YBa_{2}CU_{3}O_{7}/PrBa_{2}Cu_{3}O_{7} superlattices: Properties of Ultrathin superconducting layers separated by insulating layers

Superconductivity of one-unit-cell thickYBa2Cu3Terashima1, Shimura2, Bandō3 et al. 1991Phys. Rev. Lett.2284750View full textAdd to dashboardCite

“…Triscone et ai [2] have reported that their YBCO(24 A)/PrBCO(24 A) superlattice showed a similar fieldindependent behavior in the parallel-field configuration. However, in their YBCO(12 A)/PrBCO(12 A) and YBCO(12 A)/PrBCO(48 A) superlattices, a remarkable broadening of the transition was observed.…”

“…(1) What is the minimum unit needed for the occurrence of superconductivity in HTSC? (2) How essential is the interCu02-layer coupling in determining Tel…”

“…Recently, superlattices comprising ultrathin layers of YBCO and nonsuperconducting PrBa2Cu307 (PrBCO) have been intensively studied in order to give answers to these problems [2][3][4].…”

Superconductivity in molecule-intercalatedLixZrNClwith variable interlayer spacing

“…Thus far, the effect of two dimensionality on superconductivity has been studied by several experimental techniques, such as searching for new layered superconducting materials and making films with one-unit-cell thickness 6 or with a quantum well structure. 7 However, systematic control of dimensionality is difficult since several intrinsic and/or extrinsic origins affect T c . The electrondoped layered nitride ZrNCl and HfNCl superconductors 8,9 are candidates to enable systematic control of carrier density and two dimensionality because modulation of the interlayer distance has been demonstrated solely by means of organic molecule intercalation.…”

Unusual electronic structure ofPrBa2Cu3Fehrenbacher1, Rice2 1993Phys. Rev. Lett.

“…The strong broadening can be explained by the possible decay of a magnetic excitation on the Pr into AF spin waves on the CuC>2 planes, which strongly reduces the lifetime of these excitations, (e) In the alloy Yix Pr x -07, the Pr IV state not only absorbs holes [7,8], it can also act as a pair breaker, since there exists a small exchange coupling to the 2p a O orbitals. (f) Concerning the (Y-C>7)A/(Pr-07)/v superlattices [24], we can now rule out the possibility of significant charge transfer between Y and Pr blocks which we suggested to explain T C (M,N) [12]. The similar hole densities on the chains in Y-O7 and Pr-07, and the fact that a hole occupying a Pr ,v state spends most of its time on O sites belonging to the CuC>2 planes (just like holes doped into the SC t-J band of Y-O7), suggest that the charge distributions in Y-O7 and Pr-07 are very similar.…”