TUNGSTEN TELLURIDE
TUNGSTEN TELLURIDE
CAS: 12067-76-4
Molecular Formula: Te2W
TUNGSTEN TELLURIDE - Names and Identifiers
TUNGSTEN TELLURIDE - Physico-chemical Properties
| Molecular Formula | Te2W |
| Molar Mass | 439.04 |
| Density | 9.430 |
| Melting Point | 1020°C |
| Appearance | gray orthorhombic crystals |
| Storage Condition | 2-8℃ |
TUNGSTEN TELLURIDE - Introduction
What is tungsten telluride? Tungsten telluride, WTe2, is a transition metal telluride. It is also a two-dimensional layered material with similar characteristics to graphene (so it is sometimes called layered tungsten telluride), like transition metal telluride such as molybdenum telluride (MoTe2), It has attracted widespread attention because of its unique and extraordinary electrical and optical properties. These transition metal dictellurides show great hope for the development of various technologies such as quantum technology, transistors and phase change memory.
WTe2 is the first stripping 2D material known to undergo ferroelectric switching. Before this discovery, scientists only saw ferroelectric switches in electrical insulators. But WTe2 is not an electrical insulator, it is actually a metal, although it is not a very good metal.
Superconductive tungsten telluride (WTe2) is a transition metal chalcogenide compound with a layered structure. In its orthogonal unit cell, the tungsten chain is distributed in one dimension along the-axis direction of the tellurium layer. It is a non-magnetic semi-metallic material. WTe2 has long been known for its good thermoelectric performance. Professor Cava's research group at Princeton University unexpectedly discovered in 2014 that WTe2 has unsaturated large magnetoresistance (LMR) characteristics under normal pressure [Nature, 514 (2014) 205], that is, this material exhibits unusually large positive resistance effect under magnetic field and is unsaturated under very high magnetic field. This characteristic not only provides potential for its application in electronic devices, but also opens up a new direction for the research of large magnetoresistive materials. In semi-metals, the very high magnetoresistance is caused by the "resonance" between holes and electrons, and WTe2 is the first material discovered to have this perfect resonance.
Recently, the Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory of Condensed Matter Physics (in preparation) State Key Laboratory of Superconductivity SC4 Researcher Sun Liling and Ph.D. Kang Defen, Zhou Yazhou, etc., and Shi Yanguo, Associate Researcher of the Institute of Physics, Tsinghua University Professor Zhang Guangming has conducted a systematic and in-depth study on the high-pressure behavior of WTe2, and found that the LMR phenomenon has been continuously suppressed under the action of pressure, it eventually disappears at a pressure of about 10.5GPa, while showing superconductivity. The highest superconducting transition temperature (Tc = 6.5 K) occurs at a pressure of 13 GPa, Tc continuously decreases at a higher pressure, and Tc = 2.6K at 24 GPa. High-pressure in-situ Hall measurements show that the Hall coefficient changes from a positive value to a negative value at a critical pressure when LMR is completely suppressed and superconductivity appears, revealing that a Fermi surface reconstruction has occurred at this critical pressure Quantum phase transition, this type of phase transition can usually be described by Lifshitz phase transition. The high-pressure synchrotron radiation XRD experimental results confirm that WTe2 has no structural phase change below the pressure of 20.1GPa, but the C axis is compressed by 6.5% under the critical pressure. The compression ratio is 10 times of the axis compression ratio and twice of the B axis compression ratio, indicating that the reconstruction of the Fermi surface at this critical pressure point is accompanied by a strong anisotropic lattice reduction.
Superconductivity is often closely related to the ordered state of electrons, and its correlation has always been one of the key research topics in the field of superconductivity. In this study, pressure-induced superconductivity was found for the first time in neighboring LMR states, enriching the research on the correlation between superconducting states and other quantum states. The research results were published in Nature Communications, 6 (2015) 7804.
Last Update：2024-04-10 22:29:15
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Mobile: 18021002903
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