Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system kappa-(BEDT-TTF)2Cu[N(CN) 2]Cl.
Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system kappa-(BEDT-TTF)2Cu[N(CN) 2]Cl.
复制标题
层状有机莫特系统 kappa-(BEDT-TTF)2Cu[N(CN) 2]Cl 中磁场诱导超导渗流区域的交叉。
DOI：
--
复制
发表时间：
2009
影响因子：
8.6
通讯作者：
J. Schlueter
中科院分区：
文献类型：
--
作者：
J. Müller;J. Brandenburg;J. Schlueter
用涨落光谱法研究了有机带宽控制的Mott体系kappa-（BEDT-TTF）（2）Cu[N（CN）（2）]Cl。我们发现的反铁磁绝缘和超导状态的空间非均匀共存区域的反铁磁型超导性的证据。当超导转变由磁场驱动时，从上方接近T（c）（B）时，渗流似乎由不稳定的超导团簇主导，然后在低场下恢复“经典”类型的渗流，由超导团簇的分数变化主导。1/f噪声被分解为交叉区域中的洛伦兹谱，其中单个波动子的作用被增强，指向介观相分离。
Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl. We find evidence for percolative-type superconductivity in the spatially inhomogeneous coexistence region of antiferromagnetic insulating and superconducting states. When the superconducting transition is driven by a magnetic field, percolation seems to be dominated by instable superconducting clusters upon approaching T(c)(B) from above, before a "classical" type of percolation is resumed at low fields, dominated by the fractional change of superconducting clusters. The 1/f noise is resolved into Lorentzian spectra in the crossover region, where the action of an individual fluctuator is enhanced, pointing to a mesoscopic phase separation.