Anomalies in cuprous chloride

Chu, C. W.; Rusakov, A. P.; Huang, Sampson C.; Early, S.; Geballe, T. H.; Huang, Chao‐Yuan

doi:10.1103/physrevb.18.2116

Cited by 148 publications

(27 citation statements)

References 15 publications

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“…An indication for the existence of the phase CuCl-IIa was obtained earlier in optical absorption edge measurements performed at T = 100 K [18]. Resistivity measurements at room temperature probably also yield evidence for the existence of the phase CuCl-IIa [19]. The structure of CuCl-IV has space group Pa " 3 [11] and is a binary analog of the BC8 structure (space group Ia3) of the metastable high-pressure phases Si-III and Ge-IV.…”

Section: Resultsmentioning

confidence: 91%

Raman Scattering in CuCl under Pressure

Ulrich

Gbel²,

Syassen

et al. 1999

phys. stat. sol. (b)

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Section: Resultsmentioning

confidence: 91%

Raman Scattering in CuCl under Pressure

Ulrich

Gbel²,

Syassen

et al. 1999

phys. stat. sol. (b)

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“…Initially Brandt et al [ 11 reported observing diamagnetism that is 80% or greater of ideal in a measurement of CuCl in which CuCl was placed at a pressure of 5 kbar and the temperature of the sample was rapidly changed. More recently Chu et al [2] observed diamagnetism of 7% of ideal in a rather similar measurement. It has been suggested that a reasonable interpretation of these data is that a superconducting phase of CuCl at elevated temperature is being obtained.…”

Section: Introductionmentioning

confidence: 94%

Electronic and transport properties of CuCl

Kunz

Weidman

Collins

2009

Int. J. Quantum Chem.

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In this article we present a set of fully self-consistent studiesof the energy bands' defect and/or impurity levels in CuCI. These studies are performed as a function of lattice constant and uniaxial compression along the (001) direction. The methods employed are the self-consistent Hartree-Fock plus correlation corrections method. Calculations are performed for the normal lattice constant, 3% volume reduction, and 15% volume reduction, and for a 2% reduction in lattice constant along the (001) direction. The defect and/or impurity systems studied include F centers, H-centers, OHcenters, 02-plus anion vacancy centers, and S2-plus anion vacancy centers. We find the upper valence band is largely Cu 3d in origin and that for normal lattice constant the band gap is direct, at r, and is about 4.0 eV. Under uniaxial stress or hydrostatic pressure, a weak indirect gap may be generated of insufficient width to agree with Abrikosov's hypothesis. We find, however, that defects or impurities produce electrons near the conduction band. We speculate about the role of these electrons as they may pertain to recent CuCI experiments.

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“…In fact, according to Phillip's criterion for ionicity 13 , CuCl is just outside the rocksalt stability range. Many properties of CuCl suggest strong anharmonicity: negative thermal expansion 14 , negative Grüneisen parameters 14,15 , unusual and broad Raman peaks [16][17][18] , asymmetric phonon line shapes 19 and a rich phase diagram 20,21 . Slack and Andersson 12 measured κ(P) of CuCl and found very low κ (< 1W/m-K at room temperature (RT)) that decreased with increasing P. This pressure response is unusual, though found in a few other systems 12,[22][23][24] , and was attributed to large negative Grüneisen parameters of transverse acoustic (TA) modes.…”

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confidence: 99%