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Superconductors

  • Context

    New Material: LK-99

    • Researchers: South Korea
    • Properties: Superconducts at room temperatures.
    • Synthesis: Baking process combining lanarkite and copper phosphide.
    • Characteristics: Exhibits superconductivity at normal air pressure & temperatures up to 127°C.

  • Definition

    Superconductor:

    Offers near-zero resistance to electric current

    Allows electric current to flow without any loss due to resistance

  • First Superconductor

    Mercury: Exhibits superconductivity at approximately -270°C

  • Key Concepts

    1. Diamagnetism

      Diamagnetism is a fundamental property of all materials, and it refers to the ability of a material to oppose an applied magnetic field

    2. Barden Cooper Schrieffer Pair

      Explains that superconductors are diamagnetic, meaning they exhibit a strong repulsion of magnetic fields from their interior

    3. Meissner Effect

      Related to the expulsion of a magnetic field from the interior of a superconductor during the transition into the superconducting stage

      Results in trapping a magnetic field within its interior and prevents external fields from penetrating the material

  • Critical Temperature

    1. The temperature at which materials exhibit superconducting behavior
    2. Above this temperature, materials return to their normal state
    3. Tc varies from Material to Material. Example Tc of LK 99 was 127 Degree Celsius

  • Applications

    1. MRI

      Utilizes superconductors to create strong magnetic fields to align hydrogen atoms

      Often involves the use of cooled helium. Polarises protons in water molecules

    2. Tokamak Reactors

      Employs superconductors to control plasma (controlling the confinement and shape of the plasma using magnetic fields) in fusion reactors

    3. Particle Accelerators

      Applies superconductors to provide acceleration and control the direction of particle beams

    4. Maglev Trains

      Leverages superconductors for magnetic levitation and propulsion of trains

  • Importance

    Current Limitation: No superconductors operate at room temperature and ambient pressure (LK-99 is a notable exception if validated)

    Potential Impact: Breakthroughs in superconductor technology have broad applications in medical, energy, and transportation sectors due to efficient energy transfer capabilities.