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Significance Heavy fermion superconductor CeCoIn5 shows no structural or magnetic phase transition. By substituting a tiny amount of Zn for In, it is possible to tune magnetism and superconductivity, and… Click to show full abstract
Significance Heavy fermion superconductor CeCoIn5 shows no structural or magnetic phase transition. By substituting a tiny amount of Zn for In, it is possible to tune magnetism and superconductivity, and CeCo(In1 − xZnx)5 is an ideal system for investigation of quantum criticality. Here, we report the second-order magnetic phase transition at the quantum critical point (QCP) inside the superconducting dome in CeCo(In1 − xZnx)5. The QCP is considered a singular point that involves a divergence of the renormalized effective mass of the electrons, and such a feature is confirmed by the observation of the enhanced magnetic penetration depth of the superconductivity toward the QCP. Present results demonstrate that quantum criticality survives inside the superconducting dome and strongly affects the superconducting state.
Journal Title: Proceedings of the National Academy of Sciences of the United States of America
Year Published: 2022
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