Observation of two charge ordering transitions in the valence-fluctuating EuPtP by resonant x-ray diffraction

T. Inami, S. Michimura, Akihiro Mitsuda, Hirofumi Wada

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Abstract

Two first-order phase transitions of the valence-fluctuating compound EuPtP at T1 =246K and T2 =200K were examined by means of resonant x-ray diffraction at the Eu L3 absorption edge. Although previous Mössbauer spectroscopy and preliminary x-ray diffraction experiments have suggested charge-ordered states, characteristic energy spectra of the 111 and 11 2/3 reflections observed in the present experiment unambiguously indicated that twofold and threefold superstructures of Eu valence exist below T2 and between T1 and T2, respectively. We also propose a mechanism to explain the charge ordering in EuPtP based on a charge-lattice coupling that alters a Coulomb repulsion.

Original languageEnglish
Article number195133
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number19
DOIs
Publication statusPublished - Nov 30 2010

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x ray diffraction
Diffraction
valence
X rays
energy spectra
Phase transitions
Experiments
Spectroscopy
spectroscopy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "Two first-order phase transitions of the valence-fluctuating compound EuPtP at T1 =246K and T2 =200K were examined by means of resonant x-ray diffraction at the Eu L3 absorption edge. Although previous M{\"o}ssbauer spectroscopy and preliminary x-ray diffraction experiments have suggested charge-ordered states, characteristic energy spectra of the 111 and 11 2/3 reflections observed in the present experiment unambiguously indicated that twofold and threefold superstructures of Eu valence exist below T2 and between T1 and T2, respectively. We also propose a mechanism to explain the charge ordering in EuPtP based on a charge-lattice coupling that alters a Coulomb repulsion.",
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T1 - Observation of two charge ordering transitions in the valence-fluctuating EuPtP by resonant x-ray diffraction

AU - Inami, T.

AU - Michimura, S.

AU - Mitsuda, Akihiro

AU - Wada, Hirofumi

PY - 2010/11/30

Y1 - 2010/11/30

N2 - Two first-order phase transitions of the valence-fluctuating compound EuPtP at T1 =246K and T2 =200K were examined by means of resonant x-ray diffraction at the Eu L3 absorption edge. Although previous Mössbauer spectroscopy and preliminary x-ray diffraction experiments have suggested charge-ordered states, characteristic energy spectra of the 111 and 11 2/3 reflections observed in the present experiment unambiguously indicated that twofold and threefold superstructures of Eu valence exist below T2 and between T1 and T2, respectively. We also propose a mechanism to explain the charge ordering in EuPtP based on a charge-lattice coupling that alters a Coulomb repulsion.

AB - Two first-order phase transitions of the valence-fluctuating compound EuPtP at T1 =246K and T2 =200K were examined by means of resonant x-ray diffraction at the Eu L3 absorption edge. Although previous Mössbauer spectroscopy and preliminary x-ray diffraction experiments have suggested charge-ordered states, characteristic energy spectra of the 111 and 11 2/3 reflections observed in the present experiment unambiguously indicated that twofold and threefold superstructures of Eu valence exist below T2 and between T1 and T2, respectively. We also propose a mechanism to explain the charge ordering in EuPtP based on a charge-lattice coupling that alters a Coulomb repulsion.

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