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<p>A <sup>63</sup>Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>2.05</sub>CuO<sub><i>y</i></sub>, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4242_Article_IEq1.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="60" /> </InlineMediaObject> <EquationSource Format="TEX">\(T{\text{*}} = 60\)</EquationSource> <!--JETPLet2560710Vyaselev-m1--> </InlineEquation> K, significantly above the superconducting critical temperature <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4242_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\({{T}_{{\text{c}}}} \simeq 9 \)</EquationSource> <!--JETPLet2560710Vyaselev-m2--> </InlineEquation> K at the NMR experiment field, 7 T oriented <b>H</b> || <i>c</i>. The noticeable disparity between <i>T</i><sub>c</sub> and <i>T</i> * and the behavior of Cu SLR at <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4242_Article_IEq3.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(T &gt; T{\text{*}}\)</EquationSource> <!--JETPLet2560710Vyaselev-m3--> </InlineEquation> imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11448_2025_4242_Article_IEq4.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\( \approx \)</EquationSource> <!--JETPLet2560710Vyaselev-m4--> </InlineEquation>7 K) shift of the zero-field <i>T</i><sub>c0</sub>&#xa0;=&#xa0;(16 ± 1) K under the applied 7 T field suggests high upper critical field, <i>H</i><sub>c2</sub>, unusual for compounds with as low <i>T</i><sub>c0</sub>.</p>

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Nuclear Magnetic Resonance Evidence for a Pseudogap in a Pb-Doped Bi:2201 Single Crystal

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  • 发表日期：

    2025年7月15日

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  • O. M. Vyaselev

摘要

A 63Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near \(T{\text{*}} = 60\) K, significantly above the superconducting critical temperature \({{T}_{{\text{c}}}} \simeq 9 \) K at the NMR experiment field, 7 T oriented H || c. The noticeable disparity between Tc and T * and the behavior of Cu SLR at \(T > T{\text{*}}\) imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small ( \( \approx \) 7 K) shift of the zero-field Tc0 = (16 ± 1) K under the applied 7 T field suggests high upper critical field, Hc2, unusual for compounds with as low Tc0.