Fig. 2: Coexistence of superconductivity and ferromagnetism in lithium intercalated FeSe.
From: Lithium intercalated FeSe as a high-temperature superconducting ferromagnet
a Temperature dependent resistance measured from different pairs of contacts on sample S2 after lithium intercalation. Inset is an optical image of sample S2, taken before capping with h-BN. Upper indices of \({R}_{{xx}}\) or \({R}_{{xy}}\) correspond to the contacts shown in the inset. b Hall resistance as a function of perpendicular magnetic field measured at a set of temperature points. Curves are vertically offset (dashed lines indicate zero Hall resistances). Black arrows indicate the definition of the anomalous Hall resistance \({R}_{{AH}}\). c Longitudinal resistance as a function of perpendicular magnetic field at a set of temperature points. Arrows denote the sweeping directions. d Temperature dependence of \({R}_{{AH}}\) (circles) and the Hall carrier density (diamonds). e Susceptometry images measured at a set of temperature points on sample S3. Dashed curves delineate the sample boundary. f Temperature dependence of the maximum diamagnetic strength (circles) and sample resistance (solid curve) at zero field. g Magnetometry images measured at a set of temperature points. Dashed curves delineate the sample boundary. h Temperature dependent magnetic contrast \(\Delta \varPhi={\varPhi }_{\max }-{\varPhi }_{\min }\). \({\varPhi }_{\max }\) and \({\varPhi }_{\min }\) are the maximum and minimum magnetic flux values in the scanned area, respectively.
