Details

Autor(en) / Beteiligte

• Iguchi, Yusuke
• Shi, Ruby A
• Kihou, Kunihiro
• Lee, Chul-Ho
• Barkman, Mats
• Benfenati, Andrea L
• Grinenko, Vadim
• Babaev, Egor
• Moler, Kathryn A

Titel

Superconducting vortices carrying a temperature-dependent fraction of the flux quantum

Ist Teil von

• Science (American Association for the Advancement of Science), 2023-06, Vol.380 (6651), p.1244-1247

Ort / Verlag

United States: The American Association for the Advancement of Science

Erscheinungsjahr

2023

Quelle

Science Online科学在线

Beschreibungen/Notizen

• Magnetic field penetrates type-II bulk superconductors by forming quantum vortices that enclose a magnetic flux equal to the magnetic flux quantum. The flux quantum is a universal quantity that depends only on fundamental constants. In this study, we investigated isolated vortices in the hole-overdoped Ba K Fe As ( = 0.77) by using scanning superconducting quantum interference device (SQUID) magnetometry. In many locations, we observed objects that carried only part of a flux quantum, with a magnitude that varied continuously with temperature. We demonstrated mobility and manipulability of these objects and interpreted them as quantum vortices with nonuniversally quantized (fractional) magnetic flux whose magnitude is determined by the temperature-dependent parameters of a multicomponent superconductor.