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

doi:10.1143/JPSJS.77SC.61

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs:F (T_c = 26 K) and LaOFeP:F (T_c = 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 language	English
Pages (from-to)	61-64
Number of pages	4
Journal	journal of the physical society of japan
Volume	77
Issue number	SUPPL. C
DOIs	https://doi.org/10.1143/JPSJS.77SC.61
Publication status	Published - 2008
Externally published	Yes

Keywords

Iron oxypnicite superconductors
Photoemission spectroscopy
Pseudogap

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJS.77SC.61

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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",

doi = "10.1143/JPSJS.77SC.61",

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

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U2 - 10.1143/JPSJS.77SC.61

DO - 10.1143/JPSJS.77SC.61

M3 - Article

AN - SCOPUS:57649123541

SN - 0031-9015

VL - 77

SP - 61

EP - 64

JO - journal of the physical society of japan

JF - journal of the physical society of japan

IS - SUPPL. C

ER -

Unusual pseudogap features observed in iron oxypnictide superconductors

Abstract

Keywords

ASJC Scopus subject areas

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