Zeng Q S, Li Y C, Feng C M, Liermann P, Somayazulu M, Shen G Y, Mao H-K, Yang R, Liu J, Hu T D, Jiang J Z
International Center for New-Structured Materials and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Proc Natl Acad Sci U S A. 2007 Aug 21;104(34):13565-8. doi: 10.1073/pnas.0705999104. Epub 2007 Aug 14.
In situ high-pressure x-ray diffraction, low-temperature resistivity, and magnetization experiments were performed on a La(32)Ce(32)Al(16)Ni(5)Cu(15) bulk metallic glass (BMG). A sudden change in compressibility at approximately 14 GPa and a rapid increase of resistivity at approximately 12 K were detected, whereas magnetic phase transformation and magnetic field dependence of the low-temperature resistivity do not occur at temperatures down to 4.2 K. An interaction between conduction electrons and the two-level systems is suggested to explain the temperature and field dependences of resistivity of the BMG alloy. Although the cause of the unusual change in compressibility at approximately 14 GPa is not clear, we believe that it could be linked with the unique electron structure of cerium in the amorphous matrix. An electronic phase transition in BMG alloys, most likely a second-order amorphous-to-amorphous phase transition, is suggested.
对La(32)Ce(32)Al(16)Ni(5)Cu(15)块状金属玻璃（BMG）进行了原位高压X射线衍射、低温电阻率和磁化实验。检测到在约14 GPa时压缩性突然变化，在约12 K时电阻率迅速增加，而在低至4.2 K的温度下未发生磁相变和低温电阻率的磁场依赖性。有人提出传导电子与双能级系统之间的相互作用来解释BMG合金电阻率的温度和场依赖性。尽管约14 GPa时压缩性异常变化的原因尚不清楚，但我们认为这可能与非晶基体中铈的独特电子结构有关。有人提出BMG合金中存在电子相变，很可能是二级非晶态到非晶态的相变。
