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首页> 外文会议>Conference on High Temperature Superconductivity Coral Gables, Florida January 7-13 1999 >Low-energy electronic structure in Y_(1-x)Ca_xBa_2Cu_3O_(7- delta ) : comparison of time-resolved optical spectroscopy, NMR, neutron and tunneling data
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Low-energy electronic structure in Y_(1-x)Ca_xBa_2Cu_3O_(7- delta ) : comparison of time-resolved optical spectroscopy, NMR, neutron and tunneling data

机译：Y_（1-x）Ca_xBa_2Cu_3O_（7- delta）中的低能电子结构：时间分辨光谱，NMR，中子和隧穿数据的比较

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摘要

Time-resolved optical measurements give information on the quasiparticle relaxation dynamics in YBCO, from which the evolution of the gap with doping and temperature can be systematically deduced. In this paper these optical charge-channel ''pseudogap'' data are compared with the ''pseudogap'' obtained from the NMR Knight shift K_s, spin polarized neutron scattering (SPNS) and single particle tunneling measurements. A simple energy level diagram is propsoed to explain the different ''gap'' magnitudes observed by different spectroscopies in YBa_2Cu_3O_(7- delta ), whereby the spin gap DELTA _s in NMR and SPNS corresponds to a triplet local pair state, while DELTA _p in the charge excitation spectrum corresponds to the pair dissociation energy. At optimum doping and in the overdoped state, an additional T-dependent gap becomes evident, which closes at T_c, suggesting a cross-over to a more conventional BCS-luke supercon-ductivity scenario.
机译：时间分辨的光学测量提供了有关YBCO中准粒子弛豫动力学的信息，从中可以系统地推断出间隙随掺杂和温度的变化。在本文中，将这些光学电荷通道“ pseudogap”数据与通过NMR奈特位移K_s，自旋极化中子散射（SPNS）和单粒子隧穿测量获得的“ pseudogap”数据进行了比较。提出了一个简单的能级图来解释在YBa_2Cu_3O_（7- delta）中不同光谱学观察到的不同“间隙”幅度，其中NMR和SPNS中的自旋间隙DELTA _s对应于三重态局部对态，而DELTA _p电荷激发光谱中的α对应于对解离能。在最佳掺杂和过量掺杂状态下，会出现一个额外的T依赖间隙，该间隙在T_c处闭合，这暗示了与更常规的BCS-luke超导情况的交叉。

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