Phenomenon of Superconductivity

Poole, Charles P.; Farach, Horácio A.; Creswick, R. J.

doi:10.1016/b978-012088761-3/50024-7

Cited by 144 publications

(227 citation statements)

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“…On the other hand, the local magnetic induction b has an extremely complicated spatial dependence. 1,2, [22][23][24][25][26] As revealed by magneto-optical observations, the magnetic structure for f n 1 can be described crudely as an array of isolated normal domains or flux tubes carrying magnetic flux Φ = N φ 0 , i.e., containing an integer number N of superconducting flux quanta φ 0 = h/2e, surrounded by superconducting regions. The radius r of such a domain is given by Φ = B c πr 2 .…”

Section: Models For the Magnetic Structure In The Intermediate Smentioning

confidence: 99%

“…For further background we refer the reader to several books and reviews. [22][23][24][25][26] Our main interest here is a superconducting slab or oblate ellipsoid with thickness much greater than the coherence length or the London penetration depth in the intermediate state, which we assume consists of normal domains of constant magnetic flux density and superconducting domains of zero flux density. The macroscopic Helmholtz free energy density relative to that in the Meissner state (accounting for both the condensation-energy and fieldenergy costs) is F(B) = B c B/µ 0 , where H c = B c /µ 0 is the bulk thermodynamic critical field and B is the average magnetic flux density in the sample.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Clem

Prozorov²,

Wijngaarden³

2013

Phys. Rev. B

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The equilibrium topology of superconducting and normal domains in flat type-I superconductors is investigated. Important improvements with respect to previous work are: (1) the energy of the external magnetic field, as deformed by the presence of superconducting domains, is calculated in the same way for three different topologies, and (2) calculations are made for arbitrary orientation of the applied field. A phase diagram is presented for the minimum-energy topology as a function of applied field magnitude and angle. For small (large) applied fields normal (superconducting) tubes are found, while for intermediate fields parallel domains have a lower energy. The range of field magnitudes for which the superconducting-tubes structure is favored shrinks when the field is more in-plane oriented.

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Section: Models For the Magnetic Structure In The Intermediate Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Clem

Prozorov²,

Wijngaarden³

2013

Phys. Rev. B

Self Cite

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“…2 we show the critical temperature as a function of the parameter P for five values of γ which were chosen to span a wide symmetric range of a values around a = λ 0 . For reference, the interval over which empirical HTSC critical temperatures are found [25,26] is shown between dashed horizontal lines. We note thatT c is a monotonically decreasing function of P but not of γ or λ 0 /a as shown by crossing curves [15] for γ = 1, 10 .…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

Dimensional crossover of a boson gas in multilayers

et al. 2010

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We obtain the thermodynamic properties for a non-interacting Bose gas constrained on multilayers modeled by a periodic Kronig-Penney delta potential in one direction and allowed to be free in the other two directions. We report Bose-Einstein condensation (BEC) critical temperatures, chemical potential, internal energy, specific heat, and entropy for different values of a dimensionless impenetrability P 0 between layers. The BEC critical temperature Tc coincides with the ideal gas BEC critical temperature T0 when P = 0 and rapidly goes to zero as P increases to infinity for any finite interlayer separation. The specific heat CV vs T for finite P and plane separation a exhibits one minimum and one or two maxima in addition to the BEC, for temperatures larger than Tc which highlights the effects due to particle confinement. Then we discuss a distinctive dimensional crossover of the system through the specific heat behavior driven by the magnitude of P . For T < Tc the crossover is revealed by the change in the slope of log CV (T ) and when T > Tc, it is evidenced by a broad minimum in CV (T ).

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“…On the other hand, sample 4 has a smaller magnetization and the ZFC and FC curves remain close while decreasing initially until they start separating at a lower temperature. This shows that the irreversibility temperature, generally related to melting or depinning effects, is different in these samples [28].…”

Section: Resultsmentioning

confidence: 99%

Methodology and search for superconductivity in the La–Si–C system

Venta

Basaran

Grant

et al. 2011

Supercond. Sci. Technol.

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In this paper we describe a methodology for the search for new superconducting materials. This consists of a parallel synthesis of a highly inhomogeneous alloy which covers large areas of the metallurgical phase diagram combined with a fast, microwave-based method which allows non-superconducting portions of the sample to be discarded. Once an inhomogeneous sample containing a minority phase superconductor is identified, we revert to well-known thorough identification methods which include standard physical and structural methods. We show how a systematic structural study helps in avoiding misidentification of new superconducting materials when there are indications from other methods of new discoveries. These ideas are applied to the La-Si-C system which exhibits promising normal state properties which are sometimes correlated with superconductivity. Although this system shows indications for the presence of a new superconducting compound, the careful analysis described here shows that the superconductivity in this system can be attributed to intermediate binary and single phases of the system.

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Phenomenon of Superconductivity

Cited by 144 publications

References 0 publications

Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Equilibrium intermediate-state patterns in a type-I superconducting slab in an arbitrarily oriented applied magnetic field

Dimensional crossover of a boson gas in multilayers

Methodology and search for superconductivity in the La–Si–C system

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