Complete d-band dispersion relation in sodium cobaltates

D. Qian, L. Wray, D. Hsieh, L. Viciu, R. J. Cava, J. L. Luo, D. Wu, N. L. Wang, M. Z. Hasan

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Abstract

We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the complete d-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brillouin zone corner and the full quasiparticle band is found to emerge as a many-body entity lacking a pure orbital polarization. At low dopings, the quasiparticle bandwidth (Fermion scale, many-body EF∼0.25eV) is found to be smaller than most known oxide metals. The low-lying density of states is found to be in agreement with bulk-sensitive thermodynamic measurements for nonmagnetic dopings where the 2D Luttinger theorem is also observed to be satisfied.

Original languageEnglish (US)
Article number186405
JournalPhysical review letters
Volume97
Issue number18
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Qian, D., Wray, L., Hsieh, D., Viciu, L., Cava, R. J., Luo, J. L., Wu, D., Wang, N. L., & Hasan, M. Z. (2006). Complete d-band dispersion relation in sodium cobaltates. Physical review letters, 97(18), [186405]. https://doi.org/10.1103/PhysRevLett.97.186405