Ferromagnetic ordering and half-metallic state of Sn2Co3S2with the shandite-type structure

Abstract

Single crystalline Sn 2 Co 3 S 2 with the shandite-type structure was investigated by magnetization, magnetoresistance, Hall effect, and heat capacity measurements and by 119 Sn Mößbauer spectroscopy. Sn 2 Co 3 S 2 orders ferromagnetically at 172 K with an easy-axis magnetization of ≈1 μ B along the hexagonal c axis. The half-metallic ferromagnetic state is investigated by detailed band-structure calculations by density functional theory (DFT) methods. The magnetoresistance and the Hall effect as well as the DFT results show that ferromagnetic Sn 2 Co 3 S 2 is a compensated metal. The 119 Sn Mößbauer spectroscopic data confirm these findings. Large transferred hyperfine fields B hf up to 34.2 T are observed.

Single crystal growth and characterization of kagomé-lattice shandites Co3Sn2−In S2

“…The Curie temperature, T C , and spontaneous moment, m s , in the easy c-axis at 2 K of Co 3 Sn 2 S 2 are found to be 174 K and 0.26 m B /Co, respectively, as estimated by the Arrott plot of magnetic isotherms (not shown). The obtained T C and m s coincide well the recently reported results using single crystals [15,20]. With increasing of the In concentration, the ferromagnetic order is suppressed and collapsed around x c $ 0.8.…”

“…Theoretical band-structure calculations and photoemission study indicated a half metalicity of the ferromagnetic state of Co 3 Sn 2 S 2 [9,15,17] which is classified as a type I A half-metallic ferromagnet [18]. The counterpart Co 3 In 2 S 2 was predicted as a paramagnetic metal by recent theoretical band calculations [19], which implies the ferromagnetic quantum phase transition by the In-substitution for Sn in Co 3 Sn 2 À x In x S 2 series.…”

“…The pure Sn compound, Co 3 Sn 2 S 2 , shows metallic transport properties and ferromagnetic order below 177 K with spontaneous and effective magnetic moments of $ 0.3 m B /Co and 0.57 m B /Co, respectively [9,15,16]. Theoretical band-structure calculations and photoemission study indicated a half metalicity of the ferromagnetic state of Co 3 Sn 2 S 2 [9,15,17] which is classified as a type I A half-metallic ferromagnet [18].…”

“…It is necessary to synthesize single crystalline samples for investigations on the anisotropic properties of this system. Recently, single crystals of the pure Sn compound, Co 3 Sn 2 S 2 , were synthesized from solution by means of the Sn self flux method [20] and further from melt by means of the Bridgman technique [15] and highly anisotropic magnetic properties below T C were reported. On the other hand, all the previously reported experiments of the In-substituted compounds were performed using polycrystalline samples.…”

Low-field anomalous magnetic phase in the kagome-lattice shandite Co3Sn2S2

“…1. Previous studies of the magnetization process of the half metallic ferromagnet Co 3 Sn 2 S 2 26,27 have explored high axial anisotropy in temperature and field dependences of the magnetization 28,29 . The Curie temperature, T C , and the spontaneous moment, M s , at 2 K in the easy c-axis were reported as 174 K and ~0.3 µ B /Co, respectively.…”