Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP

T. Koyama, T. Maruyama, K. Ueda, T. Mito, Akihiro Mitsuda, M. Umeda, M. Sugishima, Hirofumi Wada

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Abstract

EuPtP undergoes two valence transitions and has two kinds of valence states of Eu ions at low temperatures. In the charge-ordered state, this compound shows an antiferromagnetic order ascribed to magnetic divalent Eu ions. We investigated the antiferromagnetically ordered state of EuPtP by nuclear magnetic resonance (NMR) measurement and nuclear quadrupole resonance (NQR) measurement in a zero external magnetic field. The observed Eu153 NMR signals of a magnetic divalent state and Eu151,153 NQR signals of a nonmagnetic trivalent state clearly demonstrate that the spins order in the hexagonal basal plane and the internal magnetic field is not canceled out, even at the Eu3+ layers which are in the middle of magnetic Eu2+ layers. In addition, the observation of 31P and Pt195 NMR spectra allowed us to discuss a possible magnetic structure. We also evaluated the nuclear quadrupole frequencies for both Eu2+ and Eu3+ ion states.

Original languageEnglish
Article number094419
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number9
DOIs
Publication statusPublished - Mar 18 2015

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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