Phys. Rev. Lett. 85, 5428–5431 (2000)Anisotropic Optical Spectra of PrBa2Cu4O8: Possible Tomonaga-Luttinger Liquid Response of the Quasi-One-Dimensional Metallic CuO Double ChainsReceived 10 May 2000; published in the issue dated 18 December 2000 The optical spectra of PrBa2Cu4O8 show large in-plane anisotropy. For the a polarization ( E ⊥ chain), the spectrum is characterized by a gap of 1.4 eV, indicating the charge-transfer insulating nature of the CuO2 planes. For the metallic chain direction ( E∥b), the spectrum deviates from a simple Drude response; reflectivity Rb(ω) shows a sharp edge at ∼1eV but it also shows a dip at ∼15meV, which splits the conductivity spectrum into two parts—a zero-energy mode with small weight and a pronounced 40meV mode. These features are discussed in terms of a Tomonaga-Luttinger liquid in a doped 1D Mott insulator and compared with 1D Bechgaard salts. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.5428
DOI:
10.1103/PhysRevLett.85.5428
PACS:
78.20.-e, 72.15.-v, 74.72.Jt
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