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首页> 外文期刊>Physical review >Electronic properties of the organic metals Θ-(BEDT-TTF)_2I_3 and Θ_T-(BEDT-TTF)_2I_3
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Electronic properties of the organic metals Θ-(BEDT-TTF)_2I_3 and Θ_T-(BEDT-TTF)_2I_3

机译：有机金属Θ-（BEDT-TTF）_2I_3和Θ_T-（BEDT-TTF）_2I_3的电子性质

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Investigations of the structures and electronic properties of neat single crystals of the organic metals Θ-(BEDT-TTF)_2I_3 and Θ_T-(BEDT-TTF)_2I_3—a tempered phase of Θ-(BEDT-TTF)_2I_3—are presented and compared. It will be shown that in contrast to the Θ-phase crystals, where only 30% of the crystals become superconducting at 3.6 K, all crystals of the Θ_T-phase become superconducting at about 5 K. The origin for this behavior is discussed. Temperature-dependent resistivity and susceptibility measurements as well as electron spin resonance investigations of both types of crystals are presented and discussed. The Fermi surfaces of both materials were investigated by de Haas van Alphen and Shubnikov de Haas experiments at 0.4 K. The results are compared with predictions of a band structure calculation as well as experiments on a similar material, namely, Θ-(BEDT-TTF)_2(I)3)_(1-x)(AuI_2)_x(x < 0.02), known from literature. In addition, the effective masses of two orbits of Θ-(BEDT-TTF)_2I_3 were investigated as a function of the angle of the magnetic field with respect to the conducting planes. Furthermore, it will be shown that in high magnetic fields "inverse" saw-tooth oscillations in magnetization in Θ-(BEDT-TTF)_2I_3 crystals occur, whereas in Θ_T-(BEDT-TTF)_2I_3 crystals under the same conditions, very symmetric oscillations are observed. The origin of the "inverse" saw-tooth is discussed and magnetic interaction as the most probable origin is proposed.
机译：提出并比较了有机金属Θ-（BEDT-TTF）_2I_3和Θ_T-（BEDT-TTF）_2I_3（θ-（BEDT-TTF）_2I_3的回火相）纯单晶的结构和电子性质的研究。 。可以看出，与Θ相晶体相比，其中只有30％的晶体在3.6 K时超导，而ΘT相的所有晶体在5 K时超导。讨论了这种行为的起因。提出并讨论了两种类型晶体的随温度变化的电阻率和磁化率测量值以及电子自旋共振研究。通过de Haas van Alphen和Shubnikov de Haas实验在0.4 K下研究了两种材料的费米表面。将结果与能带结构计算的预测以及类似材料Θ-（BEDT-TTF的实验）进行了比较。 ）_2（I）3）_（1-x）（AuI_2）_x（x <0.02），从文献中得知。此外，根据磁场相对于导电平面的角度，研究了Θ-（BEDT-TTF）_2I_3两个轨道的有效质量。此外，将显示出，在高磁场中，在Θ-（BEDT-TTF）_2I_3晶体中发生磁化过程中的“反”锯齿振荡，而在相同条件下的Θ_T-（BEDT-TTF）_2I_3晶体中出现非常对称的观察到振荡。讨论了“反”锯齿的起源，并提出了磁性相互作用作为最可能的起源。

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