Effect of a Zeeman field on the superconductor-ferromagnet transition in metallic grains
arXiv:0704.2257 · doi:10.1209/0295-5075/80/47004
Abstract
We investigate the competition between pairing correlations and ferromagnetism in small metallic grains in the presence of a Zeeman field. Our analysis is based on the universal Hamiltonian, valid in the limit of large Thouless conductance. We show that the coexistence regime of superconducting and ferromagnetic correlations can be made experimentally accessible by tuning an external Zeeman field. We compare the exact solution of the model with a mean-field theory and find that the latter cannot describe pairing correlations in the intermediate regime. We also study the occurrence of spin jumps across the phase boundary separating the superconducting and coexistence regimes.
6 pages, 4 figures
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- An Exact Solution for Spin and Charge Correlations in Quantum Dots: The Effect of Level Fluctuations and Zeeman Splitting
- Mesoscopic Stoner instability in open quantum dots: suppression of Coleman-Weinberg mechanism by electron tunneling
- A quantum dot close to Stoner instability: the role of Berry's Phase
- Spin fluctuations in quantum dots
- Statistics of Spin Fluctuations in Quantum Dots with Ising Exchange
- The coexistence of superconductivity and ferromagnetism in nano-scale metallic grains
- Inelastic electron scattering off a quantum dot in the cotunneling regime: the signature of mesoscopic Stoner instability
- U(1) and SU(2) quantum dissipative systems: The Caldeira-Leggett vs. the Amegaokar-Eckern-Schön approaches
- Tunneling density of states in quantum dots with anisotropic exchange
- Spin-orbit scattering in superconducting nanoparticles
- Mesoscopic interplay of superconductivity and ferromagnetism in ultra-small metallic grains