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Magnetic field tuning of charge and spin order in the cuprate superconductors
Anatoli Polkovnikov, Subir Sachdev, Matthias Vojta +1
Recent neutron scattering, nuclear magnetic resonance, and scanning tunneling microscopy experiments have yielded valuable new information on the interplay between charge and spin…
A fractional-spin phase in the power-law Kondo model
Matthias Vojta, Ralf Bulla
We consider a Kondo impurity coupled to a fermionic host with a power-law density of states near the Fermi level, rho(epsilon) ~ |epsilon|^r, with exponent r<0. Using both perturba…
Kondo effect of impurity moments in d-wave superconductors: Quantum phase transition and spectral properties
Matthias Vojta, Ralf Bulla
We discuss the dynamics of magnetic moments in d-wave superconductors, in particular we focus on moments induced by doping non-magnetic impurities into cuprates. The interaction of…
Quantum phase transitions in models of coupled magnetic impurities
Matthias Vojta, Ralf Bulla, Walter Hofstetter
We discuss models of interacting magnetic impurities coupled to a metallic host. If twice the sum of the impurity spins is larger than the total number of host screening channels,…
Quantum phase transitions and collective modes in d-wave superconductors
Matthias Vojta, Subir Sachdev
Fluctuations near second-order quantum phase transitions in d-wave superconductors can cause strong damping of fermionic excitations, as observed in photoemission experiments. The…
Magnetic properties and spin waves of bilayer magnets in a uniform field
Torsten Sommer, Matthias Vojta, Klaus W. Becker
The two-layer square lattice quantum antiferromagnet with spins 1/2 shows a zero-field magnetic order-disorder transition at a critical ratio of the inter-plane to intra-plane coup…