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首页> 外文期刊>Physica, B. Condensed Matter >Chemical potential induced phase transition in the metallic electrode attached to the ferroelectric Pb5Ge3O11 single crystal
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Chemical potential induced phase transition in the metallic electrode attached to the ferroelectric Pb5Ge3O11 single crystal

机译：化学势诱导的与铁电Pb5Ge3O11单晶相连的金属电极中的相变

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The metallic contact electrode was attached to the one surface of the ferroelectric semiconducting Pb5Ge3O11 single crystal and at opposite ends of this electrode wires were glued. A voltage has been applied to the wires and the resistance R of the contact electrode has been measured as function of temperature on heating and cooling. Two series of independent measurements were carried out where the ferroelectric c-axis of the Pb5Ge3O11 uniaxial crystal was perpendicular and parallel to the contact electrode. They revealed change in slope (a kink) of the contact electrode resistance curve at the critical point T-kink 452 K. This result was obtained for both gold and silver electrode materials. The critical temperature Tkink exactly corresponds to the Curie temperature T-C of the transition between the ferroelectric (P3) and paraelectric (P (6) over bar) phases of the Pb5Ge3O11 single crystal. This effect is the evidence that the chemical potential induced secondary phase transition takes place in the electron gas of the contact electrode and it results in the irregularity of the resistance temperature dependence at the critical point. The contact electrode method can be succesfully used to detect the critical temperature without necessity to apply external electric field to the crystal sample. The method works well also in the case of non-metallic materials like Pb5Ge3O11 and not only for metallic samples reported in the literature before. (c) 2006 Elsevier B.V. All rights reserved.
机译：将金属接触电极附着到铁电半导体Pb5Ge3O11单晶的一个表面上，并在该电极的相对端胶合。已经对导线施加了电压，并且已经根据加热和冷却时温度的函数测量了接触电极的电阻R。进行了两个系列的独立测量，其中Pb5Ge3O11单轴晶体的铁电c轴垂直且平行于接触电极。他们揭示了在临界点T-kink 452 K处接触电极电阻曲线的斜率（扭结）变化。对于金和银电极材料均获得了此结果。临界温度Tkink恰好对应于Pb5Ge3O11单晶的铁电（P3）相和顺电（P（6 bar之上））相之间的跃迁居里温度T-C。该效果证明了化学势诱导的二次相变发生在接触电极的电子气中，并且导致在临界点电阻温度依赖性的不规则性。接触电极法可以成功地用于检测临界温度，而无需向晶体样品施加外部电场。该方法在非金属材料（如Pb5Ge3O11）中也适用，不仅适用于以前文献中报道的金属样品。 （c）2006 Elsevier B.V.保留所有权利。

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