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Altermagnetic Polar Metallic phase in Ultra-Thin Epitaxially-Strained RuO2 Films

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arxiv 2405.05838 v2 pith:SSALSAO6 submitted 2024-05-09 cond-mat.mtrl-sci cond-mat.other

Seung Gyo Jeong , In Hyeok Choi , Sreejith Nair , Luca Buiarelli , Bita Pourbahari , Jin Young Oh , Nabil Bassim , Daigorou Hirai
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Ambrose Seo Woo Seok Choi Rafael M. Fernandes Turan Birol Liuyan Zhao Jong Seok Lee Bharat Jalan
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classification cond-mat.mtrl-scicond-mat.other
keywords phasealtermagneticfilmsmagneticruo2altermagnetismepitaxially-strainedmetallic
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Altermagnetism refers to a wide class of magnetic orders featuring magnetic sublattices with opposite spins related by rotational symmetries, resulting in non-trivial spin splitting and magnetic multipoles. However, the direct observation of the altermagnetic order parameter remains elusive. Here, by combining theoretical analysis, electrical transport, X-ray and optical spectroscopies, we establish a phase diagram in hybrid molecular beam epitaxy-grown RuO2/TiO2 (110) films, mapping symmetries along with altermagnetic/electronic/structural phase transitions as functions of film thickness and temperature. This features a novel altermagnetic metallic polar phase in epitaxially-strained 2 nm films, extending the concept of multiferroicity to altermagnets. Such a clear signature of a magnetic phase transition at ~500 K is observed exclusively in ultrathin strained films, unlike in bulk RuO2 single crystals. These results demonstrate the potential of epitaxial heterostructure design to induce altermagnetism, paving the way for emergent novel phases with multifunctional properties.

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Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Strain-Stabilized Interfacial Polarization Tunes Work Function Over 1 eV in RuO2/TiO2 Heterostructures

    cond-mat.mtrl-sci 2025-07 conditional novelty 7.0 of 10

    Interfacial polarization in metallic RuO2/TiO2 is directly imaged and linked to a work function change exceeding 1 eV at a critical thickness of about 4 nm.

  2. Metallicity and Anomalous Hall Effect in Epitaxially-Strained, Atomically-thin RuO2 Films

    cond-mat.mtrl-sci 2025-01 conditional novelty 7.0 of 10

    Ultrathin strained RuO2 films stay metallic and show an anomalous Hall effect below 9 tesla, linked by DFT to a strain-stabilized non-compensated magnetic state.

  3. Spin-Splitting Magnetoresistance in Altermagnetic RuO2 Thin Films

    cond-mat.mes-hall 2024-12 conditional novelty 7.0 of 10

    A phase-shifted magnetoresistance in (101)-RuO2/Co bilayers is attributed to spin-splitting magnetoresistance, indicating altermagnetism with a Néel vector near [001] in epitaxial RuO2 thin films.

  4. Strain-Driven Altermagnetic Spin Splitting Effect in RuO$_2$

    cond-mat.mtrl-sci 2026-02 conditional novelty 6.0 of 10

    Strained (100) and (110) RuO2 films are predicted to show altermagnetic spin splitting and a strong spin Hall effect at U=0, while bulk and (001)/(101) films remain nonmagnetic.

  5. Moir\'e-resonant surface state in ultrathin RuO$_2$

    cond-mat.mtrl-sci 2025-07 conditional novelty 6.0 of 10

    Ultrathin RuO2(110) on Ru(0001) shows a nonmagnetic moiré charge modulation enhanced by Fermi surface nesting, with no sign of surface magnetism.

  6. Anisotropic Strain Relaxation-Induced Directional Ultrafast Carrier Dynamics in RuO2 Films

    cond-mat.mtrl-sci 2025-02 conditional novelty 6.0 of 10

    Anisotropic strain relaxation in thin RuO2 films creates direction-dependent hot-carrier relaxation, attributed to strain-tuned band nesting.

  7. Effects of altermagnetic order, strain and doping in RuO$_2$

    cond-mat.mtrl-sci 2025-02 conditional novelty 6.0 of 10

    Optical reflectance, ellipsometry, and Raman data plus DFT indicate bulk RuO2 is best described as nonmagnetic, with altermagnetic order only potentially stabilized by specific epitaxial strain.

  8. Hallmarks of spin textures for high-harmonic generation in two-dimensional materials

    cond-mat.str-el 2025-01 conditional novelty 6.0 of 10

    Even-order high-harmonic emission in non-centrosymmetric 2D materials is shown to require a broken twofold rotational symmetry of the spin texture, plus nonzero Berry curvature when time-reversal symmetry is preserved.

  9. Universal Scaling Behavior of Transport Properties in Non-Magnetic RuO$_{2}$

    cond-mat.mtrl-sci 2024-12 conditional novelty 5.0 of 10

    High-quality RuO2 crystals show no magnetic transition and no crystal Hall effect, and their transport matches nonmagnetic band-structure simulations, indicating RuO2 is a semimetal, not an altermagnet.

  10. Symmetry, microscopy and spectroscopy signatures of altermagnetism

    cond-mat.mtrl-sci 2025-06 unverdicted

    A review of the symmetry, microscopic origin, and detection of altermagnetism, a collinear magnetic phase with alternating spin polarization in momentum space.

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