Half-semimetals,characterized by their spin-polarized electronic states,hold significant promise for spintronic applications but remain scarce due to stringent electronic and magnetic criteria.Through a combination of...Half-semimetals,characterized by their spin-polarized electronic states,hold significant promise for spintronic applications but remain scarce due to stringent electronic and magnetic criteria.Through a combination of transport measurements and optical spectroscopy,we investigated the intermetallic compound Mn_(4)Al_(11),which features an exceptionally low carrier concentration and undergoes a magnetic phase transition near 68 K.Transport measurements reveal anomalies that deviate from typical metallic behavior at low temperatures.Optical spectroscopy indicates a small,nearly frequency-independent optical conductivity in the far-infrared region,with spectral weight decreasing as the temperature drops from 300 K to 50 K.These behaviors suggest a temperaturedependent carrier density and significant scattering of charge carriers.Combining experimental findings with calculated electronic band structures,we propose that Mn_(4)Al_(11) is a novel half-semimetal candidate exhibiting a ferrimagnetic ground state.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.12274033 and 12488201)the National Key Research and Development Program of China(Grant Nos.2022YFA1403901 and 2024YFA1408700)。
文摘Half-semimetals,characterized by their spin-polarized electronic states,hold significant promise for spintronic applications but remain scarce due to stringent electronic and magnetic criteria.Through a combination of transport measurements and optical spectroscopy,we investigated the intermetallic compound Mn_(4)Al_(11),which features an exceptionally low carrier concentration and undergoes a magnetic phase transition near 68 K.Transport measurements reveal anomalies that deviate from typical metallic behavior at low temperatures.Optical spectroscopy indicates a small,nearly frequency-independent optical conductivity in the far-infrared region,with spectral weight decreasing as the temperature drops from 300 K to 50 K.These behaviors suggest a temperaturedependent carrier density and significant scattering of charge carriers.Combining experimental findings with calculated electronic band structures,we propose that Mn_(4)Al_(11) is a novel half-semimetal candidate exhibiting a ferrimagnetic ground state.
