Author(s): Yusuke Iguchi, Kaede Inoh, Ryosuke Koizumi, and Makoto Yokoyama We demonstrate a magnetic quantum critical point embedded within the superconducting state of Zn-doped ${\mathrm{CeCoIn}}_{5}$, revealed by a pronounced peak in the magnetic penetration depth at zero temperature $λ(0)$. Using scanning superconducting quantum interference device microscopy, we determ… [Phys. Rev. Lett. 137, 096001] Published Wed Aug 26, 2026