A brief comparison of superconductivity in borocarbides and cuprates

Drechsler, S.‐L.; Rösner, H.; Shulga, S. V.; Opahle, Ingo; Eschrig, H.; Freudenberger, J.; Fuchs, G.; Nenkov, K.; Müller, K.‐H.; Bitterlich, H.; Löser, W.; Behr, G.; Lipp, D.; Gladun, A.

doi:10.1016/s0921-4534(01)00719-5

Cited by 16 publications

(13 citation statements)

References 14 publications

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“…given above including also our recent data presented at two international conferences SCES'04 and M2S-HTSC-VIII [17,18]. Additionally, to explain our findings with respect to the SC gap we provide support for the separation of magnetism and superconductivity on different Fermi surface sheets in magnetic borocarbides [5,6,8].…”

Section: Introductionsupporting

confidence: 79%

“…their coexistence on different Fermi surface sheets (FSS), proposed in Refs. [5,6,8]. In other words, we suggest that the superconductivity in the commensurate antiferromagnetic phase survives only at a special (nearly isotropic) FSS with no admixture of Ho 5 d states.…”

Section: Pcs Of the Sc Energy Gap In The Commensurate Antiferromagnetmentioning

confidence: 70%

“…On the other hand for the magnetically ordered borocarbide superconductors the role of the crystal-electric-field (CEF) splitting of the 4f -shell states of the R +3 ion and their excitations are of fundamental importance to understand both ordering phenomena. Additionally, the el-ph interaction responsible for the SC state in these compounds has also been analyzed within the multiband Eliashberg theory [3,4] with emphasis on the complex Fermi surface with different contribution to the SC state by different orbitals on different Fermi surface sheets [4,5,6,7,8].…”

Section: Introductionmentioning

confidence: 99%

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Point-contact spectroscopy of the antiferromagnetic superconductorHoNi2B2Cin the normal and superconducting state

et al. 2007

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Point-contact (PC) spectroscopy measurements on antiferromagnetic (AF) (TN ≃5.2 K) HoNi2B2C single crystals in the normal and two different superconducting (SC) states (Tc ≃8.5 K and T * c ≃ 5.6 K) are reported. The PC study of the electron-boson(phonon) interaction (EB(P)I) spectral function reveals pronounced phonon maxima at 16, 22 and 34 meV. For the first time the high energy maxima at about 50 meV and 100 meV are resolved. Additionally, an admixture of a crystalline-electric-field (CEF) excitations with a maximum near 10 meV and a 'magnetic' peak near 3 meV are observed. The contribution of the 10-meV peak in PC EPI constant λPC is evaluated as 20-30%, while contribution of the high energy modes at 50 and 100 meV amounts about 10% for each maxima, so the superconductivity might be affected by CEF excitations. The SC gap in HoNi2B2C exhibits a standard single-band BCS-like dependence, but vanishes at T * c ≃ 5.6 K< Tc, with 2∆/kBT * c ≃ 3.9. The strong coupling Eliashberg analysis of the low-temperature SC phase with T * c ≃ 5.6 K ∼ TN, coexisting with the commensurate AF structure, suggests a sizable value of the EPI constant λs ∼ 0.93. We also provide strong support for the recently proposed by us "Fermi surface (FS) separation" scenario for the coexistence of magnetism and superconductivity in magnetic borocarbides, namely, that the superconductivity in the commensurate AF phase survives at a special (nearly isotropic) FS sheet without an admixture of Ho 5d states. Above T * c the SC features in the PC characteristics are strongly suppressed pointing to a specific weakened SC state between T * c and Tc.

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Section: Introductionsupporting

confidence: 79%

Section: Pcs Of the Sc Energy Gap In The Commensurate Antiferromagnetmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Point-contact spectroscopy of the antiferromagnetic superconductorHoNi2B2Cin the normal and superconducting state

et al. 2007

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“…The boron isotope effect found in YNi 2 B 2 C ( B = 0.2) and LuNi 2 B 2 C ( B = 0.11) is much smaller than the BCS value X = 0.5. A nonphononic origin stemming from the influence of boron on the charge density in the B 2 Ni 2 layers has therefore been suggested [426]. The most direct support for phononmediated Cooper pairing comes from scanning tunneling spectroscopy ("STS") [427] which has shown the existence of a strong coupling signature in the tunneling DOS due to a soft optical phonon close to the Fermi surface nesting wave vector Q.…”

Section: Borides and Borocarbidesmentioning

confidence: 99%

Superconducting Materials — A Topical Overview

Hott¹,

Kleiner

Wolf³

et al.

Frontiers in Superconducting Materials

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“…The boron isotope effect found in YNi 2 B 2 C (α B = 0.2) and LuNi 2 B 2 C (α B = 0.11) is much smaller than the BCS value α X = 0.5. A nonphononic origin stemming from the influence of boron on the charge density in the B 2 Ni 2 layers has therefore been suggested [359]. The most direct support for phononmediated Cooper pairing comes from scanning tunneling spectroscopy ("STS") [360] which has shown the existence of a strong coupling signature in the tunneling DOS due to a soft optical phonon close to the Fermi surface nesting wave vector Q.…”

Section: Borides and Borocarbidesmentioning

confidence: 99%

Review on Superconducting Materials

Hott

Kleiner

Wolf

et al. 2016

Digital Encyclopedia of Applied Physics

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The article contains sections titled: Introduction Cuprate High‐Temperature Superconductors Other Oxide Superconductors Iron‐Based Superconductors Other Chalcogenide Superconductors Heavy Fermion Superconductors Nitride Superconductors Organic and Other Carbon‐ and Silicon‐Based Superconductors Borides and Borocarbides

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A brief comparison of superconductivity in borocarbides and cuprates

Cited by 16 publications

References 14 publications

Point-contact spectroscopy of the antiferromagnetic superconductorHoNi2B2Cin the normal and superconducting state

Point-contact spectroscopy of the antiferromagnetic superconductorHoNi2B2Cin the normal and superconducting state

Superconducting Materials — A Topical Overview

Review on Superconducting Materials

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