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首页> 外文期刊>Physical review letters >Observation of a Continuous Phase Transition in a Shape-Memory Alloy
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Observation of a Continuous Phase Transition in a Shape-Memory Alloy

机译：形状记忆合金中连续相变的观察

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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.
机译：在AuZn和Au_（0.52）Zn_（0.48）的单晶上进行了弹性中子散射，非弹性X射线散射，比热和压力相关的电传输测量。弹性中子散射检测到在与每个样品的转变温度相对应的温度（分别为T_M = 64和45 K）下，在Q =（1.33,0.67,0）处出现的新的相应布拉格峰（调制）。尽管新的布拉格峰在Au_（0.52）Zn_（0.48）样品中以不连续的方式出现，但在AuZn中以连续的方式出现。令我们惊讶的是，AuZn Bragg峰强度与温度的相关性以及T_M附近的比热跃变均与连续转变相符。对T_M的压力依赖性的拟合表明，AuZn相图中存在一个临界端点，位于T_M〜* = 2.7 K和p〜* = 3.1 GPa。

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