Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy

T. Sato, Takayoshi Yokoya, Y. Naitoh, T. Takahashi, K. Yamada, Y. Endoh

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Abstract

We have performed an ultrahigh-resolution (ΔE ∼ 7 meV) photoemission spectroscopy on La1.85Sr0.15CuO4 (Tc = 38 K) at 16-250 K. We found a pseudogap at EF with the size of 30-35 meV, which is gradually filled in by a transfer of states from the higher energy region with increasing temperature, but persists over 200 K. The gap energy is consistent with the characteristic temperatures of the magnetic susceptibility and the Hall coefficient. The temperature evolution is well scaled with that of the Hall coefficient. The pseudogap is not smoothly connected to the superconducting gap (Δ ∼ 8 meV) below Tc, suggesting a different origin from that in Bi2Sr2CaCu2O8.

Original languageEnglish
Pages (from-to)2254-2257
Number of pages4
JournalPhysical Review Letters
Volume83
Issue number11
Publication statusPublished - Sep 13 1999
Externally publishedYes

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photoelectric emission
Hall effect
spectroscopy
temperature
magnetic permeability
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy. / Sato, T.; Yokoya, Takayoshi; Naitoh, Y.; Takahashi, T.; Yamada, K.; Endoh, Y.

In: Physical Review Letters, Vol. 83, No. 11, 13.09.1999, p. 2254-2257.

Research output: Contribution to journalArticle

Sato, T, Yokoya, T, Naitoh, Y, Takahashi, T, Yamada, K & Endoh, Y 1999, 'Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy', Physical Review Letters, vol. 83, no. 11, pp. 2254-2257.
Sato, T. ; Yokoya, Takayoshi ; Naitoh, Y. ; Takahashi, T. ; Yamada, K. ; Endoh, Y. / Pseudogap of optimally doped La1.85Sr0.15CuO4 observed by ultrahigh-resolution photoemission spectroscopy. In: Physical Review Letters. 1999 ; Vol. 83, No. 11. pp. 2254-2257.
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