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Related Concept Videos

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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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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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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Probing the Meissner Effect in Microscale Two-Dimensional van der Waals Superconductors.

Kang Wang1, Meng Shi1,2, Qikang Gan3

  • 1Anhui Provincial Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei, Anhui, China.

Advanced Materials (Deerfield Beach, Fla.)
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Dynamic cantilever magnetometry (DCM) now probes the Meissner effect in 2D van der Waals (vdW) superconductors, revealing magnetic signatures crucial for understanding these materials. This technique offers high sensitivity for validating superconductivity in low-dimensional systems.

Keywords:
2D van der Waals superconductorsdynamic cantilever magnetometrysuperconducting screening efficiencythe Meissner effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Devices

Background:

  • Two-dimensional (2D) van der Waals (vdW) superconductors are promising for quantum devices but challenging to study due to small volumes and weak signals.
  • Traditional assessment relies on zero resistance, neglecting the Meissner effect, a key indicator of superconductivity.

Purpose of the Study:

  • To demonstrate dynamic cantilever magnetometry (DCM) as a method for probing the intrinsic Meissner diamagnetism in 2D vdW superconductors.
  • To establish a theoretical model for quantitative extraction of magnetization and susceptibility from DCM measurements.
  • To validate superconductivity in 2D vdW materials through magnetic signatures.

Main Methods:

  • Development of a theoretical model to quantitatively analyze magnetization and susceptibility from DCM data.
  • Application of DCM to 2-methoxy-4-methyl-2,4-dinitro-1,5-pentadiene (2M-WS2) as a model 2D vdW superconductor.
  • Measurement of magnetization hysteresis loops and magnetic susceptibility.

Main Results:

  • A clear magnetization hysteresis loop characteristic of type-II superconductivity was observed in 2M-WS2.
  • Magnetic susceptibility was detected down to 5.7 nm thickness, showing ~89.9% diamagnetic screening efficiency at 4.6 mT.
  • DCM achieved high sensitivity: ~1.1 × 10^-17 A·m² for magnetization and ~9.4 × 10^-17 A·m²/T for susceptibility.

Conclusions:

  • DCM is capable of detecting the Meissner effect in 2D vdW superconductors, providing crucial magnetic validation.
  • The study highlights DCM's potential for characterizing superconductivity in low-dimensional materials.
  • This technique opens new avenues for exploring unconventional superconductivity and developing low-power quantum devices.