Enhanced superconductivity and superconductor to insulator transition in nano-crystalline molybdenum thin films
arXiv:1506.06089 · doi:10.1016/j.physb.2017.03.044
Abstract
Disorder driven superconductor to insulator transition via intermediate metallic regime is reported in nano-crystalline thin films of molybdenum. The nano-structured thin films have been deposited at room temperature using DC magnetron sputtering at different argon pressures. The grain size has been tuned using deposition pressure as the sole control parameter. A variation of particle sizes, room temperature resistivity and superconducting transition has been studied as a function of deposition pressure. The nano-crystalline molybdenum thin films are found to have large carrier concentration but very low mobility and electronic mean free path. Hall and conductivity measurements have been used to understand the effect of disorder on the carrier density and mobilities. Ioffe-Regel parameter is shown to correlate with the continuous metal-insulator transition in our samples.
23 pages, 10 figures
References in corpus (11)
- Nature of the superconductor-insulator transition in disordered superconductors
- Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
- Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
- Observation of shell effects in superconducting nanoparticles of Sn
- Size dependence of the Tc and the superconducting energy gap in nanocrystalline thin films of Nb
- Shaping a superconducting dome: Enhanced Cooper-pairing versus suppressed phase coherence in coupled aluminum nanograins
- Size induced metal insulator transition in nanostructured Niobium thin films: Intragranular and intergranular contributions
- Scale dependent superconductor-insulator transition
- Competing effects of surface phonon softening and quantum size effects on the superconducting properties of nanostructured Pb
- Phase diagram and upper critical field of homogenously disordered epitaxial 3-dimensional NbN films
- Signature of Cooper Pairs in the Non-Superconducting Phases of Amorphous Superconducting Tantalum Films
Cited by in corpus (3)
- Sputtering Current Driven Growth & Transport Characteristics of Superconducting Ti40V60 Alloy Thin Films
- Studies on DC transport and terahertz conductivity of granular molybdenum thin films for microwave radiation detector applications
- Negative substrate bias induced modifications of the physical properties of DC sputter deposited nano-crystalline Mo thin films