Magnetic properties of the superconducting ‘‘superoxide’’ La 2 CuO 4 + <mml:mi …
1989; American Physical Society; Volume: 40; Issue: 4 Linguagem: Inglês
10.1103/physrevb.40.2555
ISSN1095-3795
AutoresE. J. Ansaldo, J. H. Brewer, T. M. Riseman, J. E. Schirber, E.L. Venturini, B. Morosin, D.S. Ginley, B. J. Sternlieb,
Tópico(s)Advanced Condensed Matter Physics
ResumoThe magnetic properties of ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ (\ensuremath{\delta}\ensuremath{\le}0.13) have been determined by means of muon-spin rotation and relaxation in transverse and zero external fields. A fraction ${f}_{\mathrm{SC}=0.6}$ of the sample was found to be superconducting with ${T}_{c}$=35(1) K and extrapolated penetration depth \ensuremath{\lambda}(0)=4200 A\r{} (powder average). The other phase, 40% of the sample volume, displayed static magnetic ordering identical to that of oxygenated ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$. The T dependence of \ensuremath{\lambda} is similar to that for samples of the ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Sr}}_{\mathrm{x}}$${\mathrm{CuO}}_{4}$ family.
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