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- Title
High-Field Magnetotransport of Epitaxial LA[sub 2-X]SR[sub X]CUO[sub 4] Thin Films in the Regime of Low SR-Doping.
- Authors
Weckhuysen, L.; Vanacken, J.; Wagner, P.; Ruan, K.-Q.; Gordon, I.; Moshchalkov, V. V.; Bruynseraede, Y.
- Abstract
High temperature superconductors have an unusual temperature (T) - doping (x) phase diagram, in which both antiferromagnetism and superconductivity occur. The spin gap and the superconducting gap are the two essential features of the T(x) plane which evolve with doping. A material allowing investigating the T-x plane in detail, from the underdoped (x<0.15) to the overdoped (x>0.15) regime, is the La[sub 2-x]Sr[sub x]CuO[sub 4] superconductor. The temperature dependence of the resistivity strongly depends on the substitution ratio x. Overdoped films show metallic behavior, meaning that ρ(T) is linear above 100 K, while it saturates for lower temperatures. This saturation persists below T[sub c], when superconductivity is suppressed by sufficiently high pulsed magnetic fields. From the slightly overdoped (0.2 < x) down to the strongly underdoped regime (x ∼ 0.03) we observe, instead of saturation, a ρ(T) dependence with logarithmic divergence in the field-induced normal state at T → 0. For underdoped films (x<0.1) a superlinear ρ(T) behavior develops at intermediate temperatures (50 K < T< 200 K), indicating the opening of the spin gap.
- Subjects
HIGH temperature superconductors; ANTIFERROMAGNETISM; SUPERCONDUCTIVITY; EPITAXY
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2000, Vol 14, Issue 29/31, p3747
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979200004295