Mössbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO

Satoshi Higashitaniguchi, Makoto Seto, Shinji Kitao, Yasuhiro Kobayashi, Makina Saito, Masayuki Kurokuzu, Takaya Mitsui, Yoshitaka Yoda, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

An 57Fe Mössbauer spectroscopic study of iron-based layered superconductors La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic fields of up to 14 T was performed. Our results suggest that hyperfine fields induced by local magnetic moments are, if any, small and that the magnetic feature of Fe in La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 is most likely to be paramagnetism with itinerant electrons. This feature is confirmed both above and below the transition temperature for LaFeAsO 0.93F 0.07. Furthermore, the temperature dependence of the iron-specific phonon density of states in La 0.87Ca 0.13-FePO was measured by using the nuclear resonant inelastic scattering of synchrotron radiation. We have found that the temperature- dependent change in the iron-specific phonon density of states of La 0.87Ca 0.13FePO was smaller than that of LaFeAsO 0.89F 0.11.

Original languageEnglish
Article number024704
JournalJournal of the Physical Society of Japan
Volume78
Issue number2
DOIs
Publication statusPublished - 2009 Feb
Externally publishedYes

Fingerprint

inelastic scattering
iron
magnetic fields
spectroscopy
paramagnetism
synchrotron radiation
magnetic moments
transition temperature
temperature dependence
electrons
temperature

Keywords

  • Fe Mössbauer spectroscopy
  • Ca doping
  • F doping
  • La Ca FePO
  • LaFeAsO f
  • Magnetic moment
  • Nuclear resonant scattering
  • Phonon density of states
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Mössbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO. / Higashitaniguchi, Satoshi; Seto, Makoto; Kitao, Shinji; Kobayashi, Yasuhiro; Saito, Makina; Kurokuzu, Masayuki; Mitsui, Takaya; Yoda, Yoshitaka; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Journal of the Physical Society of Japan, Vol. 78, No. 2, 024704, 02.2009.

Research output: Contribution to journalArticle

Higashitaniguchi, Satoshi ; Seto, Makoto ; Kitao, Shinji ; Kobayashi, Yasuhiro ; Saito, Makina ; Kurokuzu, Masayuki ; Mitsui, Takaya ; Yoda, Yoshitaka ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Mössbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO. In: Journal of the Physical Society of Japan. 2009 ; Vol. 78, No. 2.
@article{6c0620bca2a84b8dbe9b6bbad449f972,
title = "M{\"o}ssbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO",
abstract = "An 57Fe M{\"o}ssbauer spectroscopic study of iron-based layered superconductors La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic fields of up to 14 T was performed. Our results suggest that hyperfine fields induced by local magnetic moments are, if any, small and that the magnetic feature of Fe in La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 is most likely to be paramagnetism with itinerant electrons. This feature is confirmed both above and below the transition temperature for LaFeAsO 0.93F 0.07. Furthermore, the temperature dependence of the iron-specific phonon density of states in La 0.87Ca 0.13-FePO was measured by using the nuclear resonant inelastic scattering of synchrotron radiation. We have found that the temperature- dependent change in the iron-specific phonon density of states of La 0.87Ca 0.13FePO was smaller than that of LaFeAsO 0.89F 0.11.",
keywords = "Fe M{\"o}ssbauer spectroscopy, Ca doping, F doping, La Ca FePO, LaFeAsO f, Magnetic moment, Nuclear resonant scattering, Phonon density of states, Superconductivity",
author = "Satoshi Higashitaniguchi and Makoto Seto and Shinji Kitao and Yasuhiro Kobayashi and Makina Saito and Masayuki Kurokuzu and Takaya Mitsui and Yoshitaka Yoda and Yoichi Kamihara and Masahiro Hirano and Hideo Hosono",
year = "2009",
month = "2",
doi = "10.1143/JPSJ.78.024704",
language = "English",
volume = "78",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "2",

}

TY - JOUR

T1 - Mössbauer spectroscopy of La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic field and nuclear resonant inelastic scattering of La 0.87Ca 0.13FePO

AU - Higashitaniguchi, Satoshi

AU - Seto, Makoto

AU - Kitao, Shinji

AU - Kobayashi, Yasuhiro

AU - Saito, Makina

AU - Kurokuzu, Masayuki

AU - Mitsui, Takaya

AU - Yoda, Yoshitaka

AU - Kamihara, Yoichi

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2009/2

Y1 - 2009/2

N2 - An 57Fe Mössbauer spectroscopic study of iron-based layered superconductors La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic fields of up to 14 T was performed. Our results suggest that hyperfine fields induced by local magnetic moments are, if any, small and that the magnetic feature of Fe in La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 is most likely to be paramagnetism with itinerant electrons. This feature is confirmed both above and below the transition temperature for LaFeAsO 0.93F 0.07. Furthermore, the temperature dependence of the iron-specific phonon density of states in La 0.87Ca 0.13-FePO was measured by using the nuclear resonant inelastic scattering of synchrotron radiation. We have found that the temperature- dependent change in the iron-specific phonon density of states of La 0.87Ca 0.13FePO was smaller than that of LaFeAsO 0.89F 0.11.

AB - An 57Fe Mössbauer spectroscopic study of iron-based layered superconductors La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 under external magnetic fields of up to 14 T was performed. Our results suggest that hyperfine fields induced by local magnetic moments are, if any, small and that the magnetic feature of Fe in La 0.87Ca 0.13FePO and LaFeAsO 0.93F 0.07 is most likely to be paramagnetism with itinerant electrons. This feature is confirmed both above and below the transition temperature for LaFeAsO 0.93F 0.07. Furthermore, the temperature dependence of the iron-specific phonon density of states in La 0.87Ca 0.13-FePO was measured by using the nuclear resonant inelastic scattering of synchrotron radiation. We have found that the temperature- dependent change in the iron-specific phonon density of states of La 0.87Ca 0.13FePO was smaller than that of LaFeAsO 0.89F 0.11.

KW - Fe Mössbauer spectroscopy

KW - Ca doping

KW - F doping

KW - La Ca FePO

KW - LaFeAsO f

KW - Magnetic moment

KW - Nuclear resonant scattering

KW - Phonon density of states

KW - Superconductivity

UR - http://www.scopus.com/inward/record.url?scp=60249093036&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=60249093036&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.78.024704

DO - 10.1143/JPSJ.78.024704

M3 - Article

AN - SCOPUS:60249093036

VL - 78

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 2

M1 - 024704

ER -