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            <title xml:lang="en">Study of the flux pattern in the high-Tc superconductor YBa2Cu3O7 by 89Y-NMR</title>
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                <title xml:lang="en">Study of the flux pattern in the high-Tc superconductor YBa2Cu3O7 by 89Y-NMR</title>
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                <term xml:lang="en">High Temperature Superconductors</term>
                <term xml:lang="en">Yttrium Barium Copper Oxides</term>
                <term xml:lang="en">Oxide Superconductors</term>
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              <p>The field distribution in the superconducting state of the high-Tc superconductor YBa2Cu3O7 has been probed by 89Y-NMR. Data have been taken on oriented powder samples in a field of 7.5 T for H{norm of matrix}c-axis and H{norm of matrix} (a,b)-plane. For H{norm of matrix} line broadening is only detected below 83 K, i.e. 10% lower than the zero field transition temperature Tc(0) ≈ 92 K. The temperature dependence of the linewidth is well described by a two-fluid formula if T is scaled by the melting or irreversibility temperature T*∼83 K instead of Tc(0), as in the analysis of the low-field muon data.</p>
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