Probing the Order Parameter and the {ital c} -Axis Coupling of High-{ital T}{sub {ital c}} Cuprates by Penetration Depth Measurements
- Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 OHE (United Kingdom)
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)
We have measured the low-temperature (T) dependence of the anisotropic penetration depth {lambda}(T) of magnetically aligned powders of HgBa{sub 2}Ca {sub n{minus}1}Cu{sub n}O{sub 2n+2+{delta}} (n=1 and 3) down to 1.2K. For both members the T dependence of the in-plane penetration depth {lambda}{sub ab}(T) is strongly linear, whereas the out-of-plane component {lambda}{sub c}(T) , for n=1 and 3, varies as T{sup 5} and T{sup 2} , respectively. For comparison, we also report {lambda}{sub c}(T) data for grain-aligned YBa{sub 2}Cu {sub 3}O{sub 7 {minus}{delta}} ({delta}=0.0 and 0.43) which vary as T and T{sup 2} , respectively. The results are discussed in terms of d{sub x{sup 2}{minus}y{sup 2}}- wave symmetry of the order parameter in cuprates. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 542670
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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