27 research outputs found
GammaRay 2018 Proceedings: Seminar for users of gamma ray spectrometry
In September 2018 a two day seminar for users of gamma ray spectrometry was arranged in Reykjavik, Iceland. 34 participants from 20 organisations were present. Two lecturers were invited: I. Osvath from IAEA, who gave a presentation on the 2017 IAEA proficiency test with a focus on the sample with the more challenging short lived radionuclides, and M. Bruggeman from SCK-CEN, who gave a presentation on efficiency transfer for low-energy gamma-ray spectrometry. In addition, 14 participants presented development and experiences related to gamma-ray spectrometry. This seminar was the 9th in a serie since 2009 financed by NKS
Superconductivity on the localization threshold and magnetic-field-tuned superconductor-insulator transition in TiN films
Temperature- and magnetic-field dependent measurements of the resistance of
ultrathin superconducting TiN films are presented. The analysis of the
temperature dependence of the zero field resistance indicates an underlying
insulating behavior, when the contribution of Aslamasov-Larkin fluctuations is
taken into account. This demonstrates the possibility of coexistence of the
superconducting and insulating phases and of a direct transition from the one
to the other. The scaling behavior of magnetic field data is in accordance with
a superconductor-insulator transition (SIT) driven by quantum phase
fluctuations in two-dimensional superconductor. The temperature dependence of
the isomagnetic resistance data on the high-field side of the SIT has been
analyzed and the presence of an insulating phase was confirmed. A transition
from the insulating to a metallic phase is found at high magnetic fields, where
the zero-temperature asymptotic value of the resistance being equal to h/e^2.Comment: 5 pages, 4 eps figures, RevTeX4, Published versio