我们进行了Bi2Sr2CaCu2Oy(Bi2212)单晶变温X射线衍射(XRD)研究,定量给出温度从77K变化至300K时,c轴晶格参数和0038主峰的半高宽(FWHM)Δθ的变化.实验发现,从77K至140K,晶格参数c值变化是线性的,随温度较慢地单调增大;从140K附近至300K,c值的变化偏离了原来的线性,随温度较快地单调增大.另外,0038主峰的半高宽Δθ随温度的变化在140K附近出现一个极大值.这表明Bi2212单晶在140K附近发生了明显的反常结构变化.
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