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首页> 外文期刊>Physical review >Strong- to weak-coupling superconductivity in high-T_c bismuthates: Revisiting the phase diagram via μSR
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Strong- to weak-coupling superconductivity in high-T_c bismuthates: Revisiting the phase diagram via μSR

机译：高T_c铋酸盐中的强耦合至弱耦合超导：通过μSR重新访问相图

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摘要

Several decades after the discovery of superconductivity in bismuthates, the strength of their electron-phonon coupling and its evolution with doping remain puzzling. To clarify these issues, polycrystalline hole-doped Ba_(1-x)K_xBiO_3 (0.1 ≤ x ≤ 0.6) samples were systematically synthesized and their bulk and microscopic superconducting properties were investigated by means of magnetic susceptibility and muon-spin rotation and relaxation (μSR), respectively. The phase diagram of Ba_(1-X)K_XBiO_3 was reliably extended up to x = 0.6, which is still found to be a bulk superconductor. The lattice parameter a increases linearly with K content, implying a homogeneous chemical doping. The low-temperature superfluid density, measured via transverse-held μSR, indicates an isotropic fully gapped superconducting state with zero-temperature gaps △_0/k_BT_C = 2.15, 2.10, and 1.75, and magnetic penetration depths λ_0 = 219, 184, and 279 nm for x = 0.3, 0.4, and 0.6, respectively. A change in the superconducting gap, from a nearly ideal BCS value (1.76k_BT_C in the weak-coupling case) in the overdoped x = 0.6 region, to much higher values in the optimally doped case, implies a gradual decrease in electron-phonon coupling with doping.
机译：在铋酸盐中发现超导性几十年后，其电子-声子耦合的强度及其随掺杂的演化仍然令人费解。为了澄清这些问题，系统地合成了多晶掺杂空穴的Ba_（1-x）K_xBiO_3（0.1≤x≤0.6）样品，并通过磁化率和μ自旋旋转和弛豫（μSR）研究了它们的体积和微观超导性能。 ）， 分别。 Ba_（1-X）K_XBiO_3的相图可靠地扩展到x = 0.6，仍然发现它是体超导体。晶格参数a随着K含量线性增加，这意味着均匀的化学掺杂。通过横向保持的μSR测得的低温超流体密度表示各向同性的全隙超导状态，其零温度间隙△_0 / k_BT_C = 2.15、2.10和1.75，磁渗透深度λ_0= 219、184和279 x的nm分别为0.3、0.4和0.6。从超掺杂x = 0.6区域中的近理想BCS值（在弱耦合情况下为1.76k_BT_C）到最佳掺杂情况下的高得多的值，超导间隙的变化意味着电子-声子耦合逐渐减小掺杂。

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  • 来源
    《Physical review》 |2020年第1期|014508.1-014508.7|共7页
  • 作者

    T. Shang; D. J. Gawryluk; M. Naamneh; Z. Salman; Z. Guguchia; M. Medardc; M. Shi; N. C. Plumb; T. Shiroka;

  • 作者单位

    Laboratory for Multiscale Materials Experiments Paul Scherrer Institut Villigen CH-5232 Switzerland Physik-Institut Universitaet Zuerich Winterthurerstrasse 190 Zuerich CH-8057 Switzerland;

    Laboratory for Multiscale Materials Experiments Paul Scherrer Institut Villigen CH-5232 Switzerland;

    Swiss Light Source Paul Scherrer Institut Villigen CH-5232 Switzerland Department of Physics Ben-Gurion University of the Negev Beer-Sheva 84105 Israel;

    Laboratory for Muon-Spin Spectroscopy Paul Scherrer Institut Villigen CH-5232 Switzerland;

    Swiss Light Source Paul Scherrer Institut Villigen CH-5232 Switzerland;

    Laboratory for Muon-Spin Spectroscopy Paul Scherrer Institut Villigen CH-5232 Switzerland Laboratorium fuer Festkoerperphysik ETH Zuerich Zurich CH-8093 Switzerland;

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