# Unconventional superconductivity

Symmetry breaking is a central concept of physics for which superconductivity provides a paradigm.

In a conventional superconductor, gauge symmetry is broken. Unconventional superfluids and superconductors can break other symmetries as well. The ISIS theory group carries out research in this area both independently and in close collaboration with experimentalists. Topics include noncentrosymmetric superconductors, high-temperature superconductors and superconductivity at complex interfaces.

**References:**

- A. D. Hillier, J. Quintanilla, and R. Cywinksi,

*Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC*_{2},

Phys. Rev. Lett. 102, 117007 (2009). - J. Quintanilla, K. Capelle, L.N. Oliveira,

Density-functional description of superconducting and magnetic proximity effects across a tunneling barrier,

Phys. Rev. B 78, 205426 (2008). - J. Quintanilla, B. L. Gyorffy,

*Cooper pairing with finite angular momentum: BCS vs Bose limits,*

J. Phys. A: Math. Gen. 36, 9379-9390 (2003). - J. Quintanilla, K. Capelle, L.N. Oliveira,

*Comment on "Anomalous proximity effect in underdoped YBa*_{2}Cu_{3}O_{6+x} Josephson junctions",

Phys. Rev. Lett. 90, 089703 (2003). - J. Quintanilla, B. L. Gyorffy,

On the nature of the superconducting gap in the cuprates,

J. Phys.: Condens. Matter 14 6591-6600 (2002). - J. Quintanilla, B.L. Gyorffy, J.F. Annett, J.P. Wallington,

*Exotic pairing via a central attraction: from the BCS to the Bose limits,*

Phys. Rev. B 66, 214526 (2002). - J. Quintanilla, B. L. Gyorffy,

*Finite Range Model Interaction Potential for d-wave Superconductors: Tc vs. Doping in the Cuprates,*

Physica B 284-288 421-422 (2000).