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Linear magnetoresistivity in layered semimetallic CaAl 2 Si 2

Linear magnetoresistivity in layered semimetallic CaAl 2 Si 2

D G Costa, Rodrigo B Capaz, R Falconi, S Strikos, M ElMassalami

Sci Rep. 2018 Mar 6;8(1):4102.

PMID: 29511201

Abstract:

According to an earlier Abrikosov model, a positive, nonsaturating, linear magnetoresistivity (LMR) is expected in clean, low-carrier-density metals when measured at very low temperatures and under very high magnetic fields. Recently, a vast class of materials were shown to exhibit extraordinary high LMR but at conditions that deviate sharply from the above-mentioned Abrikosov-type conditions. Such deviations are often considered within either classical Parish-Littlewood scenario of random-conductivity network or within a quantum scenario of small-effective mass or low carriers at tiny pockets neighboring the Fermi surface. This work reports on a manifestation of novel example of a robust, but moderate, LMR up to ∼100 K in the diamagnetic, layered, compensated, semimetallic CaAl2Si2. We carried out extensive and systematic characterization of baric and thermal evolution of LMR together with first-principles electronic structure calculations based on density functional theory. Our analyses revealed strong correlations among the main parameters of LMR and, in addition, a presence of various transition/crossover events based on which a P - T phase diagram was constructed. We discuss whether CaAl2Si2 can be classified as a quantum Abrikosov or classical Parish-Littlewood LMR system.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP380537359	SI-2		380537-35-9	Price

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