Volume 88, Number 4, November 2009
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 December 2009|
Superconductivity at 31 K in the “111”-type iron arsenide superconductor NaFeAs induced by pressure
Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
2 LANSCE, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
3 HPCAT, Geophysical Laboratory, Carnegie Institution of Washington - Argonne, IL 60439, USA
Corresponding author: Jin@aphy.iphy.ac.cn
Accepted: 2 November 2009
The effect of pressure on the superconductivity of “111”-type NaFeAs is investigated through temperature-dependent electrical-resistance measurements in a diamond anvil cell. The superconducting transition temperature increases from 26 K to a maximum of 31 K as the pressure increases from ambient pressure to 3 GPa. Further increasing pressure suppresses Tc drastically. The behavior of pressure-tuned Tc in NaFeAs is much different from that in LixFeAs, although they have the same Cu2Sb-type structure.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.62.Fj – Pressure effects / 74.25.Dw – Superconductivity phase diagrams
© EPLA, 2009
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