A symmetry-breaking design in triangulene-based 2D organic frameworks produces metal-free altermagnetism with d-wave spin splitting of 17 meV, enhanced to 27 meV under strain.
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Magnetization, transport, and muon spin relaxation measurements provide evidence for altermagnetic order in Fe0.85Cr0.15Sb2 below ~3.5 K with time-reversal symmetry breaking but no net magnetization.
Altermagnets exhibit a resonant third-order intrinsic anomalous Hall effect from the Berry curvature quadrupole, serving as a quantum geometric transport fingerprint.
Altermagnets enable planar Josephson junctions that host Majorana end modes controlled by crystallographic orientation, extending naturally to high-Tc platforms.
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Topological altermagnetic Josephson junctions
Altermagnets enable planar Josephson junctions that host Majorana end modes controlled by crystallographic orientation, extending naturally to high-Tc platforms.