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K_0.3MoO₃和Tl_0.3MoO₃派尔斯相变临界行为的比热研究

SPECIFIC-HEAT STUDIES OF THE CRITICAL BEHAVIOR FOR K_0.3MoO₃ AND Tl_0.3MoO₃ NEAR PEIERLS TRANSITIONS

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【Author】 QIN XIAO-KUI (Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092)SHI JING(Department of Physics, Wuhan University, Wuhan 430072)CHEN HONG(Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092; National Laboratory

【机构】同济大学波耳固体物理研究所!上海200092；武汉大学物理系!武汉430072；同济大学波耳固体物理研究所!上海200092中国科学院上海技术物理研究所；上海200083；中国科学技术大学结构分析开放研究实验室!合肥230026；武汉大学物理系!武汉430072中国科学院国际材料物理中心；沈阳110015；

【摘要】采用连续绝热加热法测量了K_0.3MoO₃和Tl_0.3MoO₃在100—220K温度范围内的比热。发现K_0.3MoO₃和Tl_0.3MoO₃分别在177.5K和172.3K发生派尔斯相变。对派尔斯相变附近比热临界行为的研究表明,K_0.3MoO₃和Tl_0.3MoO₃的临界区域宽度分别为6K和8K,临界行为属于三维XY模型普适类。更多还原

【Abstract】 Specific heat measurements have been made in K0.3MoO3 and Tl0.3MoO3 using an adiabatic continuous heating method from 100 K to 220 K. It is found that Peierl transitions occur at 177.5 K and 172.3 K for K0.3MoO3 and Tl0.3MoO3 respectively. Analyses of specific heat data near Peierls transitions yield that widths of critical regions are about 6 K and 8 K for K0.3McO3 and Ti0.3MoO3 respectively and the critical behavior belongs to the three dimensional XY model.更多还原