Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy

Shinji Wada, Hiroshi Sugiata, Daisuke Sawai, Takeshi Mito, Minoru Osada, Robert A. Fisher, Norman E. Phillips, Jeanne L. Luce, Angelica M. Stacy

Research output: Contribution to journalArticle

Abstract

We found evidence that two successive antiferromagnetic orderings of a rare earth cuprate NdCu2O4 (nonstandard monoclinic structure with magnetic Cu(1) and nonmagnetic Cu(2) sites) are strongly coupled with phonon mode anomalies. The nuclear quadrupole resonance frequency of 63,65Cu on the Cu(2) site shows a step decrease below each of the ordering temperatures TN1 ∼ 20 K and TN2 ∼ 10 K, that originates from changes in the symmetry of the charge distribution on the surrounding lattice. In the Raman spectrum, the shift of a phonon mode near 300 cm-1 displays an anomalous temperature dependence, which suggests a hardening of the lattice below TN1 and a softening below T N2. The Cu2+ spins on the Cu(1) site order antiferromagnetically below TN1, and the complex magnetic behavior is ascribed to the variations in the exchange interactions between the Cu(1) spins and in the paramagnetic spin polarization of Nd3+ below T N2.

Original languageEnglish
Pages (from-to)2076-2081
Number of pages6
JournalJournal of the Physical Society of Japan
Volume74
Issue number7
DOIs
Publication statusPublished - 2005 Jul
Externally publishedYes

Fingerprint

nuclear quadrupole resonance
cuprates
rare earth elements
Raman spectroscopy
anomalies
spectroscopy
hardening
softening
charge distribution
Raman spectra
temperature dependence
shift
symmetry
polarization
interactions
temperature

Keywords

  • Antiferromagnetic ordering
  • NdCuO
  • NMR
  • Phonon anomaly
  • Raman

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy. / Wada, Shinji; Sugiata, Hiroshi; Sawai, Daisuke; Mito, Takeshi; Osada, Minoru; Fisher, Robert A.; Phillips, Norman E.; Luce, Jeanne L.; Stacy, Angelica M.

In: Journal of the Physical Society of Japan, Vol. 74, No. 7, 07.2005, p. 2076-2081.

Research output: Contribution to journalArticle

Wada, Shinji ; Sugiata, Hiroshi ; Sawai, Daisuke ; Mito, Takeshi ; Osada, Minoru ; Fisher, Robert A. ; Phillips, Norman E. ; Luce, Jeanne L. ; Stacy, Angelica M. / Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy. In: Journal of the Physical Society of Japan. 2005 ; Vol. 74, No. 7. pp. 2076-2081.
@article{a7ac97f2e48c4eff9c9edb7dba947b97,
title = "Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy",
abstract = "We found evidence that two successive antiferromagnetic orderings of a rare earth cuprate NdCu2O4 (nonstandard monoclinic structure with magnetic Cu(1) and nonmagnetic Cu(2) sites) are strongly coupled with phonon mode anomalies. The nuclear quadrupole resonance frequency of 63,65Cu on the Cu(2) site shows a step decrease below each of the ordering temperatures TN1 ∼ 20 K and TN2 ∼ 10 K, that originates from changes in the symmetry of the charge distribution on the surrounding lattice. In the Raman spectrum, the shift of a phonon mode near 300 cm-1 displays an anomalous temperature dependence, which suggests a hardening of the lattice below TN1 and a softening below T N2. The Cu2+ spins on the Cu(1) site order antiferromagnetically below TN1, and the complex magnetic behavior is ascribed to the variations in the exchange interactions between the Cu(1) spins and in the paramagnetic spin polarization of Nd3+ below T N2.",
keywords = "Antiferromagnetic ordering, NdCuO, NMR, Phonon anomaly, Raman",
author = "Shinji Wada and Hiroshi Sugiata and Daisuke Sawai and Takeshi Mito and Minoru Osada and Fisher, {Robert A.} and Phillips, {Norman E.} and Luce, {Jeanne L.} and Stacy, {Angelica M.}",
year = "2005",
month = "7",
doi = "10.1143/JPSJ.74.2076",
language = "English",
volume = "74",
pages = "2076--2081",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "7",

}

TY - JOUR

T1 - Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy

AU - Wada, Shinji

AU - Sugiata, Hiroshi

AU - Sawai, Daisuke

AU - Mito, Takeshi

AU - Osada, Minoru

AU - Fisher, Robert A.

AU - Phillips, Norman E.

AU - Luce, Jeanne L.

AU - Stacy, Angelica M.

PY - 2005/7

Y1 - 2005/7

N2 - We found evidence that two successive antiferromagnetic orderings of a rare earth cuprate NdCu2O4 (nonstandard monoclinic structure with magnetic Cu(1) and nonmagnetic Cu(2) sites) are strongly coupled with phonon mode anomalies. The nuclear quadrupole resonance frequency of 63,65Cu on the Cu(2) site shows a step decrease below each of the ordering temperatures TN1 ∼ 20 K and TN2 ∼ 10 K, that originates from changes in the symmetry of the charge distribution on the surrounding lattice. In the Raman spectrum, the shift of a phonon mode near 300 cm-1 displays an anomalous temperature dependence, which suggests a hardening of the lattice below TN1 and a softening below T N2. The Cu2+ spins on the Cu(1) site order antiferromagnetically below TN1, and the complex magnetic behavior is ascribed to the variations in the exchange interactions between the Cu(1) spins and in the paramagnetic spin polarization of Nd3+ below T N2.

AB - We found evidence that two successive antiferromagnetic orderings of a rare earth cuprate NdCu2O4 (nonstandard monoclinic structure with magnetic Cu(1) and nonmagnetic Cu(2) sites) are strongly coupled with phonon mode anomalies. The nuclear quadrupole resonance frequency of 63,65Cu on the Cu(2) site shows a step decrease below each of the ordering temperatures TN1 ∼ 20 K and TN2 ∼ 10 K, that originates from changes in the symmetry of the charge distribution on the surrounding lattice. In the Raman spectrum, the shift of a phonon mode near 300 cm-1 displays an anomalous temperature dependence, which suggests a hardening of the lattice below TN1 and a softening below T N2. The Cu2+ spins on the Cu(1) site order antiferromagnetically below TN1, and the complex magnetic behavior is ascribed to the variations in the exchange interactions between the Cu(1) spins and in the paramagnetic spin polarization of Nd3+ below T N2.

KW - Antiferromagnetic ordering

KW - NdCuO

KW - NMR

KW - Phonon anomaly

KW - Raman

UR - http://www.scopus.com/inward/record.url?scp=24644496757&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=24644496757&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.74.2076

DO - 10.1143/JPSJ.74.2076

M3 - Article

AN - SCOPUS:24644496757

VL - 74

SP - 2076

EP - 2081

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 7

ER -