High Pressure Compressibility of Cuprous Chloride Crystals

Rusakov, A. P.; Laukhin, V. N.; Lisovskii, Yu. A.

doi:10.1002/pssb.2220710263

Physica Status Solidi (b)

1975

DOI: 10.1002/pssb.2220710263

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High Pressure Compressibility of Cuprous Chloride Crystals

A. P. Rusakov

V. N. Laukhin

Yu. A. Lisovskii

Abstract: b) 71, K191 (1975) Subject classification: 1.2; 22.5 Moscow Institute of Steel and Alloys (a) and Institute of Chemical Physics,Academy of Sciences of the USSR (b), Moscow High Pressure Compressibility of Cuprous Chloride Crystals BY A. P. RUSAKOV (a), V . N . LAUKHIN (b), and YU.A. LISOVSKII (a) In honour of Prof. Dr. Dr. h.c. P. GORLICH's 70th birthday Recently X-ray diffraction and electroresistivity measurements of the ionic dielectric CuCl were taken a t high pressures P up to 130 kbar (1, 2). At room tem… Show more

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1981

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Cited by 14 publications

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On the energy band structure and the phase transitions in a cuprous chloride crystal

Rusakov

1975

Physica Status Solidi (b)

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To explain the break-down of the Lyddane-Sachs-Teller (LST) relation and the compressibility anomaly for CuCl a new energy band model is proposed to include a small indirect gap comparable t o the binding energy of direct excitons. It is found for such a model t h a t the condensation of excitons can result in the break-down of the LST relation as well as a number of other anomalies of properties, i.e. CuCl is a high-temperature excitonic dielectric with an effective mass ratio mh/m, = lo2 of electrons and holes. It is also shown that high pressure can induce a possible excitonic dielectric-superconductor phase transition.

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On the energy band structure and the phase transitions in a cuprous chloride crystal

Rusakov

1975

Physica Status Solidi (b)

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Self‐Consistent Band Structure Calculation of CuCl

Borzunov

Kadyshevich

Rusakov

1981

Physica Status Solidi (b)

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In /1/ it was reported that some CuCl samples rapidly quenched from the molten state down to 77 K have superdiamagnetic properties at temperatures 120 to 230 K. As emphasized a disordered structure of such samples was essential for diamagnetism. The superdiamagnetic properties mentioned in /2 to 6/ were also observed on quenched CuCl samples. It is known from structural r e s e a r c h /7/ that while heating CuCl disorder in the copper atom sublattice takes place. At high temperatures Frenkel defects are formed when a copper atom transforms from a tetrahedral position to an octahedral one of the f. c . c. chlorine sublattice leaving.'a positively chalged vacancy in a tetrahedral position. According to the estimations of /?/, about 30% of copper atoms are transformed into octahedral s i t e s on heating up to 670 K. Thus quenched disordered crystals in /1/ may possess a great concentration of copper atoms in octahedral positions. This state is metastable and after annealing even at room temperature the anomalies disappear /1 to 6/. If the disordering is really essential to superdiamagnetism of CuC1, then for analysing the nature of diamagnetic anomalies, a study of the influence on the electron spectra of the copper atom redistribution between tetraand octa-positions in a crystal lattice is necessary. The aim of our work was an approximate solution of this problem.The calculation was made by the self-consistent model Hamiltonian method, which is the formulation of the KKR method in the mixed b a s i s representation / 8 / , A detailed description of the self-consistency procedure was given by one of us e a r l i e r /9/. First, for comparison, the band structure of a CuCl c q f s t a l without defects was calculated in which all. copper atoms were in proper t e t r a -

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Volume compression of CuCl to 7 GPa

Devi

Singh

1981

Pramana - J. Phys

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High Pressure Compressibility of Cuprous Chloride Crystals

Cited by 14 publications

References 3 publications

On the energy band structure and the phase transitions in a cuprous chloride crystal

On the energy band structure and the phase transitions in a cuprous chloride crystal

Self‐Consistent Band Structure Calculation of CuCl

Volume compression of CuCl to 7 GPa

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