Zobrazeno 1 - 10
of 193
pro vyhledávání: '"Graser, S."'
Publikováno v:
Phys. Rev. B 88, 174518 (2013)
Using realistic multi-orbital tight-binding Hamiltonians and the T-matrix formalism, we explore the effects of a non-magnetic impurity on the local density of states in Fe-based compounds. We show that scanning tunneling spectroscopy (STS) has very s
Externí odkaz:
http://arxiv.org/abs/1308.6248
Publikováno v:
J. Supercond. Novel Magn. 26, 1729 (2013)
The spin-fluctuation based pairing mechanism has proven successful in explaining the pairing symmetries due to Fermi surface nesting of both cuprates and iron-based materials. In this work, we study signatures of a spin-fluctuation mediated pairing a
Externí odkaz:
http://arxiv.org/abs/1206.1129
Publikováno v:
Phys. Rev. B 86, 054507 (2012)
We present a self-consistent real space formulation of spin-fluctuation mediated d-wave pairing. By calculating all relevant inhomogeneous spin and charge susceptibilities in real space within the random phase approximation (RPA), we obtain the effec
Externí odkaz:
http://arxiv.org/abs/1206.0888
Autor:
Wang, Y., Kim, J. S., Stewart, G. R., Hirschfeld, P. J., Graser, S., Kasahara, S., Terashima, T., Matsuda, Y., Shibauchi, T., Vekhter, I.
Publikováno v:
Phys. Rev. B 84, 184524 (2011)
We present measurements of the specific heat coefficient \gamma(= C/T) in the low temperature limit as a function of an applied magnetic field for the Fe-based superconductor BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$. We find both a linear regime at higher f
Externí odkaz:
http://arxiv.org/abs/1109.0554
Publikováno v:
Phys. Rev. Lett. 108, 117002 (2012)
Strong correlations are known to severely reduce the mobility of charge carriers near half-filling and thus have an important influence on the current carrying properties of grain boundaries in the high-$T_c$ cuprates. In this work we present an exte
Externí odkaz:
http://arxiv.org/abs/1106.5759
Publikováno v:
Phys. Rev. B 83, 220505(R) (2011)
Neutron spin-flip scattering observations of a resonance in the superconducting state is often taken as evidence of an unconventional superconducting state in which the gap changes sign $\Delta(k+Q)=-\Delta(k)$ for momentum transfers $Q$ which play a
Externí odkaz:
http://arxiv.org/abs/1103.0688
Publikováno v:
Phys. Rev. B 84, 014524 (2011)
The Fermi surfaces of Fe-pnictide superconductors are fairly two-dimensional (2D), and it has thus come as a surprise that recent penetration depth and thermal conductivity measurements on systems of the 122 type have reported c-axis transport coeffi
Externí odkaz:
http://arxiv.org/abs/1101.5699
Publikováno v:
Phys. Rev. B 83, 100515(R) (2011)
Angle-resolved photoemission spectroscopy measurements on the recently discovered superconduc- tors in the KFe2Se2 family with critical temperatures up to - 33K suggest that no Fermi pockets of hole character centered on the {\Gamma} point of the Bri
Externí odkaz:
http://arxiv.org/abs/1101.4988
Autor:
Park, J. T., Inosov, D. S., Yaresko, A., Graser, S., Sun, D. L., Bourges, Ph., Sidis, Y., Li, Yuan, Kim, J. -H., Haug, D., Ivanov, A., Hradil, K., Schneidewind, A., Link, P., Faulhaber, E., Glavatskyy, I., Lin, C. T., Keimer, B., Hinkov, V.
Publikováno v:
Phys. Rev. B 82, 134503 (2010)
We study the symmetry of spin excitation spectra in 122-ferropnictide superconductors by comparing the results of first-principles calculations with inelastic neutron scattering (INS) measurements on BaFe1.85Co0.15As2 and BaFe1.91Ni0.09As2 samples th
Externí odkaz:
http://arxiv.org/abs/1007.3722
Autor:
Foyevtsova, Kateryna, Kandpal, H. C., Jeschke, Harald O., Graser, S., Cheng, H. -P., Valentí, Roser, Hirschfeld, P. J.
Publikováno v:
Phys. Rev. B 82, 054514 (2010)
Scanning tunneling spectroscopy measurements on the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ have reported an enhanced spectral gap in the neighborhood of O dopant atoms. We calculate, within density functional theory (DFT),
Externí odkaz:
http://arxiv.org/abs/1006.2014