Journal Article

PUBDB-2025-01489

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tunable Dirac nodal line in orthorhombic RuO$_2$

Uykur, E. (Corresponding author)Extern* ; Janson, O.Extern* ; Ginga, V. A. ; Schmidt, M. ; Giordano, N.DESY* ; Tsirlin, A. A.Extern*

2025
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.111.134114  doi:10.3204/PUBDB-2025-01489

Abstract: The pressure evolution of RuO$_2$ is studied using single-crystal x-ray diffraction in a diamond anvil cell, combined with ab initio band-structure calculations. The tetragonal rutile structure transforms into the orthorhombic CaCl$_2$-type structure above 13 GPa under quasihydrostatic pressure conditions. This second-order transition is ferroelastic in nature and accompanied by tilts of the RuO$_6$ octahedra. Orthorhombic RuO$_2$ is expected to be a paramagnetic metal, similar to ambient-pressure RuO$_2$2. It shows the increased 𝑡$_2𝑔$−𝑒$_𝑔$ 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.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Dresden-Rossendorf e. V. (HZDR)
3. Universität Leipzig (ITP)
4. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20230876 (I-20230876) (I-20230876)
4. DFG project G:(GEPRIS)247310070 - SFB 1143: Korrelierter Magnetismus: Von Frustration zu Topologie (247310070) (247310070)
5. DFG project G:(GEPRIS)492547816 - TRR 360: Eingeschränkte Quantenmaterie (492547816) (492547816)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2025

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