Chemical ordering suppresses large-scale electronic phase separation in doped manganites

Zhu, Yinyan; Du, Kai; Niu, Jiebin; Lin, Ling-Fang; Wei, Wutao; Líu, Hao; Lin, Huang; Zhang, Kai; Yang, Tieying; Kou, Yunfang; Shao, Jian; Gao, Xingyu; Xu, Xiaoshan; Wu, Xiaoshan; Dong, Shuai; Yin, Lifeng; Shen, Jian

doi:10.1038/ncomms11260

Cited by 77 publications

(43 citation statements)

References 52 publications

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“…Another important difference is that phase separation in manganites is associated with substantial intrinsic disorder due to cation mixing, and a recent study has demonstrated that chemical ordering of cations in (La 1− y Pr y ) 1−x Ca x MnO 3 suppresses long range phase separation 18 . CaFe 3 O 5 is in principle a stoichiometric material although small strain variations due to the 4% substitution of Fe for Ca observed in our polycrystalline sample may tip the local balance between the energies of the two ground states leading to phase coexistence.…”

Section: Resultsmentioning

confidence: 99%

Long range electronic phase separation in CaFe3O5

et al. 2018

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Incomplete transformations from ferromagnetic to charge ordered states in manganite perovskites lead to phase-separated microstructures showing colossal magnetoresistances. However, it is unclear whether electronic matter can show spontaneous separation into multiple phases distinct from the high temperature state. Here we show that paramagnetic CaFe3O5 undergoes separation into two phases with different electronic and spin orders below their joint magnetic transition at 302 K. One phase is charge, orbital and trimeron ordered similar to the ground state of magnetite, Fe3O4, while the other has Fe2+/Fe3+charge averaging. Lattice symmetry is unchanged but differing strains from the electronic orders probably drive the phase separation. Complex low symmetry materials like CaFe3O5 where charge can be redistributed between distinct cation sites offer possibilities for the generation and control of electronic phase separated nanostructures.

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Section: Resultsmentioning

confidence: 99%

Long range electronic phase separation in CaFe3O5

et al. 2018

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“…In a broader sense, the term electronic phase separation is used whenever two or more phases with differing electronic or magnetic properties coexist on microscopic length scales, including cases where the electronic phase separation is driven by inhomogeneities of the chemical composition or structural disorder [45,46].…”

Section: Control Of Separate Electronic Phasesmentioning

confidence: 99%

Influence of oxygen vacancies on two-dimensional electron systems at SrTiO3-based interfaces and surfaces

Sing

Jeschke

Lechermann

et al. 2017

Eur. Phys. J. Spec. Top.

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Abstract. The insulator SrTiO 3 can host high-mobility twodimensional electron systems on its surfaces and at interfaces with other oxides. While for the bare surface a two-dimensional electron system can only be induced by oxygen vacancies, it is believed that the metallicity of heterostructure interfaces as in LaAlO 3/SrTiO3 is caused by other mechanisms related to the polar discontinuity at the interface. Based on calculations using density functional and dynamical mean-field theory as well as on experimental results using photoemission spectroscopy we elucidate the role of oxygen vacancies, thereby highlighting their importance for the electronic and magnetic properties of the systems under study.

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“…For instance, the random distribution of dopants produces nanoscale electronic inhomogeneity in some of the high T c cuprates [3][4][5][6] , chemical ordering of Pr suppresses large-scale electronic phase separation in maganites 7 or charge ordering in CoO 2 layers intertwines with ordering of the mobile Na + ions in Na x CoO 2 .…”

Section: Introductionmentioning

confidence: 99%

Cu63-NMR study of oxygen disorder in ortho-IIYBa2Cu3Oy

Wu¹,

Zhou²,

Hirata³

et al. 2016

Phys. Rev. B

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We show that 63 Cu NMR spectra place strong constraints on both the nature and the concentration of oxygen defects in ortho-II YBa2Cu3Oy. Systematic deviation from ideal ortho-II order is revealed by the presence of inequivalent Cu sites in either full or empty chains. The results can be explained by two kinds of defects: oxygen clustering into additional chains, or fragments thereof, most likely present at all concentrations (6.4 < y < 6.6) and oxygen vacancies randomly distributed in the full chains for y < 6.50 only. Furthermore, the remarkable reproducibility of the spectra in different samples with optimal ortho-II order (y 6.55) shows that chain-oxygen disorder, known to limit electronic coherence, is ineluctable because it is inherent to these compounds.

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Chemical ordering suppresses large-scale electronic phase separation in doped manganites

Cited by 77 publications

References 52 publications

Long range electronic phase separation in CaFe3O5

Long range electronic phase separation in CaFe3O5

Influence of oxygen vacancies on two-dimensional electron systems at SrTiO3-based interfaces and surfaces

Cu63-NMR study of oxygen disorder in ortho-IIYBa2Cu3Oy

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