Orbital coupling and superconductivity in the iron pnictides (2009)
Zhang, Junhua, Sknepnek, Rastko, Fernandes, Rafael M., Schmalian, Joerg
We demonstrate that strong inter-orbital interaction is very efficient to achieve superconductivity due to magnetic fluctuations in the iron pnictides. Fermi surface states that are coupled by the...
Anisotropic pairing in the iron pnictides (2008)
Sknepnek, Rastko, Samolyuk, German, Lee, Yong-bin, Schmalian, Joerg
We determine the anisotropy of the spin fluctuation induced pairing gap on the Fermi surface of the FeAs based superconductors as function of the exchange and Hund's coupling $J_{H}$. We find that...
Universality of liquid-gas Mott transitions at finite temperatures (2007)
Papanikolaou, Stefanos, Fernandes, Rafael Monteiro, Fradkin, Eduardo, Phillips, Philip W., Schmalian, Joerg, Sknepnek, Rastko
We explain in a consistent manner the set of seemingly conflicting experiments on the finite temperature Mott critical point, and demonstrate that the Mott transition is in the Ising universality...
Quantum phase transitions of the diluted O(3) rotor model (2006)
Vojta, Thomas, Sknepnek, Rastko
We study the phase diagram and the quantum phase transitions of a site-diluted two-dimensional O(3) quantum rotor model by means of large-scale Monte-Carlo simulations. This system has two quantum...
Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4 (2006)
Dalidovich, Denis, Sknepnek, Rastko, Berlinsky, A. John, Zhang, Junhua, Kallin, Catherine
The ground state properties and neutron structure factor for the two-dimensional antiferromagnet on the triangular lattice, with uni-directional anisotropy in the nearest-neighbor exchange couplings...
Dynamics at a smeared phase transition (2004)
Fendler, Bernard, Sknepnek, Rastko, Vojta, Thomas
We investigate the effects of rare regions on the dynamics of Ising magnets with planar defects, i.e., disorder perfectly correlated in two dimensions. In these systems, the magnetic phase transition...
Critical points and quenched disorder: From Harris criterion to rare regions and smearing (2004)
Vojta, Thomas, Sknepnek, Rastko
We consider the influence of quenched spatial disorder on phase transitions in classical and quantum systems. We show that rare strong disorder fluctuations can have dramatic effects on critical...
Sknepnek, Rastko, Vojta, Thomas, Vojta, Matthias
We present large-scale Monte-Carlo simulations of a two-dimensional (2d) bilayer quantum Heisenberg antiferromagnet with random dimer dilution. In contrast to the exotic scaling scenarios found in...
Sknepnek, Rastko, Vojta, Thomas
We present results of large-scale Monte Carlo simulations for a three-dimensional Ising model with short range interactions and planar defects, i.e., disorder perfectly correlated in two dimensions....
Sknepnek, Rastko, Vojta, Thomas, Narayanan, Rajesh
We derive an order-parameter field theory for a quantum phase transition between a disordered metal and an exotic (non-s-wave) superconductor. Mode coupling effects between the order parameter and...
Infinite-randomness critical point in the itinerant quantum antiferromagnet (2002)
Sknepnek, Rastko, Vojta, Thomas
We study the quantum phase transition in the three-dimensional disordered itinerant antiferromagnet by Monte-Carlo simulations of the order-parameter field theory. We find strong evidence for the...
The quantum phase transition of itinerant helimagnets (2000)
Vojta, Thomas, Sknepnek, Rastko
We investigate the quantum phase transition of itinerant electrons from a paramagnet to a state which displays long-period helical structures due to a Dzyaloshinskii instability of the ferromagnetic...