Nature of the high-pressure insulating state in Sr2IrO4 : Mott picture

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy Physical Review B Pub Date : 2025-03-04 DOI:10.1103/physrevb.111.l121101

Guoren Zhang, Hanif Hadipour, Eva Pavarini

{"title":"Nature of the high-pressure insulating state in Sr2IrO4 : Mott picture","authors":"Guoren Zhang, Hanif Hadipour, Eva Pavarini","doi":"10.1103/physrevb.111.l121101","DOIUrl":null,"url":null,"abstract":"At ambient pressure, the t</a:mi>2</a:mn>g</a:mi></a:mrow>5</a:mn></a:msubsup></a:math> layered perovskite <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msub><b:mrow><b:mi>Sr</b:mi></b:mrow><b:mn>2</b:mn></b:msub><b:msub><b:mrow><b:mi>IrO</b:mi></b:mrow><b:mn>4</b:mn></b:msub></b:math> is a correlated small-gap insulator. In the Mott picture, applying uniform pressure should therefore quickly close the gap; experimentally, however, the insulating state persists even under extreme pressures, suggesting that a mechanism other than Mott is at work. Yet, given the complexity of the system, it is unclear to what extent the Mott picture can be really excluded. Here, we thus reexamine the problem. We show that, surprisingly, the pressure-induced enhancement of the screened Coulomb interaction—combined with lattice distortions and spin-orbit driven <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msub><c:mi>j</c:mi><c:mi>eff</c:mi></c:msub><c:mo>=</c:mo><c:mn>1</c:mn><c:mo>/</c:mo><c:mn>2</c:mn></c:mrow></c:math> orbital ordering—can hold the system close to the metal-insulator transition up to very high pressure. Published by the American Physical Society 2025 ","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"40 1","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review B","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevb.111.l121101","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}

引用次数: 0

Abstract

At ambient pressure, the t2g5 layered perovskite Sr2IrO4 is a correlated small-gap insulator. In the Mott picture, applying uniform pressure should therefore quickly close the gap; experimentally, however, the insulating state persists even under extreme pressures, suggesting that a mechanism other than Mott is at work. Yet, given the complexity of the system, it is unclear to what extent the Mott picture can be really excluded. Here, we thus reexamine the problem. We show that, surprisingly, the pressure-induced enhancement of the screened Coulomb interaction—combined with lattice distortions and spin-orbit driven jeff=1/2 orbital ordering—can hold the system close to the metal-insulator transition up to very high pressure.

Published by the American Physical Society

2025

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

求助全文

约1分钟内获得全文去求助

来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter