Evidence of a universal and isotropic 2 ÕkBTC ratio in 122-type iron pnictide superconductors over a wide doping range

نویسندگان

  • Xiaohang Zhang
  • Yoon Seok Oh
  • Yong Liu
  • Liqin Yan
  • Shanta R. Saha
  • Nicholas P. Butch
  • Kevin Kirshenbaum
  • Kee Hoon Kim
  • Johnpierre Paglione
  • Richard L. Greene
  • Ichiro Takeuchi
چکیده

Xiaohang Zhang,1,* Yoon Seok Oh,2 Yong Liu,2 Liqin Yan,2 Shanta R. Saha,1 Nicholas P. Butch,1 Kevin Kirshenbaum,1 Kee Hoon Kim,2 Johnpierre Paglione,1 Richard L. Greene,1 and Ichiro Takeuchi3 1CNAM and Department of Physics, University of Maryland, College Park, Maryland 20742, USA 2CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea 3Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA Received 20 June 2010; published 30 July 2010

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Artificially engineered superlattices of pnictide superconductors.

Significant progress has been achieved in fabricating high-quality bulk and thin-film iron-based superconductors. In particular, artificial layered pnictide superlattices offer the possibility of tailoring the superconducting properties and understanding the mechanism of the superconductivity itself. For high-field applications, large critical current densities (J(c)) and irreversibility fields...

متن کامل

Quasiparticle scattering induced by charge doping of iron-pnictide superconductors probed by collective vortex pinning.

Charge doping of iron-pnictide superconductors leads to collective pinning of flux vortices, whereas isovalent doping does not. Moreover, flux pinning in the charge-doped compounds is consistently described by the mean-free path fluctuations introduced by the dopant atoms, allowing for the extraction of the elastic quasiparticle scattering rate. The absence of scattering by dopant atoms in isov...

متن کامل

Direct observation of local potassium variation and its correlation to electronic inhomogeneity in (Ba(1-x)K(x))Fe2As2 pnictide.

Local fluctuations in the distribution of dopant atoms are thought to cause the nanoscale electronic disorder or phase separation in pnictide superconductors. Atom probe tomography has enabled the first direct observations of dopant species clustering in a K-doped 122-phase pnictide. First-principles calculations suggest the coexistence of static magnetism and superconductivity on a lattice par...

متن کامل

Is the nature of magnetic order in copper-oxides and in iron- pnictides different?

We use the results of first-principles electronic structure calculations and a strong coupling perturbation approach, together with general theoretical arguments, to illustrate the differences in super-exchange interactions between the copper-oxides and iron-pnictides. We show that the two magnetic ground states can be understood in a simple manner within the same theoretical foundation. Contra...

متن کامل

Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR.

In the iron pnictide superconductors, theoretical calculations have consistently shown enhancements of the static magnetic susceptibility at both the stripe-type antiferromagnetic and in-plane ferromagnetic (FM) wave vectors. However, the possible existence of FM fluctuations has not yet been examined from a microscopic point of view. Here, using ^{75}As NMR data, we provide clear evidence for ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2010