Little-Parks effect in single nanoscaleYBa2Cu3O6+xrings

Macroscopic quantum phenomena in Josephson structures

“…These improvements reflect the advances registered in patterning simple nanobridges, which have been reproducibly scaled on c-axis YBCO down to about 100 nm [57]. Studies on flux dynamics have been also realized in nanorings of inner and external radius of about 150 nm and 300 nm, respectively [58].…”

YBa 2 Cu 3 O 7−δ nanorings to probe fluxoid quantization in High Critical Temperature Superconductors

“…In the case of HTS, these measurements can shed light on the HTS pairing mechanisms. Magnetoresistance measurements made on HTS nanorings [11,12], and in particular on YBa 2 Cu 3 O 7Àd (YBCO) submicron rings [13], have shown, up to now, that in the optimally doped regime only the periodicity h=2e is present. However, the various theories for the microscopic mechanism of HTS give the sharpest predictions in the underdoped regime.…”

Anisotropy of the critical temperature of a superconducting niobium thin film with an array of nanoscale holes in an external magnetic field

“…When the dimensions of a material are reduced to a characteristic length, new behavior emerges governed by a new set of mechanisms due to confinement-induced changes in the wave function of the charge carriers and other fundamental quantities [1][2][3][4][5][6][7][8][9][10] . For example, the circulation of Cooper pairs confined in a path with lateral dimensions comparable to the superconducting coherence length ξ produces the Little-Parks effect 1,[8][9][10][11][12][13] . A superconducting strip narrower than its penetration depth λ cannot sustain a complete flux exclusion, resulting in lower diamagnetic energy which then leads to a higher critical field H c 14, 15 .…”