Tunneling spectroscopic measurement in lanthanide substituted Bi2Sr2CuO6+δ

Kamijo, Y.; Machida, T.; Tsuji, Naoto; Harada, Kazuho; Saito, Ryo; Noguchi, T.; Kato, Takuya; Sakata, Hideaki

doi:10.1016/j.physc.2007.03.094

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“…It is noteworthy that two kinds of asymmetric behavior coexist in various cuprates. In addition to the dip-hump structure, which is the subject of the current research, and a frequently observed difference between the heights of the coherent superconducting peaks near the gapedges [18,24,51,61,75,76], the overall G(V ) dependence has an asymmetric contribution at voltages far beyond the gap region [18,24,25,46,61,[75][76][77][78][79][80]. This contribution either survives at high T for BSCCO [18,46] or flattens out for La 2−x Sr x CuO 4 [25].…”

Section: Theorymentioning

confidence: 95%

Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves

Ekino

Gabovich

et al. 2008

J. Phys.: Condens. Matter

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Temperature, T, variations of the tunnel conductance G(V) were calculated for junctions between a normal metal and a spatially inhomogeneous superconductor with a dielectric gap on the nested sections of the Fermi surface or between two such superconductors. The dielectric gapping was considered to be a consequence of the charge density wave (CDW) appearance due to the electron–phonon (for a Peierls insulator) or a Coulomb (for an excitonic insulator) interactions. Spatial averaging was carried out over random domains with varying parameters of the CDW superconductor (CDWS). The calculated tunnel spectra demonstrate a smooth transformation from asymmetric patterns with a pronounced dip–hump structure at low T into those with a pseudogap depletion of the electron densities of states at higher T in the vicinity or above the actual critical temperatures of the superconducting transition for any of the CDWS domains. Thus, it is demonstrated that both the dip-hump structure and pseudogapping are manifestations of the same phenomenon. A possible CDW-induced asymmetry of the background contribution to G(V) is also touched upon. The results explain the peculiar features of G(V) for Bi2Sr2CaCu2O8+δ and other related high-Tc cuprates.

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Section: Theorymentioning

confidence: 95%

Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves

Ekino

Gabovich

et al. 2008

J. Phys.: Condens. Matter

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Tunneling spectroscopic measurement in lanthanide substituted Bi2Sr2CuO6+δ

Cited by 1 publication

References 6 publications

Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves

Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves

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Tunneling spectroscopic measurement in lanthanide substituted Bi2Sr2CuO6+δ

Cited by 1 publication

References 6 publications

Temperature-dependent pseudogap-like features in tunnel spectra of high-Tccuprates as a manifestation of charge-density waves

Temperature-dependent pseudogap-like features in tunnel spectra of high-Tccuprates as a manifestation of charge-density waves

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Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves

Temperature-dependent pseudogap-like features in tunnel spectra of high-T_ccuprates as a manifestation of charge-density waves