Mechanical properties

Munro, R. G.

doi:10.1016/b978-012561460-3/50014-x

Cited by 2 publications

(2 citation statements)

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“…The Bardeen–Cooper–Schrieffer (BCS) theory of superconductivity predicts the critical temperature where θ D is the Debye temperature, U is the electron–lattice interaction energy, and D ( E f ) the electron DOS at the Fermi energy of an electrical conductor. The θ D equals approximately where h , k B , q , N A , V m , G and ρ are, respectively, the Planck’s constant, the Boltzmann’s constant, the number of atoms per molecule, the Avogadro’s number, the molar volume, the shear modulus, and the mass density of the conductor. The shear modulus is related to the bulk modulus ( B ) and the Poisson’s ratio (ν) via …”

Section: Discussionmentioning

confidence: 99%

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling

Feng

Zhang

et al. 2021

J. Am. Chem. Soc.

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Emergent layered Cu-bearing van der Waals (vdW) compounds have great potentials for use in electrocatalysis, lithium batteries, and electronic and optoelectronic devices. However, many of their alluring properties such as potential superconductivity remain unknown. In this work, using CuP2Se as a model compound, we explored its electrical transport and structural evolution at pressures up to ∼60 GPa using both experimental determinations and ab initio calculations. We found that CuP2Se undergoes a semiconductor-to-metal transition at ∼20 GPa at room temperature and a metal-to-superconductor transition at 3.3–5.7 K in the pressure range from 27.0 to 61.4 GPa. At ∼10 and 20 GPa, there are two isostructural changes in the compound, corresponding to, respectively, the emergence of the interlayer coupling and start of interlayer atomic bonding. At a pressure between 35 and 40 GPa, the vdW layers start to slide and then merge, forming a new phase with high coordination numbers. We also found that the Bardeen–Cooper–Schrieffer (BCS) theory describes quite well the pressure dependence of the critical temperature despite occurrence of a possible medium-to-strong electron–phonon coupling, revealing the determinant roles of the enhanced bulk modulus and electron density of states at high pressure. Moreover, nanosizing of CuP2Se at high pressure further increased the critical temperature even at sizes approaching the Anderson limit. These findings would have important implications for developing novel applications of layered vdW compounds through simple pressure tuning of the interlayer coupling.

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Section: Discussionmentioning

confidence: 99%

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling

Feng

Zhang

et al. 2021

J. Am. Chem. Soc.

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“…Fortunately, like other areas of forefront research, the focus of the HTS effort is on the central characteristics of the phenomenon, i. e., the critical temperatures, current densities, and field strengths, along with the structure of the materials. Other properties, particularly the thermal and mechanical properties [5], are studied also but appear more obscurely in the literature. The latter properties, however, are essential to the development of practical applications of the materials.…”

Section: Introductionmentioning

confidence: 99%

NIST materials properties databases for advanced ceramics

Munro

2001

J. Res. Natl. Inst. Stand. Technol.

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The NIST Ceramics Division maintains two databases on the physical, mechanical, thermal, and other properties of high temperature superconductors and structural ceramics. Crystallographic data are featured prominently among the physical property data and serve several important functions in the classification and evaluation of the property values. The scope of materials, properties, and data evaluation protocols are discussed for the two databases.

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Mechanical properties

Cited by 2 publications

References 93 publications

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling

NIST materials properties databases for advanced ceramics

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Mechanical properties

Cited by 2 publications

References 93 publications

Metallization and Superconductivity in the van der Waals Compound CuP2Se through Pressure-Tuning of the Interlayer Coupling

Metallization and Superconductivity in the van der Waals Compound CuP2Se through Pressure-Tuning of the Interlayer Coupling

NIST materials properties databases for advanced ceramics

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Product

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About

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling

Metallization and Superconductivity in the van der Waals Compound CuP₂Se through Pressure-Tuning of the Interlayer Coupling