Fig. 4. FM quasi-atomic IAEs in [Gd₂C]²⁺·2e⁻ electride.

a Schematic illustration of the crystal structure of Gd₂CCl containing Cl atoms substituted for IAEs. b Rietveld refinement of powder XRD patterns for Gd₂CCl. c Temperature (T) dependence of magnetization (M) for polycrystalline [Gd₂C]²⁺·2e⁻ electride (black) and Gd₂CCl (pink) under a magnetic field of 0.1 T. Each arrow indicates the T_C (350 K, black) and T_N (30 K, pink). The inset is the M–H curve for both samples at 2 K. d Magnetic phase diagram for [Gd₂C]²⁺·(1−x)2e⁻·Cl_x (bottom scale) and [Gd₂C]²⁺·y□·(2−y)e⁻ (top scale). e, f ELF for spin-up (e) and spin-down (f) states for Gd₂CCl. g, h CED map (−1.0 eV < E < 0 eV) (g) and MDM (h) for Gd₂CCl.