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】

Free