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Anomalous pressure dependence of the charge density wave and fermi surface reconstruction in BaFe2Al9

We investigate the pressure evolution of charge density wave (CDW) order in the intermetallic compound BaFe2⁢Al9, 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...

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Hauptverfasser: Mohamed, Mahmoud (VerfasserIn) , Sundaramoorthy, Muthukumaran (VerfasserIn) , Jasim, Nabeel M. (VerfasserIn) , Irshad, K. A. (VerfasserIn) , Kuo, Chia Nung (VerfasserIn) , Lue, Chin Shan (VerfasserIn) , Carstens, Frederik (VerfasserIn) , Bertrand, A. (VerfasserIn) , Mito, M. (VerfasserIn) , Klingeler, Rüdiger (VerfasserIn) , Borisov, Vladislav (VerfasserIn) , Delin, Anna (VerfasserIn) , Joseph, Boby (VerfasserIn) , Eriksson, Olle (VerfasserIn) , Arumugam, Sonachalam (VerfasserIn) , Lingannan, Govindaraj (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2 December, 2025
In: Physical review letters
Year: 2025, Jahrgang: 135, Heft: 23, Pages: 1-7
ISSN:1079-7114
DOI:10.1103/dxzf-fx8k
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/dxzf-fx8k
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/dxzf-fx8k
Volltext
Verfasserangaben:Mahmoud Abdel-Hafiez, Muthukumaran Sundaramoorthy, Nabeel M. Jasim, K.A. Irshad, Chia Nung Kuo, Chin Shan Lue, F.L. Carstens, A. Bertrand, M. Mito, Rüdiger Klingeler, Vladislav Borisov, Anna Delin, Boby Joseph, Olle Eriksson, Sonachalam Arumugam, and Govindaraj Lingannan
Beschreibung
Zusammenfassung:We investigate the pressure evolution of charge density wave (CDW) order in the intermetallic compound BaFe2⁢Al9, 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 (𝑇CDW) 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 BaFe2⁢Al9 a rare example of a three-dimensional material where pressure promotes rather than suppresses the CDW order.
Beschreibung:Veröffentlicht: 2. Dezember 2025
Gesehen am 19.02.2026
Im Titel sind die Zahlen 2 und 9 tiefgestellt
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/dxzf-fx8k

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