Electronic Resource

Non-universal superconducting gap structure in iron-pnictides revealed by magnetic penetration depth measurements

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In 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.

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 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 A1g symmetry. This result imposes a strong constraint on the pairing mechanism of iron-based superconductors.

The 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, whichmay address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.

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Ketersediaan

Informasi Detail

Judul Seri

Springer Theses

No. Panggil

E1798

Penerbit

Tokyo : Springer Tokyo., 2013

Deskripsi Fisik

xiii, 125 hlm.

Bahasa

English

ISBN/ISSN

9784431542940

Klasifikasi

NONE

Tipe Isi

text

Tipe Media

computer

Tipe Pembawa

online resource

Edisi

-

Subjek

Superkonduktivitas : Magnet
Fisika Kuantum
Benda Magnetis

Info Detail Spesifik

-

Pernyataan Tanggungjawab

Kenichiro Hashimoto

Versi lain/terkait

Lampiran Berkas

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