Title
NonUniversal Superconducting Gap Structure in IronPnictides Revealed by Magnetic Penetration Depth Measurements (Springer Thes,Used
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In this book the author presents two important findings revealed by highprecision magnetic penetration depth measurements in ironbased superconductors which exhibit hightransition temperature superconductivity up to 55 K: one is the fact that the superconducting gap structure in ironbased superconductors depends on a detailed electronic structure of individual materials, and the other is the first strong evidence for the presence of a quantum critical point (QCP) beneath the superconducting dome of ironbased superconductors.The magnetic penetration depth is a powerful probe to elucidate the superconducting gap structure which is intimately related to the pairing mechanism of superconductivity. The author discusses the possible gap structure of individual ironbased superconductors by comparing the gap structure obtained from the penetration depth measurements with theoretical predictions, indicating that the nonuniversal superconducting gap structure in ironpnictides can be interpreted in the framework of A1g symmetry. This result imposes a strong constraint on the pairing mechanism of ironbased superconductors.The author also shows clear evidence for the quantum criticality inside the superconducting dome from the absolute zerotemperature penetration depth measurements as a function of chemical composition. A sharp peak of the penetration depth at a certain composition demonstrates pronounced quantum fluctuations associated with the QCP, which separates two distinct superconducting phases. This gives the first convincing signature of a secondorder quantum phase transition deep inside the superconducting dome, which may address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.
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