Effect of the pseudogap on the infrared response in cuprate superconductors

Effect of the pseudogap on the infrared response in cuprate superconductors
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赝能隙对铜酸盐超导体红外响应的影响

DOI:
10.1080/09500839.2014.916424
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发表时间:
2014-03
影响因子:
1.2
通讯作者:
Feng, Shiping
Feng, Shiping
中科院分区:
材料科学4区
文献类型:
--
作者:
Qin, Ling;Qin, Jihong;Feng, Shiping

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铜氧化物超导体的一个最基本的方面是一个大的赝能隙与超导能隙共存,那么一些反常的性质可以从赝能隙的形成来理解。在动能驱动的超导机制下,研究了赝能隙对铜氧化物超导体超导态红外响应的影响。通过考虑超导能隙和赝能隙的相互作用,利用线性响应方法求出了电子电流-电流关联函数,并将其用于有限频率电导率的计算。结果表明,在欠掺杂和最佳掺杂制度,转移的部分低能量的光谱重量的电导率谱到较高的能量区域,以形成一个中红外波段本质上与赝能隙的存在。
One of the most essential aspects of cuprate superconductors is a large pseudogap coexisting with a superconducting gap, then some anomalous properties can be understood in terms of the formation of the pseudogap. Within the kinetic energy-driven superconducting mechanism, the effect of the pseudogap on the infrared response of cuprate superconductors in the superconducting state is studied. By considering the interplay between the superconducting gap and pseudogap, the electron current–current correlation function is evaluated based on the linear response approach and it then is employed to calculate finite-frequency conductivity. It is shown that in the underdoped and optimally doped regimes, the transfer of the part of the low-energy spectral weight of the conductivity spectrum to the higher energy region to form a midinfrared band is intrinsically associated with the presence of the pseudogap.
DOI: 10.1103/physrevb.42.8736
发表时间: 1990-11
期刊: Physical review. B, Condensed matter
影响因子: --
作者:
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