Abstract
Using angle-resolved photoemission spectroscopy, we present the electronic structure of the metallic ground state of La₂₋₂ₓSr₁₊₂ₓMn₂O₇ (x≈0.59) and interpret the results in terms of first-principles band-structure computations, of which the generalized gradient approximation yields the best agreement with the experimental data. No bilayer-split bands are found in this compound, indicating the near degeneracy of electronic states in the neighboring MnO₂ layers due to its A-type antiferromagnetic structure. The d₃z2₋r2 states near the zone center were not observed, which is also consistent with its A-type antiferromagnetic structure. Near the Fermi level, a kink in the dispersion reveals an important electron-phonon many-body interaction. The electron-phonon coupling is ~1 near the zone boundary and ~2 near the zone diagonal, showing strong k dependence.
Keywords
photoemission spectroscopy, Fermi level, metallic ground state, La2−2xSr1+2xMn2O7, angle-resolved photoemission, ARPES
Subject Categories
Photoemission, Fermi surfaces, Spectrum analysis
Disciplines
Physics
Publisher
American Physical Society
Publication Date
8-1-2008
Rights Information
Copyright 2008 American Physical Society.
Rights Holder
American Physical Society
Recommended Citation
Sun, Z.; Douglas, J. F.; Wang, Q.; Dessau, D. S.; Fedorov, A. V.; Lin, H.; Sahrakorpi, S.; Barbiellini, B.; Markiewicz, R. S.; Bansil, A.; Zheng, H.; and Mitchell, J. F., "Electronic structure of the metallic ground state of La2−2xSr1+2xMn2O7 for x≈0.59 and comparison with x=0.36,0.38 compounds as revealed by angle-resolved photoemission" (2008). Physics Faculty Publications. Paper 377.
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Notes
Originally published in Physical Review B v.78 (2008): 075101. DOI: 10.1103/PhysRevB.78.075101