Anomalous Pressure Dependence of the Charge Density Wave and Fermi Surface Reconstruction in BaFe<sub>2</sub>Al<sub>9</sub>

Anomalous Pressure Dependence of the Charge Density Wave and Fermi Surface Reconstruction in BaFe<sub>2</sub>Al<sub>9</sub>

<p dir="ltr">We investigate the pressure evolution of charge density wave (CDW) order in the intermetallic compound BaFe<sub>2</sub>Al<sub>9,</sub> which undergoes a pronounced first-order CDW transition ∼1 1 2 K at ambient pressure. High-pressure electrical r...

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Main Author: Mahmoud Abdel-Hafiez (1655398) (author)
Other Authors: Muthukumaran Sundaramoorthy (22119184) (author), Nabeel M. Jasim (23544625) (author), K. A. Irshad (23544628) (author), Chia Nung Kuo (23544631) (author), Chin Shan Lue (23544634) (author), F. L. Carstens (23544637) (author), A. Bertrand (11962946) (author), M. Mito (23544640) (author), Rüdiger Klingeler (2501800) (author), Vladislav Borisov (10232390) (author), Anna Delin (2297032) (author), Boby Joseph (3689131) (author), Olle Eriksson (181944) (author), Sonachalam Arumugam (1680910) (author), Govindaraj Lingannan (23544643) (author)
Published: 2025
Subjects:
Engineering
Electronics, sensors and digital hardware
Materials engineering
Physical sciences
Condensed matter physics
Charge density waves
Electric polarization
Pressure effects
Crystal structures
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Summary:<p dir="ltr">We investigate the pressure evolution of charge density wave (CDW) order in the intermetallic compound BaFe<sub>2</sub>Al<sub>9,</sub> which undergoes a pronounced first-order CDW transition ∼1 1 2 K at ambient pressure. High-pressure electrical resistivity and magnetization measurements reveal a systematic enhancement of the CDW transition temperature (T<sub>CDW</sub>) at a rate of ∼60 K / GPa, reaching 300 K under ∼3.2 GPa. The transition sharpness diminishes with pressure, indicating a crossover from first- to second-order behavior. Fermi liquid (FL) fits to the low-temperature resistivity reveal an increase in residual resistivity and a nonmonotonic evolution of the FL coefficient, indicating a pressure-induced Fermi surface (FS) reconstruction. Synchrotron x-ray diffraction reveals anisotropic lattice compression, a change in the compression trend of lattice parameters, and an abrupt change in microstrain at ∼3.6 GPa. Density functional theory calculations reveal pressure-induced flattening of quasi-two-dimensional FS sheets associated with the CDW nesting vector, consistent with enhanced nesting. These findings highlight the critical role of lattice strain and electronic structure evolution in stabilizing a high-temperature CDW phase, making BaFe<sub>2</sub>Al<sub>9</sub> a rare example of a three-dimensional material where pressure promotes rather than suppresses the CDW order.</p><h2 dir="ltr">Other Information</h2><p dir="ltr">Published in: Physical Review Letters<br>License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1103/dxzf-fx8k" target="_blank">https://dx.doi.org/10.1103/dxzf-fx8k</a></p>

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