| 蓝青铜K0.3MoO3单晶Peierls相变研究 |
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| 引用本文： | 殷江,窦敖川,刘治国,冯端.蓝青铜K0.3MoO3单晶Peierls相变研究[J].物理学报,1996,45(11):1824-1829. |
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| 作者姓名： | 殷江 窦敖川 刘治国 冯端 |
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| 作者单位： | (1)南京大学固体微结构物理国家重点实验室; (2)镇江师范专科学校物理系 |
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| 摘 要： | 测量了蓝青铜K0.3MoO3单晶Ｒ-Ｔ曲线，发现曲线在２８０Ｋ左右有异常变化，计算得到１８０Ｋ以下的半导体能隙为１３２０Ｋ（０.１１ｅＶ）．液氮温度下测量了晶体的非线性导电性，得到电场阈值为０.1２９Ｖ／ｃｍ．样品ＤＳＣ研究表明，样品在２４０Ｋ处经历一新的Ｐｅｉｅｒｌｓ相变，且为一级相变，据此对相变的微观性质进行了定量计算．１８０Ｋ附近Δｃp-Ｔ曲线表明，１８０Ｋ处的相变为一个二级相变加一个一级相变
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| 关 键 词： | 蓝青铜 非线性导电性 单晶 相变 |
| 收稿时间： | 1995-09-27 |
A STUDY ON THE PEIERLS TRANSITIONS OF BLUE BRONZE K0.3MoO3 SINGLE CRYSTAL |
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| YIN JIANG,DOU AO-CHUAN,LIU ZHI-GUO and FENG DUAN.A STUDY ON THE PEIERLS TRANSITIONS OF BLUE BRONZE K0.3MoO3 SINGLE CRYSTAL[J].Acta Physica Sinica,1996,45(11):1824-1829. |
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| Authors: | YIN JIANG DOU AO-CHUAN LIU ZHI-GUO and FENG DUAN |
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| Abstract: | K0.3MoO3 single crystals with the size of 2cm×1.5cm×1cm have been grown by electrolytic reduction of K2CO3-MoO3 melt with a K2CO3-to-MoO3 mole ratio of 1 to 4.32. The temperature dependence of normalized resistivity R(T)/R(290K)-T of a K0.3MoO3 single crystal has been determined. It is found that the semiconductor gap of the single crystal is 1320K(0.11eV). The threshold electric field ET is ０.1２９Ｖ／ｃｍ derived from the data of nonlinear conductivity at T=77K．ＤＳＣ study of the samples shows that the K0.3MoO3 single crystal undertakes a new Peierls phase transition around 240K and that the phase transition is of first order. The Δｃp-Ｔ curve shows that the phase transition around T=180K is a combination of a second order and a first. |
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