Observation of pseudogap in MgB2

Journal of Physics. Condensed Matter : an Institute of Physics Journal
S PatilKalobaran Maiti

Abstract

We investigate the electronic structure of a specially prepared highly dense conventional high temperature superconductor, MgB2, employing high resolution photoemission spectroscopy. The spectral evolution close to the Fermi energy is commensurate to BCS descriptions as expected. However, the spectra in the wider energy range reveal the emergence of a pseudogap much above the superconducting transition temperature indicating an apparent departure from the BCS scenario. The energy scale of the pseudogap is comparable to the energy of the [Formula: see text] phonon mode responsible for superconductivity in MgB2 and the pseudogap can be attributed to the effect of electron-phonon coupling on the electronic structure. These results reveal a scenario of the emergence of the superconducting gap within an electron-phonon coupling induced pseudogap and have significant implications in the study of high temperature superconductors.

References

Mar 10, 2001·Nature·J NagamatsuJ Akimitsu
Apr 6, 2001·Physical Review Letters·S L Bud'koP C Canfield
Jun 1, 2001·Physical Review Letters·T TakahashiJ Akimitsu
Jul 20, 2001·Physical Review Letters·R OsbornD G Hinks
Aug 16, 2002·Nature·Hyoung Joon ChoiSteven G Louie
Oct 4, 2003·Physical Review Letters·S TsudaS Shin
Feb 3, 2004·Physical Review Letters·Philippe Curty, Hans Beck
Aug 11, 2005·Physical Review Letters·Kalobaran MaitiE V Sampathkumaran
Jan 27, 2011·Nature Communications·Benjamin SacépéMarc Sanquer
Nov 28, 2013·Scientific Reports·Sangeeta ThakurKalobaran Maiti

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