Nonlinear electronic transport in the anomalous metallic state of quasi‐2D organic superconductors κ‐(BEDT‐TTF)2X

Nonlinear electronic transport in the anomalous metallic state of quasi‐2D organic superconductors κ‐(BEDT‐TTF)2X
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准二维有机超导体异常金属态下的非线性电子输运 γ(BEDTâTTF)2X

DOI:
10.1002/pssb.201200901
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发表时间:
2013
期刊:
physica status solidi (b)
影响因子:
--
通讯作者:
J. Müller
J. Müller
中科院分区:
--
文献类型:
--
作者:
R. Rommel;B. Hartmann;J. Brandenburg;J.A. Schlueter;J. Müller

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我们在交流电子输运测量中测量了一次和三次谐波电压响应,分别代表准二维(2D)有机超导体κ-(BEDT-TTF)2X的线性(欧姆)和非线性电阻率。非线性输运是探测高质量单晶中电子系统微观几何结构的灵敏工具。对于标题化合物,在Mott金属-绝缘体(MI)转变和临界端点附近的正常导电金属态是非常不寻常的。我们的研究结果揭示了大电流诱导的本征不均匀性,在高电流密度下,在所谓的T * 异常处最明显,这是异常金属态的特征。观察到的非线性层间传输不依赖于频率,不能归因于一个简单的焦耳加热机制的电阻网络。此外,我们发现的证据支持的概念,电子相分离诱导的莫特临界端点。所观察到的产生的三次谐波电压对电流密度的依赖性揭示了一种系统性行为,表明电流诱导的电子不均匀性对于更强相关的系统更明显。
We present measurements of the first‐ and third‐harmonic voltage response in ac electronic transport measurements, representing the linear (ohmic) and nonlinear resistivity, respectively, of the quasi‐two‐dimensional (2D) organic superconductors κ‐(BEDT‐TTF)2X. Nonlinear transport is a sensitive tool to probe the microgeometry of the electronic system in high‐quality single crystals. For the title compounds, the normalconducting metallic state in the vicinity of the Mott metal–insulator (MI) transition and critical endpoint is known to be highly unusual. Our results reveal large current‐induced intrinsic inhomogeneities, at high current densities most pronounced at the so‐calledT* anomaly, which characterizes the anomalous metallic state. The observed nonlinearities in the interlayer transport do not depend on frequency and cannot be ascribed to a simple Joule heating mechanism in a resistor network. Furthermore, we find evidence supporting the notion of electronic phase separation induced by the Mott critical endpoint. The observed dependence of the generated third‐harmonic voltage on the current density reveals a systematic behavior suggesting that current‐induced electronic inhomogeneities are more pronounced for more strongly correlated systems.
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