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  • 1
    Digitale Medien
    Digitale Medien
    An NMR approach to the superconducting regime of the spin ladder compound Sr Ca Cu O (2000)
    Springer
    The European physical journal 13 (2000), S. 417-420 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 74.72.Jt Other cuprates - 74.25.Ha Magnetic properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: 63Cu-NMR experiments of Knight shift and relaxation time T1 have been performed on the two-leg spin ladders of a Sr2Ca12Cu24O41 single crystal at several pressures up to the critical pressure for the stabilization of a superconducting ground state. The data confirm the onset of low-lying spin excitations at observed previously [Science 279, 345 (1998)] and reveal a marked decrease of the spin gap under pressures above 20 kbar although a significant fraction of the spin excitations remains gapped at kbar. A comparison between NMR and transport data under pressure suggests that the depression of the spin gap can be ascribed to an increase in the interladder exchange coupling, possibly mediated by the ladder-chain interaction along the b-direction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510050052
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic resonance in pure and diamagnetically diluted spin-Peierls CuGeO3 (1996)
    Springer
    JETP letters 64 (1996), S. 305-311 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 76.50.+g ; 75.50.Kj ; 75.30.G
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Magnetic resonance at frequencies 22–75 GHz is investigated in pure single-crystalline CuGeO3 in the temperature range 1.2–25 K. At temperatures below 4 K the magnetic resonance line splits into four spectral components. The line close to the ESR of the paramagnetic phase is associated with impurities or defects. The other three lines have the same intensity in different samples and are apparently characteristic for pure single crystals at low temperature. An antiferromagnetic resonance with two resonance absorption branches and a spectrum characteristic for an antiferromagnet with easy, average, and hard anisotropy axes was observed and investigated in the Néel compound Cu0.98Zn0.02GeO3 with diamagnetic dilution of the spin subsystem.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.567188
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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