Coexistence of superconductivity and antiferromagentic order in Er2O2Bi with anti-ThCr2Si2 structure

Interplay between Charge-Density-Wave, Superconductivity, and Ferromagnetism in CuIr2–xCrxTe4 Chalcogenides

“…In particular, the discovery of magnetic superconductors has been raised a fascinating issue concerning the origin of SC. − A fascinating class of strongly correlated materials is the unconventional superconductors, which includes the materials with the range of superconducting critical temperature T sc , from organic and heavy-Fermion superconductors with relatively low T sc to iron pnictides and cuprates that can record T sc > 100 K. − Generally, in strongly correlated electron systems, SC appears around phase boundaries of magnetic phases by chemical doping or adding physical pressure. However, only a few compounds are found coexistence of SC and FM or AFM ordering, such as UMGe (M = Rh, Co), , Sm 1– x R x NiC 2 (R = La, Lu), EuFe 2 (As 1– x P x ) 2 , Fe 1– x Pd x Te, Ce 3 PdIn 11 , Er 2 O 2 Bi, (Li 0.8 Fe 0.2 )­OHFeSe, etc. A crucial matter that could be clarified is experimentally finding the relationship between SC and magnetism.…”

Superconductivity and improved electrical conduction in anti-ThCr2Si2-type RE2O2Sb and RE2O2Bi with pnictogen square net

“…Typically, RE 2 O 2 Bi exhibits antiferromagnetic ordering owing to the 4f electrons in the RE 2 O 2 layer. Consequently, conduction carriers in the Bi square net show unique magnetotransport behavior caused by the interaction between the conduction carriers and localized magnetic moments (Sei et al, 2020;Qiao et al, 2021aQiao et al, , 2021b. For example, Ce 2 O 2 Bi undergoes an antiferromagnetic transition at 6.2 K (Figure 2B).…”

“…From synchrotron X-ray diffraction (XRD) measurements of oxygen-intercalated La 2 O 2 Bi, the crystallographic position of the intercalated oxygen was located at the 4e site adjacent to the RE position (Figure 5C) (Matsumoto et al, 2020). Magnetization measurements at ultralow temperatures of Er 2 O 2 Bi showed both a superconducting transition at 1.23 K and an antiferromagnetic transition at 3 K, indicating the coexistence of superconductivity and magnetism (Qiao et al, 2021b). Further studies on the effects of tetragonality and magnetism on the superconductivity in RE 2 O 2 Bi are expected in the future.…”

Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi

“…The long-range ordered rareearth antiferromagnetism in the [R 2 O 2 ] 2+ layer naturally generates scientific interests on its relations with the superconductivity in the Bi layer. A very recent study on Er 2 O 2 Bi suggested that there may be a competition between superconductivity and antiferromagnetic order [36]. Therefore, this series of materials provide a new platform for investigating the interplay between antiferromagnetism and superconductivity.…”

“…Most interestingly, R 2 O 2 Bi with heavy rare-earth elements (R = Tb, Dy, Er, Lu, Y) were recently discovered to be superconducting below ∼2 K via excess oxygen incorporation [33][34][35]. Remarkably, Tb 2 O 2 Bi and Er 2 O 2 Bi are found to become antiferromagnetic in a first-ordered transition when they become superconductor, exhibiting the coexistence of antiferromagnetism with superconductivity according to the measurements of resistivity and susceptibility [27,[34][35][36].…”