Phenomenological Dynamical Mean-Field Theory of Temperature-Dependent Optical Conductivity and Metal-Insulator Transition in La0.7Ca0.3MnO3

Authors

• Listiana Satiawati, Petroleum Engineering Department, Faculty of Earth and Energy Technology, Universitas Trisakti, Jakarta 11440, IndonesiaFollow
• Adam Badra Cahaya, Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, IndonesiaFollow
• Eddwi Hesky Hasdeo, Research Center for Physics, Indonesian Institute of Sciences, Kompleks Puspiptek, Serpong 15314, IndonesiaFollow
• Muhammad Aziz Majidi, Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, IndonesiaFollow
• Anto Sulaksono, Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, IndonesiaFollow
• Andrivo Rusydi, Department of Physics, National University of Singapore, Singapore 117542, SingaporeFollow

Abstract

As an extension of our previous theoretical study, we perform temperature-dependent optical conductivity calculations on La_0.7Ca_0.3MnO₃ over a wide photon-energy range up to ∼22 eV, aiming to capture the metal–insulator transition while preserving the general temperature-dependent profile at higher photon energies. The system is modeled with simple Mn–O coordination via the tight-binding method, where some hopping integrals are considered functions of magnetization. Upon incorporating the static Jahn–Teller effect with Coulomb–Hubbard and magnetic exchange interactions, with the exception of a quantitative difference in the calculated of  K versus the experimental value (260 K) and discrepancies in the mid-energy regime, the results reproduce the qualitative temperature-dependent optical conductivity trends, especially for the low- and high-energy regimes, as observed in the experimental data. This qualitative agreement is achieved by setting the magnetization-dependent hopping parameters for the Mn–O hopping parameters,  and , as , with  eV,  eV,  eV,  eV,  eV, and  eV. The results underscore the importance of correlation effects arising from the interplay of the lattice, charge, and magnetic degrees of freedom in determining the overall profile of the temperature-dependent optical response of manganite, connecting the physics of the high-energy optical response and the transport properties at the dc limit.

Recommended Citation

Satiawati, Listiana; Cahaya, Adam Badra; Hasdeo, Eddwi Hesky; Majidi, Muhammad Aziz; Sulaksono, Anto; and Rusydi, Andrivo (2026) "Phenomenological Dynamical Mean-Field Theory of Temperature-Dependent Optical Conductivity and Metal-Insulator Transition in La0.7Ca0.3MnO3," Makara Journal of Science: Vol. 30: Iss. 2, Article 5.
DOI: 10.7454/mss.v30i2.3165
Available at: https://scholarhub.ui.ac.id/science/vol30/iss2/5