skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Inelastic neutron scattering study on the electronic transition in ( Pr 1 - y Y y ) 1 - x Ca x CoO 3 single crystals

Abstract

The perovskite Co oxides $${\mathrm{Pr}}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$$ exhibit at around $$x{\sim}0.5$$ an unusual transition at temperature $${T}_{\mathrm{S}}$$ [S. Tsubouchi et al. Phys. Rev. B 66, 052418 (2002)] with no space group change and no long-range magnetic order. We measured inelastic neutron scattering intensities of magnetic excitations $$I({Q},{\omega}$$) for two single crystals of ($${\mathrm{Pr}}_{1{-}y}{\mathrm{Y}}_{y}{)}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$$ in which the $x$ region of the transition is widened by the Pr-site doping to study whether the recent proposal of the excitonic condensation model is relevant to this "hidden order transition" of the system. While $${{\chi}}^{{'}{'}}({Q},{\omega})$$ seems to have characteristics of strongly correlated Co $3d$ electrons above $${T}_{\mathrm{S}}$$, it abruptly exhibits a weak feature reminiscent of a pseudogaplike structure at $${T}_{\mathrm{S}}$$ with decreasing $T$. The first peak of the Pr crystal-field excitations has also been observed at low temperatures. Using a model of the coexistence of the exciton condensed phase (EC phase) with the nearly or weakly ferromagnetic one, we show that the EC phase appears as the collective transition in $${\mathrm{Pr}}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$$.

Authors:
 [1];  [1];  [2];  [3]
  1. Comprehensive Research Organization for Science and Society, Tokai (Japan). Neutron Science and Technology Center
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Nagoya Univ. (Japan). Graduate School of Science
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Comprehensive Research Organization for Science and Society, Tokai (Japan); Nagoya Univ. (Japan)
Sponsoring Org.:
USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1481688
Alternate Identifier(s):
OSTI ID: 1480894
Grant/Contract Number:  
AC05-00OR22725; JP17K05558
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; excitons; quasiparticles; inelastic neutron scattering

Citation Formats

Moyoshi, Taketo, Kamazawa, Kazuya, Matsuda, Masaaki, and Sato, Masatoshi. Inelastic neutron scattering study on the electronic transition in ( Pr1-yYy)1-xCaxCoO3 single crystals. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.205105.
Moyoshi, Taketo, Kamazawa, Kazuya, Matsuda, Masaaki, & Sato, Masatoshi. Inelastic neutron scattering study on the electronic transition in ( Pr1-yYy)1-xCaxCoO3 single crystals. United States. doi:10.1103/PhysRevB.98.205105.
Moyoshi, Taketo, Kamazawa, Kazuya, Matsuda, Masaaki, and Sato, Masatoshi. Mon . "Inelastic neutron scattering study on the electronic transition in ( Pr1-yYy)1-xCaxCoO3 single crystals". United States. doi:10.1103/PhysRevB.98.205105. https://www.osti.gov/servlets/purl/1481688.
@article{osti_1481688,
title = {Inelastic neutron scattering study on the electronic transition in ( Pr1-yYy)1-xCaxCoO3 single crystals},
author = {Moyoshi, Taketo and Kamazawa, Kazuya and Matsuda, Masaaki and Sato, Masatoshi},
abstractNote = {The perovskite Co oxides ${\mathrm{Pr}}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$ exhibit at around $x{\sim}0.5$ an unusual transition at temperature ${T}_{\mathrm{S}}$ [S. Tsubouchi et al. Phys. Rev. B 66, 052418 (2002)] with no space group change and no long-range magnetic order. We measured inelastic neutron scattering intensities of magnetic excitations $I({Q},{\omega}$) for two single crystals of (${\mathrm{Pr}}_{1{-}y}{\mathrm{Y}}_{y}{)}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$ in which the $x$ region of the transition is widened by the Pr-site doping to study whether the recent proposal of the excitonic condensation model is relevant to this "hidden order transition" of the system. While ${{\chi}}^{{'}{'}}({Q},{\omega})$ seems to have characteristics of strongly correlated Co $3d$ electrons above ${T}_{\mathrm{S}}$, it abruptly exhibits a weak feature reminiscent of a pseudogaplike structure at ${T}_{\mathrm{S}}$ with decreasing $T$. The first peak of the Pr crystal-field excitations has also been observed at low temperatures. Using a model of the coexistence of the exciton condensed phase (EC phase) with the nearly or weakly ferromagnetic one, we show that the EC phase appears as the collective transition in ${\mathrm{Pr}}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$.},
doi = {10.1103/PhysRevB.98.205105},
journal = {Physical Review B},
issn = {2469-9950},
number = 20,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Simultaneous Metal–Insulator and Spin-State Transition in (Pr 1- y RE y ) 1- x Ca x CoO 3 (RE=Nd, Sm, Gd, and Y)
journal, March 2010

  • Naito, Tomoyuki; Sasaki, Hiroko; Fujishiro, Hiroyuki
  • Journal of the Physical Society of Japan, Vol. 79, Issue 3
  • DOI: 10.1143/JPSJ.79.034710

Spin-state transition in Pr 0.5 Ca 0.5 CoO 3 analyzed by x-ray absorption and emission spectroscopies
journal, September 2012


Spin fluctuations in superconducting YBa_{2}Cu_{3}O_{6.5}
journal, February 1990


Excitonic condensation of strongly correlated electrons: The case of Pr 0.5 Ca 0.5 CoO 3
journal, December 2014


