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Observation of Giant Spin Splitting and d-wave Spin Texture in Room Temperature Altermagnet RuO2
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Recently, a novel magnetic phase called altermagnetism has been proposed, ushering in a third distinct magnetic phase beyond ferromagnetism and antiferromagnetism. It is expected that this groundbreaking phase exhibits unique physical properties such as C-paired spin-valley locking, anomalous Hall effect, nontrivial Berry phase, and giant magnetoresistance, etc. Among all the predicted candidates, several room temperature altermagnets are suggested to host significant potential applications in the near future. Nevertheless, direct evidence about the spin pattern of the room temperature altermagnet is still unrevealed. Previous studies found that RuO2 is identified as the most promising candidate for room temperature d-wave altermagnetism, exhibiting a substantial spin splitting of up to 1.4 eV. In this study, utilizing angle-resolved photoemission spectroscopy (ARPES), we report experimental observation of the spin splitting in RuO2. Furthermore, employing spin-ARPES, we directly observed the d-wave spin pattern. Our results unequivocally show that RuO2 is a perfect d-wave altermagnet with great potential for upcoming spintronic applications.
Forward citations
Cited by 5 Pith papers
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Orbital-Selective Mott Transition and Correlation-Amplified Charge Ordering in the Altermagnet CsCr$_2$S$_2$O
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Effect of applied pressure on the non-relativistic spin-splitting (NRSS) of FeSb2 altermagnet: A first-principles study
DFT calculations predict FeSb2 remains dynamically stable up to 10 GPa, with pressure suppressing its altermagnetic spin splitting and reversing the sign of its anomalous Hall conductivity.
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Symmetry, microscopy and spectroscopy signatures of altermagnetism
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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