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Title: Quadratic to linear magnetoresistance tuning in TmB 4
Authors: Mitra, Sreemanta
Kang, Jeremy Goh Swee
Shin, John
Ng, Jin Quan
Sunku, Sai Swaroop
Kong, Tai
Canfield, Paul C.
Shastry, B. Sriram
Sengupta, Pinaki
Panagopoulos, Christos
Keywords: DRNTU::Science::Physics
Anisotropic Magnetoresistance
Issue Date: 2019
Source: Mitra, S., Kang, J. G. S., Shin, J., Ng, J. Q., Sunku, S. S., Kong, T., . . . Panagopoulos, C. (2019). Quadratic to linear magnetoresistance tuning in TmB4. Physical Review B, 99(4), 045119-. doi:10.1103/PhysRevB.99.045119
Series/Report no.: Physical Review B
Abstract: The change of a material's electrical resistance (R) in response to an external magnetic field (B) provides subtle information for the characterization of its electronic properties and has found applications in sensor and storage related technologies. In good metals, Boltzmann's theory predicts a quadratic growth in magnetoresistance (MR) at low B and saturation at high fields. On the other hand, a number of nonmagnetic materials with weak electronic correlation and low carrier concentration for metallicity, such as inhomogeneous conductors, semimetals, narrow gap semiconductors and topological insulators, and two dimensional electron gas, show positive, nonsaturating linear magnetoresistance (LMR). However, observation of LMR in single crystals of a good metal is rare. Here we present low-temperature, angle-dependent magnetotransport in single crystals of the antiferromagnetic metal, TmB4. We observe large, positive, and anisotropic MR(B), which can be tuned from quadratic to linear by changing the direction of the applied field. In view of the fact that isotropic, single crystalline metals with large Fermi surface (FS) are not expected to exhibit LMR, we attribute our observations to the anisotropic FS topology of TmB4. Furthermore, the linear MR is found to be temperature independent, suggestive of quantum mechanical origin.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.99.045119
Schools: School of Physical and Mathematical Sciences 
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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