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

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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

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Sr2IrO4中高压绝缘状态的性质：莫特图

在环境压力下，t2g5层状钙钛矿Sr2IrO4是一个相关的小间隙绝缘体。在莫特的图中，施加均匀的压力应该会迅速缩小间隙；然而，在实验中，即使在极端压力下，绝缘状态仍然存在，这表明除了莫特之外的另一种机制在起作用。然而，考虑到系统的复杂性，目前尚不清楚在多大程度上可以真正排除莫特的情况。在这里，我们就这样重新审视这个问题。我们发现，令人惊讶的是，压力诱导的屏蔽库仑相互作用的增强-结合晶格畸变和自旋轨道驱动的jeff=1/2轨道有序-可以使系统在非常高的压力下接近金属-绝缘体转变。2025年由美国物理学会出版

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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