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Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2

Thirupathaiah, S and Kushnirenko, Y and Haubold, E and Fedorov, AV and Rienks, EDL and Kim, TK and Yaresko, AN and Blum, CGF and Aswartham, S and Buechner, B and Borisenko, SV (2018) Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2. In: PHYSICAL REVIEW B, 97 (3).

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Official URL: http://dx.doi.org/10.1103/PhysRevB.97.035133

Abstract

The nonmagnetic compounds showing extremely large magnetoresistance are attracting a great deal of research interest due to their potential applications in the field of spintronics. PtBi2 is one of such interesting compounds showing large linear magnetoresistance (MR) in both the hexagonal and pyrite crystal structure. We use angle-resolved photoelectron spectroscopy and density functional theory calculations to understand the mechanism of liner MR observed in the layered PtBi2. Our results uncover linear dispersive surface Dirac states at the (Gamma) over bar point, crossing the Fermi level with a node at a binding energy of approximate to 900 meV, in addition to the previously reported Dirac states at the (K) over bar point in the same compound. We further notice from our dichroic measurements that these surface states show an asymmetric spectral intensity when measured with left and right circularly polarized light, hinting at a substantial spin polarization of the bands. Following these observations, we suggest that the linear dispersive Dirac states at the (Gamma) over bar and (K) over bar points are likely to play a crucial role for the linear field dependent magnetoresistance recorded in this compound.

Item Type: Journal Article
Additional Information: Copy right for this article belong to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 15:05
Last Modified: 23 Feb 2019 04:34
URI: http://eprints.iisc.ac.in/id/eprint/58916

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