Einflu� der Kondensation bei tiefen Temperaturen auf den elektrischen Widerstand und die Supraleitung f�r verschiedene Metalle

Buckel, W.; Hilsch, R.

doi:10.1007/bf01337903

Cited by 549 publications

(126 citation statements)

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“…Under pressure, bismuth transforms stepwise into several other structures and becomes metallic and superconducting, thus mimicking the behaviour of tellurium. A puzzling fact created quite an excitement, namely that deposition of bismuth from the gas phase on to a helium cooled substrate produced an amorphous 6 K superconductor which upon warming to 20 K recrystallized with loss of superconductivity [20]. The case of bismuth nicely illustrates the interaction of the metal atom matrix and the electronic system with its delicate balance between pair localization and itinerancy.…”

Section: Element Superconductormentioning

confidence: 99%

Superconductivity and the periodic table: from elements to materials

Simon

2015

Phil. Trans. R. Soc. A.

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Based on the normal-state electronic band structure, the necessary condition for a metal to become a superconductor is the simultaneous occurrence of flat and steep bands at the Fermi level. The sufficient condition at least for conventional superconductors is a strong enough coupling of the flat band states to the lattice, e.g. via phonons. Selected elements (Te) and compounds of the rare earth metals ( RE 2 C 3 , REC 2 , RE 2 X 2 C 2 with X =halogen) and MgB 2 serve as examples to illustrate the idea.

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Section: Element Superconductormentioning

confidence: 99%

Superconductivity and the periodic table: from elements to materials

Simon

2015

Phil. Trans. R. Soc. A.

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“…After the recent observations of superconductivity in BiOCuS 6 and doped LaCo 2 B 2 7 , it is a pertinent question to ask if CuS and CoB could also play the same role as of CuO 2 and FeAs. In this regards, it is worth mentioning that although superconductivity of BiOCuS could not be reproduced 10 17,18 , while some other phases are found to be superconducting [19][20][21][22][23] . Various crystallographic phases of pure Bi, which are superconducting in the bulk phase, are Bi II, III and V (high-pressure phases of Bi) with T c = 3.9K, 7.2K, and 8.5K [19][20][21] respectively.…”

mentioning

confidence: 99%

“…Various crystallographic phases of pure Bi, which are superconducting in the bulk phase, are Bi II, III and V (high-pressure phases of Bi) with T c = 3.9K, 7.2K, and 8.5K [19][20][21] respectively. The fcc Bi phase superconducts with T c ~ 4K 22 ; and amorphous Bi with T c = 6K 23 .…”

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confidence: 99%

Bulk Superconductivity in Bismuth Oxysulfide Bi₄O₄S₃

et al. 2012

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Very recent report 1 on observation of superconductivity in Bi 4 O 4 S 3 could potentially reignite the search for superconductivity in a broad range of layered sulfides. We report here synthesis of Bi 4 O 4 S 3 at 500 0 C by vacuum encapsulation technique and its basic characterizations. Bi 4 O 4 S 3 is contaminated by small amounts of Bi 2 S 3 and Bi impurities. The majority phase is tetragonal I4/mmm space group with lattice parameters a = 3.9697(2)Å, c = 41.3520(1)Å. Both AC and DC magnetization measurements confirmed that Bi 4 O 4 S 3 is a bulk superconductor with superconducting transition temperature (T c ) of 4.4K. Isothermal magnetization (MH) measurements indicated closed loops with clear signatures of flux pinning and irreversible behavior. The lower critical field (H c1 ) at 2K, of the new superconductor is found to be ~15 Oe. The magneto-transport R(T, H) measurements showed a resistive broadening and decrease in T c (ρ=0) to lower temperatures with increasing magnetic field. The extrapolated upper critical field H c2 (0) is ~ 31kOe with a corresponding Ginzburg-Landau coherence length of ~100Å . In the normal state the ρ ~ T 2 is not indicated. Hall resistivity data show non-linear magnetic field dependence. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi 4 O 4 S 3 . On the other hand same temperature heat treated Bi is not superconducting, thus excluding possibility of impurity driven superconductivity in the newly discovered Bi 4 O 4 S 3 superconductor.

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“…Since the experiments of Buckel and Hilsch [11] it is well-known that shifted transition temperatures T~ in superconductors can be produced by lattice disorder and particle size effects. In these experiments metal films with high disorder were made by evaporation onto substrates held at liquid-helium temperatures.…”

Section: A Aluminiummentioning

confidence: 99%

Measurements of effective quasiparticle recombination times and of densities of electronic states at the Fermi level in superconducting Al- and Pb-films

Epperlein

Eisenmenger

1979

Z Physik B

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Temperature-dependent quasiparticle recombination lifetimes -Cexp(r ) and densities N o of electronic states at the Fermi level have been measured from time decay experiments of excess quasiparticle concentrations in evaporated, superconducting A1-and Pb-tunnel junctions. Current pulses were used to inject excess, nonthermal quasiparticles in a single junction acting simultaneously as generator and detector. The experimental lifetimes in "unperturbed" A1 show satisfactory agreement with calculations based on the 2A-phonon trapping lifetime model. Zexp decreases with increasing perturbations of the A1 film structure by oxygen background evaporation. In Pb the measured times indicate 2A-phonon volume losses. The densities N o in Pb-films and "unperturbed" as well as oxygen-perturbed Al-films differ by less than 5 % from the corresponding bulk material data. Therefore, in trying to explain the enhancement of the transition temperature from 1.23 K to 1.85 K in perturbed, granular Al-films a change of N o can be ruled out.

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Einflu� der Kondensation bei tiefen Temperaturen auf den elektrischen Widerstand und die Supraleitung f�r verschiedene Metalle

Cited by 549 publications

References 0 publications

Superconductivity and the periodic table: from elements to materials

Superconductivity and the periodic table: from elements to materials

Bulk Superconductivity in Bismuth Oxysulfide Bi₄O₄S₃

Measurements of effective quasiparticle recombination times and of densities of electronic states at the Fermi level in superconducting Al- and Pb-films

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Einflu� der Kondensation bei tiefen Temperaturen auf den elektrischen Widerstand und die Supraleitung f�r verschiedene Metalle

Cited by 549 publications

References 0 publications

Superconductivity and the periodic table: from elements to materials

Superconductivity and the periodic table: from elements to materials

Bulk Superconductivity in Bismuth Oxysulfide Bi4O4S3

Measurements of effective quasiparticle recombination times and of densities of electronic states at the Fermi level in superconducting Al- and Pb-films

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Bulk Superconductivity in Bismuth Oxysulfide Bi₄O₄S₃