On the Control Parameters of the Quasi‐One Dimensional Superconductivity in Sc<sub>3</sub>CoC<sub>4</sub>

Eickerling, Georg; Hauf, Chrıstoph; Scheidt, Ernst‐Wilhelm; Reichardt, Lena; Schneider, Christian; Múñoz, A.; López-Moreno, S.; Romero, Aldo H.; Porcher, Florence; André, G.; Pöttgen, Rainer; Scherer, Wolfgang

doi:10.1002/zaac.201200517

Cited by 21 publications

(44 citation statements)

References 29 publications

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“…Additional scandium atom layers [Sc2 and Sc3; Fig. 1(c)] are interleaved along the c axis resulting in a large interlayer distance of 5.998 55 (5) Å between adjacent Sc1-Co-C layers [30][31][32][33][34][35][36][37].…”

Section: Structurallymentioning

confidence: 99%

“…Superconductivity in Sc 3 CoC 4 emerges below T c ≈ 4.5 K [30,34,35] and is anticipated by a Peierls-type structural transition below 72 K [30]. Therein, the orthorhombic hightemperature (HT) phase structure (space group Immm) is transformed into the monoclinic low-temperature (LT) phase structure (space group C2/m) by a doubling of the translational period along the [Co(C 2 ) 2 ] ∞ ribbons [30,34,36,38].…”

Section: Structurallymentioning

confidence: 99%

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Structure of the superconducting high-pressure phase of Sc3CoC4

et al. 2021

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We investigate pressure-induced structural changes to the Peierls-type distorted low-temperature phase of the low-dimensional Sc 3 CoC 4 as a possible origin of its pressure-enhanced superconductivity. By means of cryogenic high-pressure x-ray diffraction experiments we could reveal subtle, but significant structural differences between the low-temperature phase at ambient and elevated pressures. We could thus establish the structure of the superconducting phase of the title compound, which interestingly still shows the main features of the Peierls-type distorted low-temperature phase. This indicates that in contrast to other low-dimensional materials a suppression of periodic structural distortions is no prerequisite for superconductivity in the transition-metal carbide.

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Section: Structurallymentioning

confidence: 99%

Section: Structurallymentioning

confidence: 99%

Structure of the superconducting high-pressure phase of Sc3CoC4

et al. 2021

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“…Also, the Co and Ni species were different in terms of transport properties as the Co species shows a superconducting phase transition starting at 4.5 K and a structural phase transition with a Peierls type distortion at 72 K, leading to the formation of alternating short and long Co−Co distances perpendicular to the 1D chains. This phase transition in the Co congener can also be understood from a chemical bonding perspective . From the orbital point of view, it results from a splitting of

d_{z^{2}}

on Co at the Fermi level in the high temperature phase into bonding and non‐bonding states, which in real space leads to an asymmetry in the atomic graph around Co, reflecting the formation of chains of alternating bond strength.…”

Section: Materials Classesmentioning

confidence: 99%

“…This phase transition in the Co congener can also be understood from ac hemicalb ondingp erspective. [45] From the orbitalp oint of view,i tr esultsf rom as plitting of d z 2 on Co at the Fermi level in the high temperature phase into bonding and nonbondings tates, which in real space leads to an asymmetry in the atomic graph aroundC o, reflecting the formation of chains of alternating bond strength.…”

Section: Thermoelectric Materialsmentioning

confidence: 99%

Electron Density Studies in Materials Research

Tolborg

Iversen

2019

Chemistry A European J

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Rational material design requires a deep understanding about the relationship between the structure and properties of materials, which are both intimately related to their chemical bonding. Through the experimentally observable electron density, chemical bonding can be understood from experimental and theoretical points of view on an equal footing, and advances in accurate X‐ray diffraction measurements and computational techniques over the past decades have provided access to electron density distributions in increasingly complex functional materials. In this Review, selected electron density studies from the literature on a wide range of materials classes are presented, including studies of thermoelectric materials, high pressure electrides, coordination polymers and non‐linear optical materials. These studies demonstrate how detailed analysis of chemical bonding based on the electron density provides important understanding of materials beyond arguments based on structure and simple chemical concepts. In cases such as understanding the conducting properties of Zintl semiconductors or the effect of mutual electrical polarization in host–guest systems, it is clearly imperative to go beyond structure and examine the chemical bonding in detail. In the Review, the complementarity between theory and experiment is underlined, which allows for mutual validation of new chemical bonding concepts, and indeed experiment and theory may challenge each other based on the different strengths and weaknesses of each method.

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“…6 (x3.1), which has a limiting maximum value of I/ given by 1/g. and scandium cobalt carbide, 4 (Rohrmoser et al, 2007;Scherer et al, 2010;Eickerling et al, 2013), were used to represent inorganic compounds and minerals with medium to high absorption coefficients. Small crystals were chosen for this investigation in order to match the highly focused beams of the two microsources.…”

Section: Introductionmentioning

confidence: 99%