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Fermi surface dichotomy of superconducting gap and pseudogap in underdoped pnictides | | Y.-M. Xu
; P. Richard
; K. Nakayama
; T. Kawahara
; Y. Sekiba
; T. Qian
; M. Neupane
; S. Souma
; T. Sato
; T. Takahashi
; H. Luo
; H.-H. Wen
; G.-F. Chen
; N.-L. Wang
; Z. Wang
; Z. Fang
; X. Dai
; H. Ding
; | | Date: |
27 May 2009 | | Abstract: | The recent discovery of high temperature superconductivity in many
iron-arsenic (pnictides) materials has brought new excitement to the field of
condensed matter physics. A flurry of research activities on these materials
have quickly yielded many important understandings on the underlying physics of
the pnictides, including a novel antiferromagnetic (AF) phase in the parent
compounds and a Fermi surface (FS) dependent s-wave pairing symmetry in the
optimally doped pnictides. But the essential questions remain as to how the
pnictides evolve from an AF semimetal to a superconductor through carrier
doping and what is the driving force for pairing between the electrons and
superconductivity. By studying the underdoped (UD) pnictides using
angle-resolved photoemission spectroscopy, we found that a distinct pseudogap
develops and coexists with the superconducting (SC) gap at low temperatures.
Remarkably, this pseudogap occurs mainly on the FS sheets that are connected by
the AF wave vector, where the SC pairing is stronger as well. This suggests
that both the pseudogap and the SC gap are driven by the AF fluctuations, and
the AF long-range ordering competes with the superconductivity. The observed
dichotomic behaviour of the pseudogap and the SC gap on different FS sheets in
the UD pnictides shares many similarities with those observed in the UD copper
oxide (cuprate) superconductors, providing a unifying picture for both families
of high temperature superconductors. | | Source: | arXiv, 0905.4467 | | Services: | Forum | Review | PDF | Favorites | |
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