new commensurate Bragg peaks (modulation) appearing at Q=(1.33,0.67,0) at temperatures corresponding to each sample's transition temperature (TM=64 and 45/K, respectively). Although the new Bragg peaks appear in a discontinuous manner in the Au0.52Zn0.48 sample, they appear in a continuous manner in AuZn. Surprising us, the temperature dependence of the AuZn Bragg peak intensity and the specific-heat jump near TM are in favorable accord with a continuous transition. A fit to the pressure dependence of TM suggests the presence of a critical end point in the AuZn phase diagram located at TM*=2.7K and p*=3.1GPa.",

author = "Lashley, {J. C.} and Shapiro, {S. M.} and Winn, {B. L.} and Opeil, {C. P.} and Manley, {M. E.} and A. Alatas and W. Ratcliff and T. Park and Fisher, {R. A.} and B. Mihaila and P. Riseborough and Salje, {E. K.H.} and Smith, {J. L.}",

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doi = "10.1103/PhysRevLett.101.135703",

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AU - Lashley, J. C.

AU - Shapiro, S. M.

AU - Winn, B. L.

AU - Opeil, C. P.

AU - Manley, M. E.

AU - Alatas, A.

AU - Ratcliff, W.

AU - Park, T.

AU - Fisher, R. A.

AU - Mihaila, B.

AU - Riseborough, P.

AU - Salje, E. K.H.

AU - Smith, J. L.

PY - 2008/9/26

Y1 - 2008/9/26

N2 - Elastic neutron-scattering, inelastic x-ray scattering, specific-heat, and pressure-dependent electrical transport measurements have been made on single crystals of AuZn and Au0.52Zn0.48. Elastic neutron scattering detects new commensurate Bragg peaks (modulation) appearing at Q=(1.33,0.67,0) at temperatures corresponding to each sample's transition temperature (TM=64 and 45/K, respectively). Although the new Bragg peaks appear in a discontinuous manner in the Au0.52Zn0.48 sample, they appear in a continuous manner in AuZn. Surprising us, the temperature dependence of the AuZn Bragg peak intensity and the specific-heat jump near TM are in favorable accord with a continuous transition. A fit to the pressure dependence of TM suggests the presence of a critical end point in the AuZn phase diagram located at TM*=2.7K and p*=3.1GPa.

AB - Elastic neutron-scattering, inelastic x-ray scattering, specific-heat, and pressure-dependent electrical transport measurements have been made on single crystals of AuZn and Au0.52Zn0.48. Elastic neutron scattering detects new commensurate Bragg peaks (modulation) appearing at Q=(1.33,0.67,0) at temperatures corresponding to each sample's transition temperature (TM=64 and 45/K, respectively). Although the new Bragg peaks appear in a discontinuous manner in the Au0.52Zn0.48 sample, they appear in a continuous manner in AuZn. Surprising us, the temperature dependence of the AuZn Bragg peak intensity and the specific-heat jump near TM are in favorable accord with a continuous transition. A fit to the pressure dependence of TM suggests the presence of a critical end point in the AuZn phase diagram located at TM*=2.7K and p*=3.1GPa.

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Observation of a continuous phase transition in a shape-memory alloy

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