Volume 86, Number 4, May 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||26 May 2009|
Superfluid density of the ±s-wave state for the iron-based superconductors
Department of Physics, Chonnam National University - Kwangju 500-757, Korea and Asia Pacific Center for Theoretical Physics - Pohang 790-784, Korea
Corresponding author: firstname.lastname@example.org
Accepted: 29 April 2009
We study the superfluid density of the ±s-wave state of the minimal two-band model for the Fe-based superconductors and its evolution with impurity concentration. We show that the impurity scattering of the strong-coupling limit induces the self-energy of a generic form beyond a critical impurity concentration . This form of causes the temperature dependence of the superfluid density . Combined with the full gap behavior of for lower impurity concentration , the ±s-wave state produces a continuous evolution of : exponentially flat with increasing impurity concentration that is consistent with the measurements of the Fe pnictide superconductors such as M-1111 (M = La, Nd, Sm, Pr) and Ba-122 with various dopings, except LaFePO which shows at low temperatures by a recent experiment. Our results also demonstrate that the density of states (DOS) measured by thermodynamic properties and the DOS measured by transport properties can in general be different.
PACS: 74.20.-z – Theories and models of superconducting state / 74.20.Rp – Pairing symmetries (other than s-wave) / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
© EPLA, 2009
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