期刊
SCIENCE ADVANCES
卷 7, 期 52, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abl4432
关键词
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资金
- National Key Research and Development Program of China [2017YFA0302904, 2017YFA0302901, 2016YFA0300502]
- National Natural Science Foundation of China [11634015, 11674377, 11774306, 12034004]
- K. C. Wong Education Foundation [GJTD-201801]
- Youth Innovation Promotion Association of CAS [2018012]
- JSPS [JP19H00657]
K2Cr3As3 is a new type of spin-triplet superconductor with unique magnetic properties and superconducting behavior, making it a promising platform for the study of topological superconductivity and potential technological applications.
A spin-triplet superconductor can harbor Majorana bound states that can be used in topological quantum computing. Recently, K2Cr3As3 and its variants with critical temperature Tc as high as 8 kelvin have emerged as a new class of superconductors with ferromagnetic spin fluctuations. Here, we report a discovery in K2Cr3As3 single crystal that the spin susceptibility measured by As-75 Knight shift below T-c is unchanged with the magnetic field H-0 applied in the ab plane but vanishes toward zero temperature when H-0 is along the c axis, which unambiguously establishes this compound as a spin-triplet superconductor described by a vector order parameter (d) over right arrow parallel to the c axis. Combining with point nodal gap, we show that K2Cr3As3 is a new platform for the study of topological superconductivity and its possible technical application.
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