Valence transition theory of the pressure-induced dimensionality crossover in superconducting 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>14</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>24</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>41</mml:mn></mml:msub></mml:mrow></mml:math>

Song, Jeong-Pil; Clay, R. Torsten; Mazumdar, Sumit

doi:10.1103/physrevb.108.134510

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.134510

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Valence transition theory of the pressure-induced dimensionality crossover in superconducting Sr14−xCaxCu24O41

Jeong-Pil Song,

R. Torsten Clay,

Sumit Mazumdar

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2024

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Cited by 2 publications

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Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice

Cheng,

Bai,

Ruan

et al. 2024

J. Am. Chem. Soc.

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Unconventional superconductivity in bulk materials under ambient pressure is extremely rare among the 3d transition metal compounds outside the layered cuprates and iron-based family. It is predominantly linked to highly anisotropic electronic properties and quasi-two-dimensional (2D) Fermi surfaces. To date, the only known example of a Co-based exotic superconductor is the hydrated layered cobaltate, Na x CoO 2 •yH 2 O, and its superconductivity is realized in the vicinity of a spin-1/2 Mott state. However, the nature of the superconductivity in these materials is still a subject of intense debate, and therefore, finding a new class of superconductors will help unravel the mysteries of their unconventional superconductivity. Here, we report the discovery of superconductivity at ∼6.3 K in our newly synthesized layered compound Na 2 CoSe 2 O, in which the edge-shared CoSe 6 octahedra form [CoSe 2 ] layers with a perfect triangular lattice of Co ions. It is the first 3d transition metal oxychalcogenide superconductor with distinct structural and chemical characteristics. Despite its relatively low T C , this material exhibits very high superconducting upper critical fields, μ 0 H C2 (0), which far exceeds the Pauli paramagnetic limit by a factor of 3−4. First-principles calculations show that Na 2 CoSe 2 O is a rare example of a negative charge transfer superconductor. This cobalt oxychalcogenide with a geometrical frustration among Co spins shows great potential as a highly appealing candidate for the realization of unconventional and/or high-T C superconductivity beyond the well-established Cu-and Fe-based superconductor families and opens a new field in the physics and chemistry of low-dimensional superconductors.

show abstract

Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice

Cheng,

Bai,

Ruan

et al. 2024

J. Am. Chem. Soc.

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show abstract

Computational demonstrations of density wave of Cooper pairs and paired-electron liquid in the quarter-filled band—A brief review

Mazumdar,

Torsten Clay

2024

Chaos: An Interdisciplinary Journal of Nonlinear Science

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There has been strong interest recently in the so-called Cooper pair density wave, subsequent to the proposition that such a state occurs in the hole-doped cuprate superconductors. As of now, there is no convincing demonstration of such a state in the cuprate theoretical literature. We present here a brief but complete review of our theoretical and computational work on the paired-electron crystal (PEC), which has also been experimentally seen in the insulating phase proximate to superconductivity (SC) in organic charge-transfer solid (CTS) superconductors. Within our theory, SC in the CTS does indeed evolve from the PEC. A crucial requirement for the finding of the PEC is that the proper carrier density of one charge carrier per two sites is taken into consideration at the outset. Following the discussion of CTS superconductors, we briefly discuss how the theory can be extended to understand the phase diagram of the cuprate superconductors that has remained mysterious after nearly four decades of the discovery of SC in this family.

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Valence transition theory of the pressure-induced dimensionality crossover in superconducting Sr14−xCaxCu24O41

Cited by 2 publications

References 79 publications

Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice

Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice

Computational demonstrations of density wave of Cooper pairs and paired-electron liquid in the quarter-filled band—A brief review

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About

Valence transition theory of the pressure-induced dimensionality crossover in superconducting Sr14−xCaxCu24O41

Cited by 2 publications

References 79 publications

Superconductivity in a Layered Cobalt Oxychalcogenide Na2CoSe2O with a Triangular Lattice

Superconductivity in a Layered Cobalt Oxychalcogenide Na2CoSe2O with a Triangular Lattice

Computational demonstrations of density wave of Cooper pairs and paired-electron liquid in the quarter-filled band—A brief review

Contact Info

Product

Resources

About

Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice

Superconductivity in a Layered Cobalt Oxychalcogenide Na₂CoSe₂O with a Triangular Lattice