Low-Energy Excitation Spectra in the Excitonic Phase of Cobalt Oxides
journal, April 2017

  • Yamaguchi, Tomoki; Sugimoto, Koudai; Ohta, Yukinori
  • Journal of the Physical Society of Japan, Vol. 86, Issue 4
  • DOI: 10.7566/JPSJ.86.043701

Neutron scattering study of the YBa2Cu3O6+x system
journal, December 1991


Unusual electronic structure of PrBa 2 Cu 3 O 7
journal, May 1993


Phase transition in Pr0.5Ca0.5CoO3 and related cobaltites
journal, July 2013


Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr 1 y Tb y ) 0.7 Ca 0.3 CoO 3
journal, April 2013


Excitonic condensation in systems of strongly correlated electrons
journal, July 2015


Spin-state transitions in PrCoO 3 investigated by neutron scattering
journal, October 2011


Simultaneous metal-insulator and spin-state transitions in Pr 0.5 Ca 0.5 CoO 3
journal, August 2002


On the Mechanism of the Spin State Transition of (Pr 1- y Sm y ) 1- x Ca x CoO 3
journal, August 2005

  • Fujita, Toshiaki; Kawabata, Shohei; Sato, Masatoshi
  • Journal of the Physical Society of Japan, Vol. 74, Issue 8
  • DOI: 10.1143/JPSJ.74.2294

Excitonic instability at the spin-state transition in the two-band Hubbard model
journal, March 2014


Electrical resistivity and thermopower measurements of the hole- and electron-doped cobaltites Ln CoO 3
journal, July 2008


Phase diagram of exciton condensate in doped two-band Hubbard model
journal, December 2014


Role of A -site cations in the metal-insulator transition in Pr 0.5 Ca 0.5 CoO 3 γ ( γ 0 )
journal, February 2010

  • Barón-González, A. J.; Frontera, C.; García-Muñoz, J. L.
  • Physical Review B, Vol. 81, Issue 5
  • DOI: 10.1103/PhysRevB.81.054427

Phase diagram and collective excitations in an excitonic insulator from an orbital physics viewpoint
journal, May 2016


Transport and Magnetic Studies on the Spin State Transition of Pr 1- x Ca x CoO 3 up to High Pressure
journal, July 2004

  • Fujita, Toshiaki; Miyashita, Takeshi; Yasui, Yukio
  • Journal of the Physical Society of Japan, Vol. 73, Issue 7
  • DOI: 10.1143/JPSJ.73.1987

Crystal field and magnetism of Pr 3+ and Nd 3+ ions in orthorhombic perovskites
journal, October 2013


Transport and Magnetic Properties of R 1- x A x CoO 3 (R = La, Pr and Nd; A = Ba, Sr and Ca)
journal, April 2003

  • Masuda, Hiroyasu; Fujita, Toshiaki; Miyashita, Takeshi
  • Journal of the Physical Society of Japan, Vol. 72, Issue 4
  • DOI: 10.1143/JPSJ.72.873

Neutron Scattering Study of CoO 6 Distortion and Its Relation to the Spin-State Transition in Pr 0.5 Ca 0.5 CoO 3
journal, March 2009

  • Tong, Peng; Wu, Yongsu; Kim, Bongju
  • Journal of the Physical Society of Japan, Vol. 78, Issue 3
  • DOI: 10.1143/JPSJ.78.034702

Valence Shift of Pr Ion from 3+ to 4+ in (Pr 1- y Y y ) 0.7 Ca 0.3 CoO 3 Estimated by X-Ray Absorption Spectroscopy
journal, June 2012

  • Fujishiro, Hiroyuki; Naito, Tomoyuki; Ogawa, Satoru
  • Journal of the Physical Society of Japan, Vol. 81, Issue 6
  • DOI: 10.1143/JPSJ.81.064709

Inelastic neutron scattering study of phonons and magnetic excitations in LaCoO 3
journal, November 2005


Magnetically inhomogeneous ground state below the first-order valence transition in ( Pr 1 y Y y ) 0.7 Ca 0.3 Co O 3 δ
journal, May 2014


Hole-Doping Effect on the Spin State and Microscopic Magnetic Properties of L a 1- x S r x C o O 3 (0≤ x ≤0.5): 59 C o and 139 L a NMR Measurements
journal, March 1995

  • Itoh, Masayuki; Natori, Ikuomi
  • Journal of the Physical Society of Japan, Vol. 64, Issue 3
  • DOI: 10.1143/JPSJ.64.970

Magnetic-field-induced spin crossover of Y-doped Pr 0.7 Ca 0.3 CoO 3
journal, September 2016


Metal-insulator transition and the Pr 3 + / Pr 4 + valence shift in ( Pr 1 y Y y ) 0.7 Ca 0.3 CoO 3
journal, October 2010


Competing phases in a model of Pr-based cobaltites
journal, December 2017


Crystal-field levels in the distorted perovskite PrGaO 3
journal, May 1994

  • Podlesnyak, A.; Rosenkranz, S.; Fauth, F.
  • Journal of Physics: Condensed Matter, Vol. 6, Issue 22
  • DOI: 10.1088/0953-8984/6/22/009

Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2
journal, December 2009

  • Inosov, D. S.; Park, J. T.; Bourges, P.
  • Nature Physics, Vol. 6, Issue 3
  • DOI: 10.1038/nphys1483

Electric, magnetic, and calorimetric properties and phase diagram of Pr 1 x Ca x CoO 3 ( 0 <~ x <~ 0 . 5 5 )
journal, April 2004