Topological magnetic order and superconductivity in EuRbFe4As4 | |
Article | |
关键词: ANGLE-RESOLVED PHOTOEMISSION; ELECTRON-SPIN RESONANCE; CRITICAL-FIELD; PHASE-DIAGRAM; FERMI-SURFACE; FERROMAGNETISM; DESTRUCTION; COEXISTENCE; SYMMETRY; LIFETIME; | |
DOI : 10.1103/PhysRevB.103.195112 | |
来源: SCIE |
【 摘 要 】
We study single crystals of the magnetic superconductor EuRbFe4As4 by magnetization, electron spin resonance (ESR), angle-resolved photoemission spectroscopy, and electrical resistance in pulsed magnetic fields up to 63 T. The superconducting state below 36.5 K is almost isotropic and is only weakly affected by the development of Eu2+ magnetic order at 15 K. On the other hand, for the external magnetic field applied along the c axis the temperature dependence of the ESR linewidth reveals a Berezinskii-Kosterlitz-Thouless topological transition below 15 K. This indicates that Eu2+ planes are a good realization of a two-dimensional XY magnet, which reflects the decoupling of the Eu2+ magnetic moments from superconducting FeAs layers.
【 授权许可】
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