scholarly journals Dynamics of time-reversal-symmetry-breaking vortices in unconventional superconductors

1998 ◽  
Vol 57 (2) ◽  
pp. R724-R727 ◽  
Author(s):  
Z. D. Wang ◽  
Qiang-Hua Wang
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Time Reversal Symmetry ◽  
Unconventional Superconductors

Search for time-reversal symmetry breaking in unconventional superconductors

2009 ◽  
Vol 404 (3-4) ◽  
pp. 507-509 ◽  
Author(s):  
Aharon Kapitulnik ◽  
Jing Xia ◽  
Elizabeth Schemm
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Time Reversal Symmetry ◽  
Unconventional Superconductors

scholarly journals Polar Kerr effect as probe for time-reversal symmetry breaking in unconventional superconductors

2009 ◽  
Vol 11 (5) ◽  
pp. 055060 ◽  
Author(s):  
Aharon Kapitulnik ◽  
Jing Xia ◽  
Elizabeth Schemm ◽  
Alexander Palevski
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Kerr Effect ◽  
Time Reversal Symmetry ◽  
Unconventional Superconductors ◽  
Polar Kerr Effect

scholarly journals Dirac lines and loop at the Fermi level in the time-reversal symmetry breaking superconductor LaNiGa2

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Jackson R. Badger ◽  
Yundi Quan ◽  
Matthew C. Staab ◽  
Shuntaro Sumita ◽  
Antonio Rossi ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Fermi Level ◽  
Time Reversal ◽  
Orbit Coupling ◽  
Time Reversal Symmetry ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Electronic Band ◽  
Unconventional Superconductors ◽  
Topological Features

AbstractUnconventional superconductors have Cooper pairs with lower symmetries than in conventional superconductors. In most unconventional superconductors, the additional symmetry breaking occurs in relation to typical ingredients such as strongly correlated Fermi liquid phases, magnetic fluctuations, or strong spin-orbit coupling in noncentrosymmetric structures. In this article, we show that the time-reversal symmetry breaking in the superconductor LaNiGa2 is enabled by its previously unknown topological electronic band structure, with Dirac lines and a Dirac loop at the Fermi level. Two symmetry related Dirac points even remain degenerate under spin-orbit coupling. These unique topological features enable an unconventional superconducting gap in which time-reversal symmetry can be broken in the absence of other typical ingredients. Our findings provide a route to identify a new type of unconventional superconductors based on nonsymmorphic symmetries and will enable future discoveries of topological crystalline superconductors.

scholarly journals Unsplit superconducting and time reversal symmetry breaking transitions in Sr2RuO4 under hydrostatic pressure and disorder

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Vadim Grinenko ◽  
Debarchan Das ◽  
Ritu Gupta ◽  
Bastian Zinkl ◽  
Naoki Kikugawa ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Symmetry Breaking ◽  
Time Reversal ◽  
Order Parameter ◽  
Muon Spin Rotation ◽  
Horizontal Line ◽  
Time Reversal Symmetry ◽  
Zero Field ◽  
Symmetry Protected ◽  
Line Node

AbstractThere is considerable evidence that the superconducting state of Sr2RuO4 breaks time reversal symmetry. In the experiments showing time reversal symmetry breaking, its onset temperature, TTRSB, is generally found to match the critical temperature, Tc, within resolution. In combination with evidence for even parity, this result has led to consideration of a dxz ± idyz order parameter. The degeneracy of the two components of this order parameter is protected by symmetry, yielding TTRSB = Tc, but it has a hard-to-explain horizontal line node at kz = 0. Therefore, s ± id and d ± ig order parameters are also under consideration. These avoid the horizontal line node, but require tuning to obtain TTRSB ≈ Tc. To obtain evidence distinguishing these two possible scenarios (of symmetry-protected versus accidental degeneracy), we employ zero-field muon spin rotation/relaxation to study pure Sr2RuO4 under hydrostatic pressure, and Sr1.98La0.02RuO4 at zero pressure. Both hydrostatic pressure and La substitution alter Tc without lifting the tetragonal lattice symmetry, so if the degeneracy is symmetry-protected, TTRSB should track changes in Tc, while if it is accidental, these transition temperatures should generally separate. We observe TTRSB to track Tc, supporting the hypothesis of dxz ± idyz order.

scholarly journals Time-reversal symmetry breaking superconducting ground state in the doped Mott insulator on the honeycomb lattice

2013 ◽  
Vol 88 (15) ◽  
Author(s):  
Zheng-Cheng Gu ◽  
Hong-Chen Jiang ◽  
D. N. Sheng ◽  
Hong Yao ◽  
Leon Balents ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Ground State ◽  
Time Reversal ◽  
Mott Insulator ◽  
Honeycomb Lattice ◽  
Time Reversal Symmetry ◽  
Doped Mott Insulator
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