High-temperature superconductivity: Exploring quadratic electron-phonon coupling

Researchers are investigating the potential of quadratic electron-phonon coupling to enhance high-temperature superconductivity. This coupling mechanism, where interaction energy is proportional to the square of phonon displacement, can form “quantum bipolarons.” These bipolarons can exhibit superconductivity at higher critical temperatures than traditional methods. The study suggests that materials with strong quadratic coupling could achieve critical temperatures around 100 Kelvin, offering a new pathway for developing high-temperature superconductors.

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