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Large band-splitting in $g$-wave type altermagnet CrSb
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abstract
Altermagnetism (AM), a newly discovered magnetic state, ingeniously integrates the properties of ferromagnetism and antiferromagnetism, representing a significant breakthrough in the field of magnetic materials. Despite experimental verification of some typical AM materials, such as MnTe and MnTe$_2$, the pursuit of AM materials that feature larger spin splitting and higher transition temperature is still essential. Here, our research focuses on CrSb, which possesses N{\'e}el temperature of up to 700K and giant spin splitting near the Fermi level ($E_F$). Utilizing high-resolution angle-resolved photoemission spectroscopy and density functional theory calculations, we meticulously map the three-dimensional electronic structure of CrSb. Our photoemission spectroscopic results on both (0001) and (10$\overline{1}$0) cleavages of CrSb collaboratively reveal unprecedented details on AM-induced band splitting, and subsequently pin down its unique bulk $g$-wave symmetry through quantitative analysis of the angular and photon-energy dependence of spin splitting. Moreover, the observed spin splitting reaches the magnitude of 0.93~eV near $E_F$, the most substantial among all confirmed AM materials. This study not only validates the nature of CrSb as a prototype $g$-wave like AM material but also underscores its pivotal role in pioneering applications in spintronics.
Forward citations
Cited by 6 Pith papers
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Pair-Density Wave from Doping an Altermagnetic Mott Insulator
Doping an altermagnetic Mott insulator on the checkerboard t-J model yields a PDW coexisting with stripes under the reversed locking Q_PDW ≈ 2 Q_Stripe.
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Coulomb Drag in Altermagnets
Coulomb drag in altermagnetic bilayers is predicted to produce Hall drag and spin Hall drag without spin-orbit coupling, with orientation-dependent signatures of altermagnetism.
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Emergence and Detection of Surface altermagnetism in KV$_2$Se$_2$O
Bulk antiferromagnetic KV2Se2O is predicted to have d-wave altermagnetic surface states and a large surface nonlinear Edelstein effect that explains existing spin-splitting observations.
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N\'eel vector-dependent anomalous transport in altermagnetic metal CrSb
First-principles calculations predict that CrSb shows a Neel-vector-dependent anomalous Hall conductivity up to 72 S/cm and a room-temperature anomalous Nernst conductivity of -0.19 A/m/K, both maximal when the Neel v...
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Third-order and fifth-order nonlinear spin-current generation in $g$-wave and $i$-wave altermagnets, and perfectly nonreciprocal spin-current in $f$-wave magnets
In two-band models of higher-wave magnets, the only nonzero nonlinear spin Drude conductivity has order equal to one less than the number of Fermi-surface nodes.
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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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