Time-Resolved Photoresponse Measurements of the Electrical Conductivity of the Quasi-Two-Dimensional Organic Superconductor β-(BEDT-TTF)2I3 Using a Nanosecond Laser Pulse
Time-Resolved Photoresponse Measurements of the Electrical Conductivity of the Quasi-Two-Dimensional Organic Superconductor β-(BEDT-TTF)2I3 Using a Nanosecond Laser Pulse
复制标题
DOI：
10.1021/jp2088912
复制
发表时间：
2011-11
影响因子：
3.7
通讯作者：
Toshifumi Iimori;F. Sabeth;T. Naito;N. Ohta
中科院分区：
文献类型：
--
作者：
Toshifumi Iimori;F. Sabeth;T. Naito;N. Ohta
用纳秒激光脉冲激发，测量了准二维有机超导体β-（BEDT-TTF）_2I_3 [BEDT-TTF = bis（ethylenedithio）tetrathiafulvalene]的时间分辨电阻光响应。在所有温度下，光照射都会引起电阻的瞬时增加，但在接近高Tc相变温度的温度下，观察到衰减时间显着的温度依赖性;随着温度的降低，两种化合物的衰减速率变得更快，然后变得恒定。跨越高Tc相变温度。的光响应强度的温度依赖性是不同的，从测热效应的预期，表明存在的nonbolometric光响应。解释电导率光响应的一个可能机制是…
Time-resolved photoresponses in resistance have been measured following the nanosecond laser pulse excitation for the quasi-two-dimensional organic superconductors of hydrogenated and deuterated β-(BEDT-TTF)2I3 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene], which show two different superconducting states with high-Tc and low-Tc, at temperatures near the critical temperatures. A transient increase of the resistance is induced by photoirradiation at all the temperatures, but a marked temperature dependence of the decay time is observed at temperatures close to the high-Tc phase transition temperature; the decay rate becomes faster and then becomes constant in both compounds, as the temperature decreases across the high-Tc phase transition temperature. The temperature dependence of the photoresponse intensity is different from the one expected from the bolometric effects, indicating the presence of the nonbolometric photoresponse. A possible mechanism explaining the photoresponse of the conductivity is ...