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Abstract
CuTeO4 has been proposed as a crystallographically distinct, yet electronic structure analog, of the superconducting cuprates. Here, we present a detailed characterization of the physical properties of CuTeO4 to address this proposal. Fitting of magnetic susceptibility data indicates unexpected quasi-one-dimensional, antiferromagnetic correlations at high temperature, with a nearest-neighbor Heisenberg exchange of 1=164(5) K. Low-temperature heat capacity measurements reveal a sizable -linear contribution of =9.58(8) mJ mol−1K−2, qualitatively consistent with expectations for a =1/2, uniform, Heisenberg spin chain. Below ≈40 K, the susceptibility shows an upturn inconsistent with quasi-one-dimensional behavior. While heat capacity measurements show no signs of magnetic order down to low-temperature, the upturn in the magnetic susceptibility coincides with the emergence of a diffuse peak (centered at | ⃗ |≈0.7 Å) in the neutron diffraction data, indicative of persistent, short-range, antiferromagnetic order with a correlation length of =10.1(9) Å at =10 K. The onset of nonlinearity and hysteresis in the isothermal magnetization curves suggests the presence of a small ferromagnetic component. This persistent, short-range order is understood in the context of structural modeling of the x-ray and neutron diffraction data that show the presence of a significant density of stacking faults. No evidence for substantive dopability is observed and CuTeO4 appears, qualitatively, to have a larger band gap than predicted by density functional theory. We ascribe this finding to the inductive withdrawal effect from high-valence Te and suggest that superconductivity in copper tellurates is more likely to be found in compounds with a decreased reductive withdrawal effect from Te.
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Authors (7)
-
Zubia Hasan
- Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
-
Eli Zoghlin
- Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
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Kathryn E. Arpino
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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Thomas Halloran
- Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
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Thao Tran
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634, USA
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Tyrel McQueen
- Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
PHYSICAL REVIEW B
no. 109,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Hasan Z., Zoghlin E., Winiarski M., Arpino K. E., Halloran T., Tran T., McQueen T.: Quasi-one-dimensional exchange interactions and short-range magnetic correlations in CuTeO4// PHYSICAL REVIEW B -Vol. 109,iss. 19 (2024), s.195168-195168
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.109.195168
- Sources of funding:
-
- Free publication
- Verified by:
- Gdańsk University of Technology
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