In Situ Local Imaging of Ferromagnetism and Superconductivity in RbEuFe4As4

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

doi:10.1021/acs.nanolett.4c02475

In Situ Local Imaging of Ferromagnetism and Superconductivity in RbEuFe₄As₄

Journal Article · Mon Jul 15 00:00:00 EDT 2024 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.4c02475· OSTI ID:2446548

^[1]; ^[2]; ^[3]; Chung, Duck Young ^[3]; ^[4]

Stanford Univ., CA (United States); SLAC
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

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 RbEuFe₄As₄ 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 3d 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 EuFe₂(As_0.79P_0.21)₂. Finally, our observations highlight RbEuFe₄As₄ is a unique system which includes multiple interplay channels between superconductivity and ferromagnetism.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2446548

Alternate ID(s):: OSTI ID: 2478793

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 29 Vol. 24; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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