Metal–Bosonic Insulator–Superconductor Transition in Boron-Doped Granular Diamond
Gufei Zhang, Monika Zeleznik, Johan Vanacken, Paul W. May, Victor V. Moshchalkov
DOI 10.1103/PhysRevLett.110.077001 · Physical Review Letters
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Abstract
In a variety of superconductors, mostly in two-dimensional (2D) and one-dimensional (1D) systems, the resistive superconducting transition R(T) demonstrates in many cases an anomalous narrow R(T) peak just preceding the onset of the superconducting state R=0 at Tc. The amplitude of this R(T) peak in 1D and 2D systems ranges from a few up to several hundred percent. In three-dimensional (3D) systems, however, the R(T) peak close to Tc is rarely observed, and it reaches only a few percent in amplitude. Here we report on the observation of a giant (∼1600%) and very narrow (∼1 K) resistance peak preceding the onset of superconductivity in heavily boron-doped diamond. This anomalous R(T) peak in a 3D system is interpreted in the framework of an empirical model based on the metal–bosonic insulator–superconductor transitions induced by a granularity-correlated disorder in heavily doped diamond.
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