Article,

Evolution of structure and electronic correlations in a series of BaT$_2$As$_2$ (T = Cr–Cu) single crystals

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Inorg. Chem., 59 (23): 16913-16923 (Nov 18, 2020)PMID: 33205960.
DOI: 10.1021/acs.inorgchem.0c01817

Abstract

We present a systematic study of the evolution of structural parameters and electronic correlations as a function of 3d band filling in a single crystal series of BaT$_2$As$_2$ (T = Cr–Cu). The structure trends are discussed in relation to the orbital occupation of the corresponding d elements supported by calculations of the charge density and electron localization function. Analysis of our specific heat data yields the mass enhancement (m*/m$_b$) throughout the series. By combining the structural data with the mass enhancement values, we find that the decrease in m*/mb for n > 5 follows an increase of the crystal field splitting, determined by the progressive distortion of the As–T–As angle from the ideal tetrahedral environment. This study finds a strong interplay between crystal structure, bonding behavior, band filling, and electronic properties.

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