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Related Concept Videos

Phase Transitions01:21

Phase Transitions

A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
Phase Transitions02:31

Phase Transitions

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 occupy...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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...
Entropy Changes Accompanying Specific Processes01:21

Entropy Changes Accompanying Specific Processes

Entropy, a measure of disorder in a system, changes during phase transitions like freezing or boiling. At the transition temperature Ttrs, where two phases are in equilibrium, the phase transition is a reversible process. The entropy change can be calculated from a substance's enthalpy of transition using the equation ΔStrs = ΔtrsH /Ttrs.When a perfect gas expands isothermally from one volume to another, entropy increases logarithmically with volume. Conversely, isothermal compression results...
Phase Diagram01:19

Phase Diagram

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).
Phase Diagram01:24

Phase Diagram

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...

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Related Experiment Video

Updated: May 31, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Magneto-elastic phase transitions in one-dimensional systems.

J R Suárez1, E Vallejo, O Navarro

  • 1Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, 04510 México DF, Mexico.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 1, 2011
PubMed
Summary

This study explores magnetism and lattice distortion in 1D systems. It reveals phase transitions and magnetic polarons, leading to Wigner crystallization at higher energies.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Understanding the interplay between magnetism and lattice distortion is crucial for novel electronic materials.
  • One-dimensional (1D) systems offer unique platforms for studying complex emergent phenomena.
  • Magneto-elastic effects govern the behavior of many technologically relevant materials.

Purpose of the Study:

  • To investigate the magneto-elastic phase diagram in 1D systems.
  • To analyze the interplay between magnetism and lattice distortion using a double-exchange and super-exchange model.
  • To determine the behavior of electrons and lattice distortions under varying super-exchange interactions.

Main Methods:

  • Utilizing a theoretical model incorporating classical localized spins and large Hund's coupling.
  • Analyzing a double-exchange and super-exchange model for 1D systems.
  • Calculating lattice distortion and charge distribution within magnetic polarons.

Main Results:

  • At low super-exchange energy, a phase transition occurs between ferromagnetic distorted and antiferromagnetic undistorted phases via phase separation.
  • At higher super-exchange energy, phase separation into independent magnetic polarons within an antiferromagnetic background is observed.
  • These polarons exhibit Wigner crystallization, with calculated lattice distortion and charge distribution.

Conclusions:

  • The study elucidates distinct magneto-elastic phases in 1D systems driven by super-exchange interactions.
  • Magnetic polarons and Wigner crystallization are identified as key phenomena at higher interaction energies.
  • The findings provide insights into the complex behavior of electrons and lattice in magnetic 1D materials.