Parallel Magnetic Field Induced Glass-Like Behavior of Disordered Ultrathin Films
L. M. Hernandez, A. Bhattacharya, K. A. Parendo, A. M. Goldman
Abstract
Dramatic glass-like behavior involving nonexponential relaxation of in-plane electrical conduction, has been induced in quench-condensed ultrathin amorphous Bi films by the application of a parallel magnetic field. The effect is found over a narrow range of film thicknesses well on the insulating side of the thickness-tuned superconductor-insulator transition. The simplest explanation of this field-induced glass-like behavior is a Pauli principle blocking of hopping transport between singly occupied states when electrons are polarized by the magnetic field. A second explanation involving weak coupling of superconducting clusters by intercluster interactions of random sign is also discussed.
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