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.
Highlights
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
In this work we present a novel example of a robust LMR in diamagnetic CaAl2Si2 which, modest, manifests interesting features which cannot be straightforwardly classified as being driven by either a classic or a quantum mechanism
In order to form a clear and consistent picture of LMR in CaAl2Si2 as well as to clarify the above-mentioned discrepancies, we systematically investigated thermal and baric evolution of LMR and perform extensive first-principles electronic structure calculations based on density functional theory (DFT)
Summary
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. 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 randomconductivity network or within a quantum scenario of small-effective mass or low carriers at tiny pockets neighboring the Fermi surface. 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. In order to form a clear and consistent picture of LMR in CaAl2Si2 as well as to clarify the above-mentioned (quantum and classical) discrepancies, we systematically investigated thermal and baric evolution of LMR and perform extensive first-principles electronic structure calculations based on density functional theory (DFT)
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