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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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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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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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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 Diagram01:19

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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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Superconductivity in o-MAX phases.

Mohammad Keivanloo1, Mohammad Sandoghchi1, Mohammad Reza Mohammadizadeh2

  • 1Department of Physics, University of Tehran, North Kargar Ave, Tehran 14395547, Iran. mohammad.khazaei@ut.ac.ir.

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Summary
This summary is machine-generated.

This study explores superconducting properties in novel MAX phases, identifying 16 new superconductors. Four compounds show critical temperatures over 10 K, with one predicted at 17.9 K, offering new avenues for advanced materials.

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Area of Science:

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

Background:

  • MAX phases and MXenes are materials with diverse applications.
  • Understanding superconductivity in these phases is crucial for technological advancement.

Purpose of the Study:

  • Investigate geometrical structures, electronic properties, and superconductivity in 27 out-of-plane ordered double transition metal carbides (o-MAX phases).
  • Identify novel superconducting o-MAX phases and analyze mechanisms driving superconductivity.

Main Methods:

  • Employed first-principles calculations to study structural, electronic, and phonon properties.
  • Analyzed dynamic stability, electron-phonon coupling (EPC), and superconducting critical temperatures (Tc).

Main Results:

  • Identified 16 superconducting o-MAX phases.
  • Four compounds (W2VAlC2, W2NbAlC2, W2TaAlC2, Mo2NbAlC2) exhibit Tc > 10 K, with W2VAlC2 predicted at 17.9 K.
  • Kohn anomalies in low-frequency modes enhance electron-phonon interactions, boosting Tc.

Conclusions:

  • Discovered record-high superconducting transition temperatures in o-MAX phases.
  • Established a link between Kohn anomalies, electron-phonon coupling, and superconductivity.
  • Nb2M'AlC2 compounds were found to be non-superconducting.