Low-field phenomenology and characteristic lengths of hydrogen- and halogen-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compounds
- INSA, Rennes (France). Lab. de Physique des Solides; and others
The authors measure the diamagnetic response of YBa{sub 2}Cu{sub 3}O{sub y}A{sub x} (A = Cl, F, H) ceramics. They obtain low-field effective penetration depths {lambda} of a few 10 {micro}m, first flux-penetration field H{sub 1} distinguishable from the volume penetration field H{sub C1} and two characteristic temperatures T{sub s} and {Tc}, {Tc} < T{sub s}, defined by the onset of the real and imaginary parts of the susceptibility, respectively. H{sub 1}(T) goes to zero as a power law H{sub 1}(T, x) = H{sub 1}(0, x) (T {minus} T/{Tc}){sup 2.7} near {Tc}. From the values of {lambda} and H{sub 1} they infer the correlation length {xi} at T = 4.2 K. A large range of values for {xi}(4.2) suggests that chemical disorder plays an essential role in the phenomenology of cuprates. They find {lambda}(4.2) {approximately} H{sub 1}(4.2){sup {minus}1/3}. This, and the power law {xi}(4.2) {approximately} H{sub 1}(4.2){sup {minus}2/3} result from the scaling properties of a phase transition governed by disorder.
- OSTI ID:
- 687499
- Journal Information:
- Journal of Low Temperature Physics, Vol. 116, Issue 5-6; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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