In-situ local imaging of ferromagnetism and superconductivity in RbEuFe$_4$As$_4$

Huiyuan Man; Yusuke Iguchi; Jin-Ke Bao; Duck Young Chung; Mercouri G. Kanatzidis

doi:10.1021/acs.nanolett.4c02475

paper

In-situ local imaging of ferromagnetism and superconductivity in RbEuFe $_{4}$ As $_{4}$

arXiv:2407.11332 · doi:10.1021/acs.nanolett.4c02475

Abstract

The coexistence of superconductivity and ferromagnetism is an intrinsically interesting research focus in condensed matter physics but the study is limited by low superconducting ( $T_{c}$ ) and magnetic ( $T_{m}$ ) transition temperatures in related materials. Here, we used a scanning superconducting quantum interference device to image the in-situ diamagnetic and ferromagnetic responses of RbEuFe $_{4}$ As $_{4}$ with high $T_{c}$ and $T_{m}$ . We observed significant suppression of superfluid density in vicinity of the magnetic phase transition, signifying fluctuation-enhanced magnetic scatterings between Eu spins and Fe 3 $d$ conduction electrons. Intriguingly, we observed multiple ferromagnetic domains which should be absent in an ideal magnetic helical phase. The formation of these domains demonstrates a weak $c$ -axis ferromagnetic component probably arising from Eu spin-canting effect, indicative of possible superconductivity-driven domain Meissner and domain vortex-antivortex phases as revealed in EuFe $_{2}$ (As $_{0.79}$ P $_{0.21}$ ) $_{2}$ . Our observations highlight RbEuFe $_{4}$ As $_{4}$ is a unique system which includes multiple interplay channels between superconductivity and ferromagnetism.

arXiv comment11 pages, 5 figures

In-situ local imaging of ferromagnetism and superconductivity in RbEuFe4​As4​

Abstract

References in corpus (26)

In-situ local imaging of ferromagnetism and superconductivity in RbEuFe $_{4}$ As $_{4}$