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

doi:10.1143/JPSJ.78.024704

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 journal › Article › peer-review

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 language	English
Article number	024704
Journal	Journal of the Physical Society of Japan
Volume	78
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.78.024704
Publication status	Published - 2009 Feb
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.78.024704

Cite this

Higashitaniguchi, S., Seto, M., Kitao, S., Kobayashi, Y., Saito, M., Kurokuzu, M., Mitsui, T., Yoda, Y., Kamihara, Y., Hirano, M., & Hosono, H. (2009). 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. Journal of the Physical Society of Japan, 78(2), Article 024704. https://doi.org/10.1143/JPSJ.78.024704

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

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

Higashitaniguchi, S, Seto, M, Kitao, S, Kobayashi, Y, Saito, M, Kurokuzu, M, Mitsui, T, Yoda, Y, Kamihara, Y, Hirano, M & Hosono, H 2009, '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', Journal of the Physical Society of Japan, vol. 78, no. 2, 024704. https://doi.org/10.1143/JPSJ.78.024704

@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 = "Ca doping, F doping, Fe M{\"o}ssbauer spectroscopy, 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 = feb,

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 - Ca doping

KW - F doping

KW - Fe Mössbauer spectroscopy

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

SN - 0031-9015

VL - 78

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 2

M1 - 024704

ER -