DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 81: Superconductivity: Properties and Electronic Structure

TT 81.10: Talk

Thursday, April 3, 2014, 12:00–12:15, HSZ 201

Effect of Coulomb Interactions on the Disorder-Driven Superconductor-Insulator TransitionDaniel Sherman1,2, Uwe S. Pracht1, Boris Gorshunov1,3,4, Shachaf Poran2, Nandini Trivedi5, Pratap Raychaudhuri6, Aviad Frydman2, and •Martin Dressel111. Phys. Inst., Universität Stuttgart, Germany — 2Dept. Phys., Bar Ilan Univ., Israel — 3Prokhorov Inst. Gen. Phys., RAS, Moscow, Russia — 4Moscow Inst. Phys. Techn., Dolgoprudny, Russia — 5Dept. Phys., Ohio State Univ., Columbus, OH, U.S.A. — 6Tata Inst. Fund. Res., Mumbai, India

We have studied the evolution of the superconducting energy gap through the disorder-driven superconductor to insulator transition in InO and NbN films using two distinct experimental methods that allow us to test the influence of metallic screening on the electronic interactions. In the case of tunneling spectroscopy a metallic electrode is adjacent to the superconducting film thus screening Coulomb interactions. On the other hand terahertz spectroscopy is a contactless method which probes the sample without affecting the electron-electron interaction. In the presence of screening, a similar superconducting gap is detected on both sides of the superconductor-insulator transition, and at temperatures above and below Tc. Contactless measurements are able to identify the superconducting gap below but not above the critical temperature or in the insulating state. Our study reveals the importance of Coulomb interactions on the energy gap of disordered superconductors.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden