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二维钾、钠紫青铜单晶A0.9Mo6O17(A=K,Na)的热电势特性

田明亮 毛志强 王瑞萍 王业斌 张裕恒

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二维钾、钠紫青铜单晶A0.9Mo6O17(A=K,Na)的热电势特性

田明亮, 毛志强, 王瑞萍, 王业斌, 张裕恒

THERMOELECTRIC POWER PROPERTIES OF QUASI TWO DIMENSIONAL POTASSIUM/SODIUM PURPLE BRONZE- CRYSTALS A0.9MoO17(A=K,Na)

TIAN MING-LIANG, MAO ZHI-QIANG, WANG RUI-PING, WANG YE-BIN, ZHANG YU-HENG
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  • 在80—280K范围内对准二维钾、钠紫青铜单晶的热电势与温度的关系进行了研究,发现:(1)对钾紫青铜,在105K附近热电势有符号变化,并且在高温正常金属相,热电势S具有较小的负值,可以用经验关系S=AT+B来描述,自由电子为支配载流子;而在T<105K的低温CDW态,S为正值,可表示为S=A′T+B′/T的形式,载流子的声子曳引热电势占支配作用.(2)对钠紫青铜,在T>80K范围内S与T具有很好的线性关系,没有观察到Peierls相变,电子为支配载流子.对造成两者差异的根源,也作了初步探讨
    Temperature dependence of thermoelectric power S in quasi-two dimensional potassium/sodium purple bronzes has been studied in the temperature range 80—280K.It′s found that:(1)in potassium purple bronze,S has a sign change at 105K,above which S is the small negative value and can be described by the form of S=AT+B,the dominant carriers are free electrons,in the CDW state below 105K,S is positive,and can be described by S=A′T+B′/T,the phonon-drag of the carriers is dominant; (2)in sodium purple bronze,in the studied temperature range above 80K,S has a good linear relation with temperature,no phase transition was observed,electrons may be the dominant carriers.In addition,the origins of the difference of the properties for both these isostructural crystals are also discussed briefly.
    • 基金项目: 国家自然科学青年基金资助的课题.
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  • 文章访问数:  6165
  • PDF下载量:  572
  • 被引次数: 0
出版历程
  • 收稿日期:  1995-08-17
  • 修回日期:  1995-10-24
  • 刊出日期:  1997-01-20

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