Crystal growth and perfection of RENi2B2C (RE=Ho, Tb, Y)

Souptel, D.; Behr, G.; Löser, W.; Nenkov, K.; Fuchs, G.

doi:10.1016/j.jcrysgro.2004.10.143

Cited by 14 publications

(26 citation statements)

References 25 publications

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“…As mentioned in Ref. 19 crystallographically oriented thin plates of the nonsuperconducting HoNiBC compound have been observed in selected parts of as-grown HoNi 2 B 2 C crystals. It is well-known that the 1:1:1:1 compound HoNiBC exhibits long-range magnetic order below T N ≃10 K [31].…”

Section: 'Magnetic' Peakmentioning

confidence: 57%

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: 'Magnetic' Peakmentioning

confidence: 57%

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

et al. 2007

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“…Rodlike TbNi 2 B 2 C single crystals were grown by the floating zone method using 11 B isotope to avoid strong neutron absorption [20]. Specimens with a length of 6 mm were cut from the rods with 6 mm diameter.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of low-energy phonons in magnetic nonsuperconducting TbNi2B2C

et al. 2011

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We report temperature dependence of low-energy phonons in magnetic nonsuperconducting TbNi2B2C single crystals measured by inelastic neutron scattering. We observed low-temperature softening and broadening of two phonon branches, qualitatively similar to that previously reported for superconducting RNi2B2C (R = rare earth, Y ) compounds. This result suggests that superconductivity in TbNi2B2C compounds is absent not because of weak electron-phonon coupling but as a result of pair breaking due to magnetism.

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“…Single crystals of RNi 2 [B 2 C] with R ¼ Pr, Tb, Dy, and Ho few mm in size were grown by a cold crucible method using RF-heating [51]. Larger crystals of high quality (low widths of superconducting transition temperature and magnetic ordering temperatures, if applicable) with R ¼ Y, Pr, Tb, Ho and M ¼ Ni were grown by RF-zone melting from polycrystalline materials [38][39][40][52][53][54][55]. This technique was also suitable for crystals of solid solution phases with two different rare-earth metals [56].…”

Section: Borocarbides Rm 2 [B 2 C] and Rm[bc]mentioning

confidence: 99%

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Niewa¹,

Shlyk²,

Blaschkowski

2011

Zeitschrift Für Kristallographie

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Abstract. Few years after the discovery of superconductivity in high-T c cuprates, borocarbides and shortly after nitridoborates with reasonably high T c s up to about 23 K attracted considerable attention. Particularly for the rareearth metal series with composition RNi 2 [B 2 C] it turned out, that several members exhibit superconductivity next to magnetic order with both T c above or below the magnetic ordering temperature. Therefore, these compounds have been regarded as ideal materials to study the interplay and coexistence of superconductivity and long range magnetic order, due to their comparably high ordering temperatures and similar magnetic and superconducting condensation energies. This review gathers information on the series

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Crystal growth and perfection of RENi2B2C (RE=Ho, Tb, Y)

Cited by 14 publications

References 25 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

Temperature dependence of low-energy phonons in magnetic nonsuperconducting TbNi2B2C

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

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