Reduced effect of impurities on the universal pairing scale in the cuprates (2009)
Vorontsov, A. B., Abanov, Ar., Vavilov, M. G., Chubukov, A. V.
We consider the effect of non-magnetic impurities on the onset temperature $T^*$ for the $d-$wave pairing in spin-fluctuation scenario for the cuprates. We analyze intermediate coupling regime when...
Momentum dependence and nodes of the superconducting gap in iron-pnictides (2009)
Chubukov, A. V., Vavilov, M. G., Vorontsov, A. B.
We discuss the structure of the superconducting gap in iron pnictides. In the itinerant electron picture, gaps with or without nodes have the extended s-wave (s+) symmetry and emerge within the same...
Broken translational and time-reversal symmetry in superconducting films (2009)
We demonstrate that films of unconventional (d-wave) superconductor at temperatures $T\lesssim 0.43 T_c$ can exhibit unusual superconducting phases. The new ground states beside the broken gauge and...
Non-exponential London penetration depth in Ba$_{1-}$K$_{x}$Fe$_{2}$As$_{2}$ single crystals (2009)
Martin, C., Gordon, R. T., Tanatar, M. A., Kim, H., Ni, N., Bud'ko, S. L., ...
We have studied the in- and out-of-plane magnetic penetration depths in the hole- doped iron based superconductor Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ ($T_{c}\approx$ 30K). The study was performed on...
Superfluid density and penetration depth in Fe-pnictides (2009)
Vorontsov, A. B., Vavilov, M. G., Chubukov, A. V.
We consider the superfluid density $\rho_s (T)$ in a two-band superconductor with extended s-wave symmetry ($s^+$) in the presence of non-magnetic impurities and apply the results to Fe-pnictides. We...
Interplay between magnetism and superconductivity in Fe-pnictides (2008)
Vorontsov, A. B., Vavilov, M. G., Chubukov, A. V.
We consider phase transitions and potential co-existence of spin-density-wave (SDW) magnetic order and extended s-wave ($s^+$) superconducting order within a two-band itinerant model of iron...
Spin relaxation in quantum dots due to electron exchange with leads (2008)
Vorontsov, A. B., Vavilov, M. G.
We calculate spin relaxation rates in lateral quantum dot systems due to electron exchange between dots and leads. Using rate equations, we develop a theoretical description of the experimentally...
Boyd, G. R., Hirschfeld, P. J., Vekhter, I., Vorontsov, A. B.
Experiments on several novel superconducting compounds have observed oscillations of the specific heat when an applied magnetic field is rotated with respect to the crystal axes. The results are...
Anomalous Attenuation of Transverse Sound in 3He (2008)
Davis, J. P., Pollanen, J., Choi, H., Sauls, J. A., Halperin, W. P., Vorontsov, A. B.
We present the first measurements of the attenuation of transverse sound in superfluid 3He-B. We use fixed path length interferometry combined with the magneto-acoustic Faraday effect to vary the...
Pauli-limited upper critical field in dirty d-wave superconductors (2008)
Vorontsov, A. B., Vekhter, I., Graf, M. J.
We calculate the Pauli-limited upper critical field and the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) instability for {\it dirty} d-wave superconductors within the quasiclassical theory using the...
Surface bound states and spin currents in non-centrosymmetric superconductors (2008)
Vorontsov, A. B., Vekhter, I., Eschrig, M.
We investigate the influence of spin-orbit coupling in a non-centrosymmetric superconductor on its ground state properties near a surface. We determine the spectrum of Andreev bound states due to...
Searching for zeroes: unconventional superconductors in a magnetic field (2008)
We review the results of the microscopic approach to the calculation of the anisotropy in the specific heat in unconventional superconductors under rotated field. Treating vortex scattering on equal...
Microscopic evidence for field-induced magnetism in CeCoIn$_5$ (2006)
Urbano, R. R., Curro, N. J., Thompson, J. D., Sarrao, J. L., Vorontsov, A. B., ...
We present NMR data in the normal and superconducting states of CeCoIn$_5$ for fields close to $H_{\rm c2}(0)=11.8$ T in the $ab$ plane. Recent experiments identified a first-order transition from...
Crystalline order in superfluid 3He films (2006)
Vorontsov, A. B., Sauls, J. A.
We predict an inhomogeneous phase of superfluid 3He films in which translational symmetry is spontaneously broken in the plane of the film. This phase is energetically favored over a range of film...
Phase Diagram and Spectroscopy of FFLO states of two-dimensional d-wave superconductors (2005)
Vorontsov, A. B., Sauls, J. A., Graf, M. J.
Experimental evidence suggests that the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state may be realized in the unconventional, heavy-fermion superconductor CeCoIn$_5$. We present a self-consistent...
Thermodynamic properties of thin films of superfluid 3He-A (2003)
Vorontsov, A. B., Sauls, J. A.
The pairing correlations in superfluid He-3 are strongly modified by quasiparticle scattering off a surface or an interface. We present theoretical results and predictions for the order parameter,...