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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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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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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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Strain-induced multigap superconductivity in electrene Mo2N: a first principles study.

Zenner S Pereira1, Giovani M Faccin2, E Z da Silva3

  • 1Departamento de Ciência e Tecnologia, Universidade Federal Rural do Semi-Árido (UFERSA), CEP 59780-000, Campus Caraúbas, RN, Brazil. zenner.silva@ufersa.edu.br.

Nanoscale
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Researchers discovered that a single layer of molybdenum nitride (Mo2N) exhibits high-temperature superconductivity, reaching a transition temperature of 24.7 K. Applying strain further enhances this superconductivity by opening new coupling channels.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Chemistry

Background:

  • Superconductivity in low-dimensional materials and 2D electrides is crucial for next-generation electronics.
  • Understanding electron-phonon coupling and strain effects is key to discovering new superconductors.

Purpose of the Study:

  • To investigate the impact of biaxial strain on superconductivity in a monolayer of Mo2N.
  • To explore the potential of 2D Mo2N as a high-performance superconducting material.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Migdal-Eliashberg formalism.
  • Maximally localized Wannier functions.

Main Results:

  • Monolayer Mo2N exhibits strong, anisotropic electron-phonon coupling and superconductivity.
  • Calculated critical temperature (Tc) of 24.7 K at ambient pressure, a record for this material class.
  • Biaxial strain induces a new superconducting gap and enhances coupling.

Conclusions:

  • 2D Mo2N is a promising high-Tc superconductor with electride characteristics.
  • Strain engineering offers a viable pathway to tune and enhance superconductivity in Mo2N monolayers.