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Anomalous Pressure Dependence of the Charge Density Wave and Fermi Surface Reconstruction in BaFe2Al9

Mahmoud Abdel-Hafiez1,2,*, Muthukumaran Sundaramoorthy3,4, Nabeel M. Jasim1, K. A. Irshad4, Chia Nung Kuo5,6, Chin Shan Lue5,6, F. L. Carstens7, A. Bertrand8, M. Mito8 et al.

Rüdiger Klingeler7, Vladislav Borisov9,10, Anna Delin11,12, Boby Joseph4, Olle Eriksson9,10, Sonachalam Arumugam3,13,†, and Govindaraj Lingannan3,4,14,‡

  • *Contact author: mahmoudhafiez@gmail.com
  • †Contact author: sarumugam1963@yahoo.com
  • ‡Contact author: lgovindphy@gmail.com
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Phys. Rev. Lett. 135, 236502 – Published 2 December, 2025

DOI: https://doi.org/10.1103/dxzf-fx8k

Abstract

We investigate the pressure evolution of charge density wave (CDW) order in the intermetallic compound BaFe2Al9, which undergoes a pronounced first-order CDW transition ∼112  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 BaFe2Al9 a rare example of a three-dimensional material where pressure promotes rather than suppresses the CDW order.

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Phys. Rev. Lett. 135, 236502– Published 2 December, 2025
  • Received 7 August 2025
  • Revised 16 September 2025
  • Accepted 6 November 2025
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