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Linear magnetoresistivity in layered semimetallic CaAl2Si2
D G Costa1,2, Rodrigo B Capaz1, R Falconi3
1Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ, 21941-972, Brazil.
Scientific Reports
|March 8, 2018
Summary
This study reveals linear magnetoresistivity (LMR) in CaAl2Si2 up to 100K, offering a new material for LMR research. The findings explore its classification within existing LMR models.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- Linear magnetoresistivity (LMR) is typically observed in specific conditions (low temperatures, high magnetic fields) according to the Abrikosov model.
- Recent discoveries show high LMR in materials deviating from these conditions, explained by classical (Parish-Littlewood) or quantum (small effective mass/low carriers) scenarios.
Purpose of the Study:
- To investigate the linear magnetoresistivity (LMR) in the diamagnetic, layered, compensated, semimetallic CaAl2Si2.
- To characterize the pressure-temperature (P-T) evolution of LMR in CaAl2Si2.
- To determine if CaAl2Si2 fits into the quantum Abrikosov or classical Parish-Littlewood LMR classifications.
Main Methods:
- Systematic characterization of baric and thermal evolution of LMR.
- First-principles electronic structure calculations using density functional theory (DFT).
- Construction of a P-T phase diagram based on observed transition/crossover events.
Main Results:
- CaAl2Si2 exhibits robust, moderate LMR up to approximately 100K.
- Strong correlations were found among the main parameters influencing LMR.
- Various transition and crossover events were identified, leading to the construction of a P-T phase diagram.
Conclusions:
- CaAl2Si2 presents a novel system for studying LMR under less extreme conditions than previously thought.
- The study provides insights into the underlying physics of LMR in this material.
- Further discussion is needed to definitively classify CaAl2Si2 within existing LMR models.
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