Superconducting fluctuations in organic molecular metals enhanced by Mott criticality.
Superconducting fluctuations in organic molecular metals enhanced by Mott criticality.
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DOI：
10.1038/srep03390
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发表时间：
2013-12-02
影响因子：
4.6
通讯作者：
Ardavan, Arzhang
中科院分区：
文献类型：
--
作者：
Nam, Moon-Sun;Meziere, Cecile;Batail, Patrick;Zorina, Leokadiya;Simonov, Sergey;Ardavan, Arzhang
非常规超导通常发生在带宽或掺杂等参数的微小变化会导致反铁磁或莫特绝缘相的材料中。随着这些竞争相的接近，超导体的特性往往变得越来越奇特。例如，在有机超导体和欠掺杂高 Tc 铜酸盐超导体中，波动超导状态持续到显着高于 Tc 的温度。通过研究 κ-(BEDT-TTF)2X 族准二维有机分子金属合金，我们揭示了能斯特效应（超导相涨落的敏感探针）如何在极端莫特临界状态下演化。我们发现强有力的证据表明，随着相图通过超导性走向莫特态，超导涨落的温标急剧增加，最终接近准粒子完全可识别的温度。
Unconventional superconductivity typically occurs in materials in which a small change of a parameter such as bandwidth or doping leads to antiferromagnetic or Mott insulating phases. As such competing phases are approached, the properties of the superconductor often become increasingly exotic. For example, in organic superconductors and underdoped high-Tc cuprate superconductors a fluctuating superconducting state persists to temperatures significantly above Tc. By studying alloys of quasi-two-dimensional organic molecular metals in the κ-(BEDT-TTF)2X family, we reveal how the Nernst effect, a sensitive probe of superconducting phase fluctuations, evolves in the regime of extreme Mott criticality. We find strong evidence that, as the phase diagram is traversed through superconductivity towards the Mott state, the temperature scale for superconducting fluctuations increases dramatically, eventually approaching the temperature at which quasiparticles become identifiable at all.
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