Tunable Dirac nodal line in orthorhombic RuO2

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy Physical Review B Pub Date : 2025-04-24 DOI:10.1103/physrevb.111.134114

Ece Uykur, Oleg Janson, Victoria A. Ginga, Marcus Schmidt, Nico Giordano, Alexander A. Tsirlin

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Abstract

The pressure evolution of RuO2 is studied using single-crystal x-ray diffraction in a diamond anvil cell, combined with band-structure calculations. The tetragonal rutile structure transforms into the orthorhombic CaCl2-type structure above 13 GPa under quasihydrostatic pressure conditions. This second-order transition is ferroelastic in nature and accompanied by tilts of the RuO6 octahedra. Orthorhombic RuO2 is expected to be a paramagnetic metal, similar to ambient-pressure RuO2. It shows the increased t2g−eg crystal-field splitting that is responsible for the pressure-induced color change. It further features the Dirac nodal line that shifts across the Fermi level upon compression.

Published by the American Physical Society

2025

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正交RuO2中的可调谐狄拉克节点线

利用单晶x射线衍射，结合带结构计算，研究了金刚石砧池中RuO2的压力演化。在准静水压力条件下，方形金红石结构在13gpa以上转变为正交cacl2型结构。这种二阶跃迁本质上是铁弹性的，并且伴随着RuO6八面体的倾斜。正交RuO2预计是一种顺磁性金属，类似于常压RuO2。结果表明，t2g−eg晶体场分裂的增加是压力引起颜色变化的原因。它的进一步特点是狄拉克节点线在压缩时跨越费米能级。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