Unusual pseudogap features observed in iron oxypnictide superconductors

Yukiaki Ishida, Takahiro Shimojima, Kyoko Ishizaka, Takayuki Kiss, Mario Okawa, Tadashi Togashi, Shuntaro Watanabe, Xiaoyang Wang, Chuangtian Chen, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono, Shik Shin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (Tc = 26 K) and LaOFeP:F (Tc = 5 K) using He I line (h? = 21.2 eV) and laser (h? = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as ∼0.1 eV at 300 K, whereas LaFePO:F exhibits a ∼20-meV pseudogap. We discuss possible origin of the T -dependent pseudogap specifically observed in LaFeAsO:F through comparison with other materials that exhibit unusual T -dependent pseudogaps.

Original languageEnglish
Pages (from-to)61-64
Number of pages4
JournalJournal of the Physical Society of Japan
Volume77
Issue numberSUPPL. C
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

photoelectric emission
iron
spectroscopy
lasers
light sources
excitation
temperature

Keywords

  • Iron oxypnicite superconductors
  • Photoemission spectroscopy
  • Pseudogap

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ishida, Y., Shimojima, T., Ishizaka, K., Kiss, T., Okawa, M., Togashi, T., ... Shin, S. (2008). Unusual pseudogap features observed in iron oxypnictide superconductors. Journal of the Physical Society of Japan, 77(SUPPL. C), 61-64.

Unusual pseudogap features observed in iron oxypnictide superconductors. / Ishida, Yukiaki; Shimojima, Takahiro; Ishizaka, Kyoko; Kiss, Takayuki; Okawa, Mario; Togashi, Tadashi; Watanabe, Shuntaro; Wang, Xiaoyang; Chen, Chuangtian; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo; Shin, Shik.

In: Journal of the Physical Society of Japan, Vol. 77, No. SUPPL. C, 2008, p. 61-64.

Research output: Contribution to journalArticle

Ishida, Y, Shimojima, T, Ishizaka, K, Kiss, T, Okawa, M, Togashi, T, Watanabe, S, Wang, X, Chen, C, Kamihara, Y, Hirano, M, Hosono, H & Shin, S 2008, 'Unusual pseudogap features observed in iron oxypnictide superconductors', Journal of the Physical Society of Japan, vol. 77, no. SUPPL. C, pp. 61-64.
Ishida Y, Shimojima T, Ishizaka K, Kiss T, Okawa M, Togashi T et al. Unusual pseudogap features observed in iron oxypnictide superconductors. Journal of the Physical Society of Japan. 2008;77(SUPPL. C):61-64.
Ishida, Yukiaki ; Shimojima, Takahiro ; Ishizaka, Kyoko ; Kiss, Takayuki ; Okawa, Mario ; Togashi, Tadashi ; Watanabe, Shuntaro ; Wang, Xiaoyang ; Chen, Chuangtian ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo ; Shin, Shik. / Unusual pseudogap features observed in iron oxypnictide superconductors. In: Journal of the Physical Society of Japan. 2008 ; Vol. 77, No. SUPPL. C. pp. 61-64.
@article{73125ff921e347339f3c8e6d87ebd805,
title = "Unusual pseudogap features observed in iron oxypnictide superconductors",
abstract = "We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (Tc = 26 K) and LaOFeP:F (Tc = 5 K) using He I line (h? = 21.2 eV) and laser (h? = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as ∼0.1 eV at 300 K, whereas LaFePO:F exhibits a ∼20-meV pseudogap. We discuss possible origin of the T -dependent pseudogap specifically observed in LaFeAsO:F through comparison with other materials that exhibit unusual T -dependent pseudogaps.",
keywords = "Iron oxypnicite superconductors, Photoemission spectroscopy, Pseudogap",
author = "Yukiaki Ishida and Takahiro Shimojima and Kyoko Ishizaka and Takayuki Kiss and Mario Okawa and Tadashi Togashi and Shuntaro Watanabe and Xiaoyang Wang and Chuangtian Chen and Yoichi Kamihara and Masahiro Hirano and Hideo Hosono and Shik Shin",
year = "2008",
language = "English",
volume = "77",
pages = "61--64",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "SUPPL. C",

}

TY - JOUR

T1 - Unusual pseudogap features observed in iron oxypnictide superconductors

AU - Ishida, Yukiaki

AU - Shimojima, Takahiro

AU - Ishizaka, Kyoko

AU - Kiss, Takayuki

AU - Okawa, Mario

AU - Togashi, Tadashi

AU - Watanabe, Shuntaro

AU - Wang, Xiaoyang

AU - Chen, Chuangtian

AU - Kamihara, Yoichi

AU - Hirano, Masahiro

AU - Hosono, Hideo

AU - Shin, Shik

PY - 2008

Y1 - 2008

N2 - We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (Tc = 26 K) and LaOFeP:F (Tc = 5 K) using He I line (h? = 21.2 eV) and laser (h? = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as ∼0.1 eV at 300 K, whereas LaFePO:F exhibits a ∼20-meV pseudogap. We discuss possible origin of the T -dependent pseudogap specifically observed in LaFeAsO:F through comparison with other materials that exhibit unusual T -dependent pseudogaps.

AB - We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (Tc = 26 K) and LaOFeP:F (Tc = 5 K) using He I line (h? = 21.2 eV) and laser (h? = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as ∼0.1 eV at 300 K, whereas LaFePO:F exhibits a ∼20-meV pseudogap. We discuss possible origin of the T -dependent pseudogap specifically observed in LaFeAsO:F through comparison with other materials that exhibit unusual T -dependent pseudogaps.

KW - Iron oxypnicite superconductors

KW - Photoemission spectroscopy

KW - Pseudogap

UR - http://www.scopus.com/inward/record.url?scp=57649123541&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=57649123541&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:57649123541

VL - 77

SP - 61

EP - 64

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - SUPPL. C

ER -