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Related Concept Videos

Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Diagram01:19

Phase Diagram

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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Phase Changes01:19

Phase Changes

5.5K
Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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States of Matter and Phase Changes00:59

States of Matter and Phase Changes

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The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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Pressure-Induced Phase Transition in Weyl Semimetallic WTe2.

Juan Xia1, Dong-Fei Li2, Jia-Dong Zhou3

  • 1Division of Physics and Applied Physics School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Small (Weinheim an Der Bergstrasse, Germany)
|August 29, 2017
PubMed
Summary

Tungsten ditelluride (WTe2) single crystals undergo a structural phase transition under pressure, losing their Weyl semimetal states. This transition to a monoclinic phase also enables superconductivity in the material.

Keywords:
Raman spectroscopyfirst-principles calculationshigh pressurephase transitiontungsten ditelluride

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Tungsten ditelluride (WTe2) is a semimetal exhibiting unique properties like Weyl semimetal states, pressure-induced superconductivity, and giant magnetoresistance.
  • The orthorhombic Td phase of WTe2 is known for its distinct electronic and vibrational characteristics.

Purpose of the Study:

  • Investigate the high-pressure behavior of WTe2 single crystals.
  • Understand the structural and electronic phase transitions under pressure.
  • Explore the relationship between structural changes, Weyl states, and superconductivity.

Main Methods:

  • High-pressure Raman microspectroscopy was employed to probe vibrational properties.
  • Ab initio calculations were performed to understand the electronic structure and phase stability.
  • Analysis of Raman peak shifts and vibrational anisotropy provided insights into structural changes.

Main Results:

  • WTe2 single crystals exhibit significant plane-parallel/plane-vertical vibrational anisotropy.
  • Raman peaks show a redshift under pressure, indicating structural instability of the Td phase.
  • A phase transition from orthorhombic Td to monoclinic T' occurs at approximately 8 GPa.

Conclusions:

  • The Td to T' phase transition in WTe2 leads to the vanishing of Weyl states due to the introduction of inversion symmetry.
  • This pressure-induced transition offers a method for switching Weyl states without material doping.
  • The emergence of the T' phase correlates with the onset of superconductivity in WTe2.