Journal ArticleDOI
Absence of low energy magnetic spin-fluctuations in isovalently and aliovalently doped LaCo2B2 superconducting compounds.
TLDR
The site selective NMR experiment reveals the multiband nature of the Fermi surface in these systems and indicates the absence of correlated low energy magnetic spin-fluctuations in the normal state, which is in contrast to other Fe-based pnictides.Abstract:
Magnetization, resistivity and (11)B, (59)Co NMR measurements have been performed on the Pauli paramagnet [Formula: see text], and the superconductors [Formula: see text] ([Formula: see text] K) and [Formula: see text] ([Formula: see text] K). The site selective NMR experiment reveals the multiband nature of the Fermi surface in these systems. The temperature independent Knight shift and 1/T 1 T clearly indicate the absence of correlated low energy magnetic spin-fluctuations in the normal state, which is in contrast to other Fe-based pnictides. The density of states (DOS) of Co 3d electrons has been enhanced in superconducting [Formula: see text] and [Formula: see text] with respect to the non superconducting reference compound [Formula: see text]. The occurrence of superconductivity is related to the DOS enhancement.read more
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Journal ArticleDOI
Recent advances in magnetic structure determination by neutron powder diffraction
TL;DR: In this article, the main formulas governing the analysis of the Bragg magnetic scattering are summarized and shortly discussed and the method of profile fitting without a structural model to get precise integrated intensities and refine the propagation vector(s) of the magnetic structure is discussed.
Journal ArticleDOI
Pairing symmetry in cuprate superconductors
C. C. Tsuei,John R. Kirtley +1 more
TL;DR: The recent development of phase-sensitive tests, combined with the refinement of several other symmetry-sensitive techniques, has for the most part settled this controversy in favor of predominantly $d$-wave symmetry for a number of optimally hole-and electron-doped cuprates as mentioned in this paper.
Journal ArticleDOI
The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
TL;DR: The response of the worldwide scientific community to the discovery in 2008 of superconductivity at T c'='26'K in the Fe-based compound LaFeAsO1−x F x has been very enthusiastic.
Journal ArticleDOI
Structural and magnetic phase diagram of CeFeAsO 1− x F x and its relation to high-temperature superconductivity
Jun Zhao,Qingzhen Huang,Clarina Dela Cruz,Clarina Dela Cruz,Shiliang Li,J. W. Lynn,Yuanzhen Chen,Yuanzhen Chen,Mark Green,Mark Green,G. F. Chen,Gang Li,Zheng-Cai Li,J. L. Luo,Nan Wang,Pengcheng Dai,Pengcheng Dai +16 more
TL;DR: Comparison of the structural evolution of CeFeAsO(1-x)F(x) with other Fe-based superconductors suggests that the structural perfection of the Fe-As tetrahedron is important for the high-Tc superconductivity in these Fe pnictides.
Journal ArticleDOI
Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln = La, Nd)
Chul-Ho Lee,Akira Iyo,Hiroshi Eisaki,Hijiri Kito,M. T. Fernandez-Diaz,Toshimitsu Ito,Kunihiro Kihou,Hirofumi Matsuhata,Markus Braden,Kazuyoshi Yamada +9 more
TL;DR: In this article, the superconducting phase diagram of NdFeAsO 1- y was established as a function of oxygen content, which was determined by Rietveld refinement.