Strain and proximity effect in (La,Sr)2CuO4 based superconducting superlattices
H. Tabata, T. Kawai, S. Kawai
DOI 10.1103/PhysRevLett.70.2633 · Physical Review Letters
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Abstract
Controlled variations of the in-plane Cu-O bond length and interlayer proximity coupling have been produced in laser-ablated superlattices containing superconducting La1.85Sr0.15CuO4 (LSCO). In LSCO/Sm2CuO4 strained superlattices, the in-plane lattice constant a of the LSCO layers is increased and the transition temperature (Tc) is decreased. We estimate the effective pressure to be -8 GPa by comparing with LSCO/La2CuO4 unstrained superlattices. We conclude the in-plane Cu-O bond length is an important factor controlling Tc. For LSCO/overdoped-La1.65Sr0.35CuO4 (metallic) superlattices, a proximity-induced coherence length of 50 Å is calculated for the overdoped material using the de Gennes–Werthamer theory, from the Tc dependence on individual layer thickness.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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