Fluctuations and nonuniformities in strongly correlated electronic systems

Boyarskii, L.A.; Габуда, С. П.; Kozlova, S. G.

doi:10.1063/1.1884434

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…Spatiotemporal fluctuations of electronic charge, orbital, and spin are native to the quantum materials realm [1][2][3][4][5], encompassing phenomena ranging from unconventional superconductivity [6,7], charge density waves [8,9], and pseudogaps [10] to metal-insulator transitions [11,12], colossal magnetoresistivity [13], and frustrated magnetism [14,15]. Elucidating the character and role of electronic short-range correlations in the emergence of application-relevant phases [16][17][18][19][20][21][22][23][24][25] is challenging as most experimental probes yield bulk averages [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Role of local Ru hexamers in superconductivity of ruthenium phosphide

Božin

Koch

Aryal

et al. 2022

Preprint

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Superconductivity in binary ruthenium pnictides occurs proximal to and upon suppression of a mysterious non-magnetic ground state, preceded by a pseudogap phase associated with Fermi surface instability, and its critical temperature, Tc, is maximized around the pseudogap quantum critical point. By analogy with isoelectronic iron based counterparts, antiferromagnetic fluctuations became "usual suspects" as putative mediators of superconducting pairing. Here we report on a high temperature local symmetry breaking in RuP, the parent of the maximum-Tc branch of these novel superconductors, revealed by combined nanostructure-sensitive powder and single crystal X-ray total scattering experiments. Large local Ru6 hexamer distortions associated with orbital-charge trimerization form above the two-stage electronic transition in RuP. While hexamer ordering enables the nonmagnetic ground state and presumed complex oligomerization, the relevance of pseudogap fluctuations for superconductivity emerges as a distinct prospect. As a transition metal system in which partial d-manifold filling combined with high crystal symmetry promotes electronic instabilities, this represents a further example of local electronic precursors underpinning the macroscopic collective behavior of quantum materials.

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Section: Introductionmentioning

confidence: 99%

Role of local Ru hexamers in superconductivity of ruthenium phosphide

Božin

Koch

Aryal

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Spatiotemporal fluctuations of electronic charge, orbital, and spin are native to the quantum materials realm [1][2][3][4][5], encompassing phenomena ranging from unconventional superconductivity (SC) [6,7], charge density waves [8,9], and pseudogaps (PGs) [10] to metal-insulator transitions [11,12], colossal magnetoresistivity [13], and frustrated magnetism [14,15]. Elucidating the character and role of electronic shortrange correlations in the emergence of application-relevant phases [16][17][18][19][20][21][22][23][24][25] is challenging as most experimental probes yield bulk averages [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Fluctuating Ru trimer precursor to a two-stage electronic transition in RuP

et al. 2022

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Superconductivity in binary ruthenium pnictides occurs proximal to and upon suppression of a nonmagnetic ground state, preceded by a pseudogap phase associated with Fermi surface instability, and its critical temperature, T c , is maximized around the pseudogap quantum critical point. By analogy with isoelectronic iron-based counterparts, antiferromagnetic fluctuations became "usual suspects" as putative mediators of superconducting pairing. Here we report on a high-temperature local symmetry breaking in RuP, the nonsuperconducting parent of the maximum-T c branch of these novel superconductors, revealed by combined nanostructure-sensitive powder and single-crystal x-ray total scattering analyses. Large local distortions of Ru chains associated with orbital-charge trimerization, further assembled into hexamers, exist above the two-stage electronic transition in RuP. In the pseudogap regime the precursors order with distortions retaining their strength, whereas they acquire spin-singlet characteristics which dramatically enhances the distortion as the nonmagnetic ground state establishes. The precursors enable the nonmagnetic ground state and presumed complex oligomerization, and the relevance of pseudogap fluctuations for superconductivity emerges as a distinct prospect. As a transition metal system in which partial d-manifold filling combined with high crystal symmetry promotes electronic instabilities, this represents a further example of local electronic precursors underpinning the macroscopic collective behavior of quantum materials.

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Pseudogap effects in strongly correlated electron systems

Boyarsky

2006

Low Temperature Physics

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Fluctuations and nonuniformities in strongly correlated electronic systems

Cited by 4 publications

References 16 publications

Role of local Ru hexamers in superconductivity of ruthenium phosphide

Role of local Ru hexamers in superconductivity of ruthenium phosphide

Fluctuating Ru trimer precursor to a two-stage electronic transition in RuP

Pseudogap effects in strongly correlated electron systems

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