Fig. 3: Signature of the transition from Stoner-type to Heisenberg-type ferromagnetism in atomically thin Cr2Te3.
From: From Stoner to local moment magnetism in atomically thin Cr2Te3
a, b Fermi surface maps of 6 ML and 1 ML samples. The integrated energy window is ±20 mV around EF. c, d Temperature-dependent electronic structure evolution from ferromagnetic to paramagnetic state in 6 ML and 1 ML samples, respectively. Red and green dashed lines denote the Stoner exchange splitting bands in the 6 ML sample. Blue dashed lines indicate two separate bands in 1 ML sample. e Temperature-dependent energy shift in 6 ML and 1 ML samples. The red squares represent the energy separation of the two red dashed bands (c) at momentum k = 0.4 (1/Å). The blue squares represent the energy separation of the two blue dashed bands (d) at the Fermi momentum kF. The black solid line is the expected energy shift from the Stoner model. The error bars are uncertainties in determining the energy distance. f Temperature-dependent momentum shift in 6 ML and 1 ML samples. The green squares denote the momentum distance in panel c. The blue squares represent the momentum separation in panel d. The black solid line is the expected momentum shift from the Stoner model. The error bars are uncertainties in determining the momentum distance.
