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Spontaneously broken time-reversal symmetry in high-temperature superconductors

Mikael Håkansson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Tomas Löfwander (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Mikael Fogelström (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Nature Physics (1745-2473). Vol. 11 (2015), 9, p. 755-760.
[Artikel, refereegranskad vetenskaplig]

Conventional superconductors are strong diamagnets that, through the Meissner effect, expel magnetic fields. It would therefore be surprising if a superconducting ground state would support spontaneous magnetics fields. Such time-reversal symmetry-broken states have been proposed for the high-temperature superconductors, but their identification remains experimentally controversial. Here we show a route to a low-temperature superconducting state with broken time-reversal symmetry that may accommodate currently conflicting experiments. This state is characterized by an unusual vortex pattern in the form of a necklace of fractional vortices around the perimeter of the material, where neighbouring vortices have opposite current circulation. This vortex pattern is a result of a spectral rearrangement of current-carrying states near the edges.



Denna post skapades 2015-09-18. Senast ändrad 2016-08-18.
CPL Pubid: 222787

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Nanoteknik

Chalmers infrastruktur