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Springer Theses

Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements

Authors: Hashimoto, Kenichiro

  • Presents studies on the superconducting gap structure in the recently discovered iron-based superconductors
  • Provides a detailed description of experimental principles and methods for the magnetic penetration measurements including the tunnel diode oscillator and microwave cavity perturbation techniques
  • Investigates the non-universal superconducting gap structure with and without nodes in iron-pnictides
  • Nominated as an outstanding Ph.D thesis by Kyoto University‚Äôs Physics Department in 2011
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About this book

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

About the authors

Dr. Kenichiro Hashimoto

Department of Physics, Kyoto University,
Kyoto, Japan

Table of contents (8 chapters)

  • Introduction

    Hashimoto, Kenichiro

    Pages 1-6

  • Superconducting Gap Structure and Magnetic Penetration Depth

    Hashimoto, Kenichiro

    Pages 7-17

  • Iron-Based Superconductors

    Hashimoto, Kenichiro

    Pages 19-44

  • Experimental Method

    Hashimoto, Kenichiro

    Pages 45-62

  • Superconducting Gap Structure and Quantum Critical Point in $$\mathrm{{BaFe}}_2(\mathrm{{As}}_{1-x}\mathrm{{P}}_x)_2$$

    Hashimoto, Kenichiro

    Pages 63-93

Buy this book

eBook $99.00
price for USA (gross)
  • ISBN 978-4-431-54294-0
  • Digitally watermarked, DRM-free
  • Included format: PDF, EPUB
  • ebooks can be used on all reading devices
  • Immediate eBook download after purchase
Hardcover $129.00
price for USA
  • ISBN 978-4-431-54293-3
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
Rent the ebook  
  • Rental duration: 1 or 6 month
  • low-cost access
  • online reader with highlighting and note-making option
  • can be used across all devices
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Bibliographic Information

Bibliographic Information
Book Title
Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
Authors
Series Title
Springer Theses
Copyright
2013
Publisher
Springer Japan
Copyright Holder
Springer Japan
eBook ISBN
978-4-431-54294-0
DOI
10.1007/978-4-431-54294-0
Hardcover ISBN
978-4-431-54293-3
Series ISSN
2190-5053
Edition Number
1
Number of Pages
XIII, 125
Topics