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arXiv 0812.2128cond-mat.str-el
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MnSi磁相变的超声研究

Ultrasonic studies of the magnetic phase transition in MnSi

A. E. Petrova, S. M. Stishov

摘要:

在4-150 K温度范围内测量了MnSi单晶中的声速。弹性常数,控制传播的纵波揭示了显着的软化温度约为29.6 K和$\sim$ 28.8 K,这对应于在MnSi的磁性相变小的不连续性。与此相反,剪切弹性模量不显示任何软化在所有,只反应的小体积变形所造成的磁体积效应。目前的超声波研究揭示了一个重要的事实,即磁性相变在MnSi,发生在28.8 K,只是一个小的特点,全球的转变标志着由四舍五入的最大值或最小值的热容,热膨胀系数,声速和吸收,以及电阻率的温度导数。

英文摘要:

Measurements of the sound velocities in a single crystal of MnSi were performed in the temperature range 4-150 K. Elastic constants, controlling propagation of longitudinal waves reveal significant softening at a temperature of about 29.6 K and small discontinuities at $\sim$28.8 K, which corresponds to the magnetic phase transition in MnSi. In contrast the shear elastic moduli do not show any softening at all, reacting only to the small volume deformation caused by the magneto-volume effect. The current ultrasonic study exposes an important fact that the magnetic phase transition in MnSi, occurring at 28.8 K, is just a minor feature of the global transformation marked by the rounded maxima or minima of heat capacity, thermal expansion coefficient, sound velocities and absorption, and the temperature derivative of resistivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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