The electrical properties of ZnTe under high pressure and moderate temperature

Cui, Xiaoyan; Hu, Tingjing; Yang, Jie; Han, Yonghao; Liu, Cailong; Wang, Yue; Liu, Bao; Ren, Wanbin; Su, Ningning; Liu, Hongwu; Chen, Gao

doi:10.1002/pssc.201000609

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…Thus, one can expect that superconductivity is the general nature of the high-pressure rocksalt and Cmcm phases of the MCT compounds. Moreover, similar to the behaviors of MCT compounds, numerous compounds within the group II−VI family, such as ZnTe, 50,51 HgS/HgTeS, 52 and ZnCdTe, 22 have been shown to be metallic at high pressures. The group II−VI compounds thus also offer a pool for finding new superconductors.…”

Section: H H H Hmentioning

confidence: 81%

Discovery of Superconductivity in Mercury Cadmium Telluride

et al. 2021

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Mercury cadmium telluride compounds exhibit large tunability of nontrivial electronic states by modifying chemical composition, temperature, or pressure. Despite the growing interest in Hg 1−x Cd x Te, very little information currently exists on how their electrical properties are affected upon compression. Here, we systematically investigate the high-pressure behaviors of bulk Au-doped Hg 0.781 Cd 0.219 Te crystals with the doping level close to the Kane fermion point. A clear structure evolution path of this compound with pressure varying from zinc blende (F43̅ m) through cinnabar (P3 1 21) and rocksalt (Fm3̅ m) to the orthorhombic one (Cmcm) is established from the measurements of phonon spectra, resistivity, and the Hall effect. Pressureinduced phonon softening is proposed to be the driving force for the phase transition. The last two phases are found to exhibit superconductivity with different pressure dependence of the critical temperature. These results and findings suggest that superconductivity is the general nature of mercury cadmium tellurium compounds at high pressures. The group II−VI compounds thus also offer a pool for finding new superconductors.

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Section: H H H Hmentioning

confidence: 81%

Discovery of Superconductivity in Mercury Cadmium Telluride

et al. 2021

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“…An alumina buffer rod cell assembly was used for ultrasonic velocity measurements at high pressure [20,21], in which the buffer rod was measured to be 2.43 mm long by 3.27 mm diameter and had a density of 3.946 g cm −3 (98.9% of theoretical density). Pressure was determined resistively (Bi [22], ZnTe [23], and ZnS [24]) and cross-checked using measured alumina travel times [21]. Specific details of the ultrasonic velocity measurements in a multi-anvil apparatus are presented elsewhere [20,21].…”

Section: Experiments Detailsmentioning

confidence: 99%

Sound velocities of PbTe to 14 GPa: evidence for coupling between acoustic and optic phonons

Jacobsen

Liu

2013

J. Phys.: Condens. Matter

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Sound velocities of PbTe have been determined to 14 GPa using an ultrasonic interferometric method, which allowed for a detailed investigation of the characteristic variations of P and S wave velocities across the phase transitions from Fm3¯m (B1) to the orthorhombic Pbnm to Pm3¯m (B2). Elastic bulk and shear moduli and their pressure derivatives have been determined by fitting the measured velocities using a finite-strain approach. Based on the measured velocities and Debye theory, an estimate is made of the acoustic phonon contribution to the thermal conductivity, considering inter-phonon interactions only. By combining this result with previous determinations of the thermal conductivity due to electrons, the combination was found to have a significantly lower value than the previously determined total thermal conductivity. This is interpreted as evidence for coupling between the low-lying transverse optic (TO) and longitudinal acoustic (LA) modes, allowing the transfer of thermal energy from the acoustic to the optic modes. Possible explanations are discussed in the paper.

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“…Due to the possibility of a sudden change in atom arrangement under applied pressure, the characteristics of high-pressure phases may differ significantly from those under normal conditions [9]. The effect of pressure on the electronic, optical, mechanical properties, phonon frequencies, and sound velocity of the semiconductor alloys has been studied by several authors [10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of pressure and composition on electronic properties, phonon frequencies, and sound velocity for the zinc-blende GaAs1-xNx alloy

Maaitah

Elkenany

2022

J Comput Electron

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We investigated the electronic, phonon frequencies, and sound velocity of GaAs1-xNx ternary semiconductor alloys with the zinc-blende crystal structure over the entire nitrogen concentration range (with x from 0 to 1) using the empirical pseudo-potential model within the virtual crystal approximation including the compositional disorder effect. The pressure-dependent electronic, phonon frequencies and sound velocity of GaAs1-xNx ternary alloy have been studied. Our findings and the existing experimental data are found to be in good agreement. According to the dependence on pressure, a rising bandgap is predicted for GaAs1-xNx alloys at high-pressure values. According to the findings of this study, the GaAs1-xNx characteristics could have substantial optoelectronic applications in the infrared and mid-infrared spectral ranges.

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The electrical properties of ZnTe under high pressure and moderate temperature

Cited by 12 publications

References 16 publications

Discovery of Superconductivity in Mercury Cadmium Telluride

Discovery of Superconductivity in Mercury Cadmium Telluride

Sound velocities of PbTe to 14 GPa: evidence for coupling between acoustic and optic phonons

Influence of pressure and composition on electronic properties, phonon frequencies, and sound velocity for the zinc-blende GaAs1-xNx alloy

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