Observation of pressure induced charge density wave order and eightfold structure in bulk VSe2

Guo, Zhiying; Hao, Xingyu; Dong, Juncai; Li, Haijing; Liao, Jiangwen; Chen, Dongliang

doi:10.1038/s41598-021-97630-8

Cited by 6 publications

(2 citation statements)

References 56 publications

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“…At this pressure, 1T -VSe 2 undergoes a first-order phase transition to a new C2/m phase, which destroys the charge order and allows SC to emerge [45]. Furthermore, high-pressure Raman [94], x-ray diffraction, and spectroscopic experiments [50] confirmed the transition to the C2/m phase proceeds at RT, similar to the 1T '-structures of ditellurides (Nb,Ta)Te 2 [95].…”

Section: E Pressure Dependence Of the Soft Mode At Rtmentioning

confidence: 58%

“…In addition to the collapse of the low-energy phonon mode at q CDW and T CDW , the longitudinal and transverse acoustic branches also undergo weak phonon anomalies, highlighting the 3D nature of the charge correlations. Furthermore, the critical phonon does not soften as one heads towards the RT high-pressure transition, indicating that the transition from P3m1 to the C2/m symmetry [50] is of first-order type. We explain how the phonon anomalies of VSe 2 are well captured when anharmonic effects are included in the calculations with an appropriate inclusion of vdW forces.…”

Section: Introductionmentioning

confidence: 97%

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Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Diego,

Subires,

Said

et al. 2024

Phys. Rev. B

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Section: E Pressure Dependence Of the Soft Mode At Rtmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 97%

Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Diego,

Subires,

Said

et al. 2024

Phys. Rev. B

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Pressure‐Induced Re‐Entrant Superconductivity in Transition Metal Dichalcogenide TiSe₂

Xia,

Wu,

Xia

et al. 2024

Small

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Transition metal dichalcogenide TiSe2 exhibits a superconducting dome within a low pressure range of 2–4 GPa, which peaks with the maximal transition temperature Tc of ≈1.8 K. Here it is reported that applying high pressure induces a new superconducting state in TiSe2, which starts at ≈16 GPa with a substantially higher Tc that reaches 5.6 K at ≈21.5 GPa with no sign of decline. Combining high‐throughput first‐principles structure search, X‐ray diffraction, and Raman spectroscopy measurements up to 30 GPa, It is found that TiSe2 undergoes a first‐order structural transition from the 1T phase under ambient pressure to a new 4O phase under high pressure. Comparative ab initio calculations reveal that while the conventional phonon‐mediated pairing mechanism may account for the superconductivity observed in 1T‐TiSe2 under low pressure, the electron‐phonon coupling of 4O‐TiSe2 is too weak to induce a superconducting state whose transition temperature is as high as 5.6 K under high pressure. The new superconducting state found in pressurized TiSe2 requires further study on its underlying mechanism.

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Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

Shi,

Xie,

Cai

et al. 2023

Plasma Chem Plasma Process

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Dielectric barrier discharge (DBD), a non-thermal plasma(NTP)technology, has a wide range of environmental applications. In this study, TiO 2 , SiO 2 , and Al 2 O 3 were coated on the surface of a quartz dielectric using a dip-coating method. The catalyst coating coatings effectively improved the local discharge intensity, thus enhancing the generation of reactive species. After discharge by the DBD system, the O atom in the middle of TiO 2 crystal is replaced by N atom doping, and the Al = O and Al OH groups on the surface of Al 2 O 3 increase. All Catalyst coating surfaces contained a small number of hydroxyl groups. TiO 2 and Al 2 O 3 surfaces had fewer oxygen vacancies. thus making O 3 synthesis dominant at the gas-solid interface.1 Introduction Dielectric barrier discharge (DBD) is a non-equilibrium gas discharge generated by placing a dielectric barrier between two electrodes. The dielectric material can be coated on the electrode surfaces or suspended within the discharge space. DBD is a reliable and cost-effective method for generating nonthermal plasma (NTP). It can be operated over a wide range of voltage frequencies (from 50 Hz to 1 MHz, alternating current) and gas pressures (from 10 4 Pa to 10 6 Pa). As a result, DBD has a wide range of applications in various elds, including material modi cation, wastewater treatment, medical treatments, and industrial production [1][2][3] . Studies have demonstrated that the synthesis of ozone in the generator can be effectively enhanced by coupling DBD with catalysts [4,5] .One of the main methods of coupling DBD with catalysts is by lling the discharge region of the DBD generator with spherical or irregularly shaped dielectric particles, forming a packed-bed dielectric barrier discharge (PB-DBD) [6][7][8] . Hafeez et al. [9]investigated a novel corona PB-DBD generator by lling the discharge region with dielectric glass beads and compared its ozone synthesis performance with an empty-bed generator. The results showed that the packed-bed plasma generator increases ozone production by approximately 24% under optimized conditions compared with the empty-bed generator. J.Wang et al. [10] lled the generator with metal oxide powders as catalysts and study the effects of catalyst powders on O 3 synthesis and decomposition.. The results showed that FeO, CuO, and ZnO can effectively promote O 3 synthesis whereas MnO 2 and Fe 2 O 3 promoted ozone decomposition rather than synthesis. Meng Li et al. [11] integrated ZnO powder into a hybrid discharge (HD) reactor to investigate the effect of ZnO powder surface reaction on ozone synthesis. The results show that the use of ZnO powder for the optimal conditions with a discharge power of 0.4-3.3 W leads to an average increase of 28% and 26% in O 3 concentration and HD yield, respectively, and the enhanced O 3 synthesis in HD-ZnO is mainly attributed to the strong surface reaction catalyzed by the coating in the O2 plasma. S. Said et al. [12] lled alumina particles into the generator to study the reaction mechanism of ozone synthes...

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Observation of pressure induced charge density wave order and eightfold structure in bulk VSe2

Cited by 6 publications

References 56 publications

Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Pressure‐Induced Re‐Entrant Superconductivity in Transition Metal Dichalcogenide TiSe₂

Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

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Observation of pressure induced charge density wave order and eightfold structure in bulk VSe2

Cited by 6 publications

References 56 publications

Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Electronic structure and lattice dynamics of 1T−VSe2 : Origin of the three-dimensional charge density wave

Pressure‐Induced Re‐Entrant Superconductivity in Transition Metal Dichalcogenide TiSe2

Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

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Pressure‐Induced Re‐Entrant Superconductivity in Transition Metal Dichalcogenide TiSe₂