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

被引：27

作者：

Lashley, J. C. ^{[1
]}

Shapiro, S. M. ^{[2
]}

Winn, B. L. ^{[3
]}

Opeil, C. P. ^{[4
]}

Manley, M. E. ^{[5
]}

Alatas, A. ^{[6
]}

Ratcliff, W. ^{[7
]}

Park, T. ^{[1
,8
]}

Fisher, R. A. ^{[1
]}

Mihaila, B. ^{[1
]}

Riseborough, P. ^{[9
]}

Salje, E. K. H. ^{[10
]}

Smith, J. L. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[7] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[8] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[9] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

[10] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 13期

基金：

美国能源部;

关键词：

D O I：

10.1103/PhysRevLett.101.135703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Elastic neutron-scattering, inelastic x-ray scattering, specific-heat, and pressure-dependent electrical transport measurements have been made on single crystals of AuZn and Au(0.52)Zn(0.48). 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 (T(M) = 64 and 45 K, respectively). Although the new Bragg peaks appear in a discontinuous manner in the Au(0.52)Zn(0.48) 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 T(M) are in favorable accord with a continuous transition. A fit to the pressure dependence of T(M) suggests the presence of a critical end point in the AuZn phase diagram located at T(M)* = 2.7 K and p* = 3.1 GPa.

引用

页数：4

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