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Jpn. J. Appl. Phys. 51 (2012) 010004 (13 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Invited Review Paper

Recent Progress in Physics of High-Temperature Superconductors

Takami Tohyama

Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

(Received August 5, 2011; accepted September 7, 2011; published online December 12, 2011)

One hundred years after the discovery of superconductivity, we are now facing a new era that demands an increase in the superconducting transition temperature Tc. In addition to copper-based superconductors, iron-based superconductors that have been discovered recently have been considered high-temperature superconductors. The similarity and difference between the two high-Tc systems are discussed on the basis of our recent theoretical and experimental understandings. While the pairing mechanism and non-Fermi liquid behaviors in transport properties may have a common origin between the two systems, the strengths of electron correlation are different: Cuprate is a doped Mott insulator, while iron pnictide is an itinerant system with a weak correlation. Pseudogap phenomena in hole-doped cuprates and their absence in electron-doped cuprate are regarded as a consequence of a strong correlation. Recent topics in cuprates about electron–hole asymmetry and pseudogap phenomenon are reviewed from a theoretical viewpoint. For iron pnictides, anisotropic behaviors in antiferromagnetic phases and new iron-selenide superconductors are discussed.

URL: http://jjap.jsap.jp/link?JJAP/51/010004/
DOI: 10.1143/JJAP.51.010004


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