Magnetic Field Driven Quantum Phase Transitions in Josephson Arrays

Autor:	Paramanandam, J., Bell, M. T., Ioffe, L. B., Gershenson, M. E.
Rok vydání:	2011
Předmět:	Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Superconductivity
Druh dokumentu:	Working Paper
Popis:	We have studied the magnetic-field-driven quantum phase transitions in Josephson junction arrays with a large coordination number. The characteristic energies were extracted in both the superconducting and insulating phases by integrating the current-voltage characteristics over a voltage range 2eV\leqk_B T. For the arrays with a relatively strong Josephson coupling, we observed duality between the energies in the superconducting and insulating phases. The arrays with a weaker Josephson coupling demonstrate an intermediate, "bad metal" regime in weak magnetic fields; this observation underlines the importance of vortex pinning at large scales and, presumably, emergent inhomogeneity in the presence of strong offset charge disorder. Comment: 11 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1112.6377 Zobrazit plný text záznamu View this record from Arxiv