Magnetic penetration depth in superconducting La2−xSrxCuO4 films

Kathleen M. Paget; Sabyasachi Guha; Marta Z. Cieplak; Igor E. Trofimov; Stefan J. Turneaure; Thomas R. Lemberger

doi:10.1103/PhysRevB.59.641

← Back to search

Magnetic penetration depth in superconducting La2−xSrxCuO4 films

Kathleen M. Paget, Sabyasachi Guha, Marta Z. Cieplak, Igor E. Trofimov, Stefan J. Turneaure, Thomas R. Lemberger

DOI 10.1103/PhysRevB.59.641 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have measured the magnetic penetration depth λ(T) in a series of superconducting La2−xSrxCuO4 films with Sr concentrations from x=0.135 to 0.175. λ−2(T)−λ−2(0) is quadratic in T for 0.4<T<10 K, which puts an upper limit of about 4 K on a possible isotropic gap. The larger magnitude of λ(0), reduced TC, and higher resistivity of films relative to bulk samples, plus the T2 behavior of λ−2(T)−λ−2(0), lead naturally to the conclusion that superconductivity in La2−xSrxCuO4 is d wave. Near TC the real part of the conductivity and λ(T) are analyzed for critical behavior. The data indicate that the critical region is no wider than 1 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.5	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	27.5	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	27	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	27.5	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown