How the insulator and pseudogap states coalesce beneath the superconductor dome

Author:

Martinez Alvarez Victor M.12,Cabo-Bizet Alejandro3,Cabo Montes de Oca Alejandro1

Affiliation:

1. Departamento de Física Teórica, Instituto de Cibernética, Matemática y Física, Calle E, No. 309, Vedado, La Habana, Cuba

2. Departamento de Fisica da Universidade Federal de Pernambuco, Av. Professor Luiz Freire, s/n, Cidade Universitria, Recife, Pernambuco, Brazil

3. Departamento de Física, Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear, Calle 30, No. 502 e/5ta y 7ma Avenidas, Playa, Ciudad Habana, Cuba

Abstract

The pseudogap effects and the expected quantum phase transitions (QPTs) in cuprate materials are yet unclear in nature. A single band tight-binding (TB) model for the CuO 2 planes of these materials had predicted the existence of definite pseudogap states at half-filling, after considering that a crystal symmetry breaking and noncollinear spin orientations of the single particle states are allowed. Here we show that after including hole doping in the model, a QPT which lies beneath the superconducting dome exists and is a second-order one. In it, an antiferromagntic-insulator (AFI) ground state, showing strong spin fluctuations at low doping, coalesce with an excited paramagnetic pseudogap (PPG) state, exhibiting a broken lattice symmetry at the critical hole density. A critical doping value xc = 0.2 resulted, which surprisingly coincided with the experimentally measured one, in spite of the fact that the model parameters were not yet optimized. Above this value the system becomes a paramagnetic metal. The band structures and Fermi surface with doping are evaluated and their evolution show a close resemblance with the experimental observations, including the topological change in structure at the critical hole density.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3