Evidence for the complicated Fermi surface in 2H- and 4H-NbSe$_2$

Bulletin of Materials Science

关键词: Transition metal compound;    low-field transport;    magneto-resistance.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

In this study, we have found superconducting state (SC) at 7.4 and 6.4 K and charge density wave state (CDW) at 35 and 42 K in our 2H- and 4H-NbSe$_2$single crystals, respectively. Besides this, there exists a positive magneto-resistance (MR) below the CDWtransition temperature on both the crystals. Therefore, we have calculated their fractional change in MR i.e., $\Delta \rho/\rho_0$ around 8 K in $H_{\perp}$ plane of NbSe$_2$ and $H_{\parallel}$ plane of NbSe$_2$ configurations. Both single crystals show anisotropic $\Delta \rho/\rho_0$, which are described by Kohler’s rule, two-band model and magnetic breakdown model. In the present scenario, the magnetic breakdown model explains our anisotropic $\Delta \rho/\rho_0$ better than other two models: Kohler’s and two-band model. This model also established the presence of complicated Fermi surface on both single crystals.

【 授权许可】

CC BY