Inelastic neutron scattering study on the electronic transition in ( Pr1-yYy)1-xCaxCoO3 single crystals

Moyoshi, Taketo; Kamazawa, Kazuya; Matsuda, Masaaki; Sato, Masatoshi

doi:10.1103/PhysRevB.98.205105

Title: Inelastic neutron scattering study on the electronic transition in ( $\Pr_{1 - y} Y_{y})_{1 - x} {Ca}_{x} {CoO}_{3}$ single crystals

Journal Article · Mon Nov 05 00:00:00 EST 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.205105· OSTI ID:1481688

Moyoshi, Taketo ^[1]; Kamazawa, Kazuya ^[1]; Matsuda, Masaaki ^[2]; Sato, Masatoshi ^[3]

Comprehensive Research Organization for Science and Society, Tokai (Japan). Neutron Science and Technology Center
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Nagoya Univ. (Japan). Graduate School of Science

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 $${\mathrm{Pr}}_{1{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$$.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Comprehensive Research Organization for Science and Society, Tokai (Japan); Nagoya Univ. (Japan)

Sponsoring Organization:: USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC05-00OR22725; JP17K05558

OSTI ID:: 1481688

Alternate ID(s):: OSTI ID: 1480894

Journal Information:: Physical Review B, Vol. 98, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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

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Title: Inelastic neutron scattering study on the electronic transition in ( $\Pr_{1 - y} Y_{y})_{1 - x} {Ca}_{x} {CoO}_{3}$ single crystals