{"product_id":"9784431542933","title":"Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements","description":"\u003cp\u003eIn this book the author presents two important findings revealed by high-precision magnetic penetration depth measurements in iron-based superconductors which exhibit high-transition temperature superconductivity up to 55 K: one is the fact that the superconducting gap structure in iron-based 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 iron-based superconductors.\u003c\/p\u003e\u003cp\u003eThe 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 iron-based superconductors by comparing the gap structure obtained from the penetration depth measurements with theoretical predictions, indicating that the non-universal superconducting gap structure in iron-pnictides can be interpreted in the framework of \u003ci\u003eA\u003c\/i\u003e\u003csub\u003e1g\u003c\/sub\u003e symmetry. This result imposes a strong constraint on the pairing mechanism of iron-based superconductors.\u003c\/p\u003e\u003cp\u003eThe author also shows clear evidence for the quantum criticality inside the superconducting dome from the absolute zero-temperature 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 second-order 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.\u003c\/p\u003e\u003cp\u003e\u003c\/p\u003e","brand":"Springer Japan","offers":[{"title":"Default Title","offer_id":47041923612912,"sku":"9784431542933","price":129.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9784431542933_p0.jpg?v=1763713004","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9784431542933","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}