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

Bulletin of materials science

I NAIK²  A K RASTOGI¹ 

[1] School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India$$School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, IndiaSchool of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India$$;Department of Physics, North Orissa University, Baripada 757003, India$$Department of Physics, North Orissa University, Baripada 757003, IndiaDepartment of Physics, North Orissa University, Baripada 757003, India$$

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

DOI  :  

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., $Delta ho/ho_0$ around 8 K in $H_{perp}$ plane of NbSe$_2$ and $H_{parallel}$ plane of NbSe$_2$ configurations. Both single crystals show anisotropic $Delta ho/ho_0$, 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 $Delta ho/ho_0$ 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】

Unknown