Thermodynamic and Transport Properties of Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Mg</mml:mi></mml:mrow><mml:mrow><mml:mn>10</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Finnemore, D. K.; Ostenson, J. E.; Bud’ko, Sergey L.; Lapertot, G.; Canfield, Paul C.

doi:10.1103/physrevlett.86.2420

Cited by 493 publications

(444 citation statements)

References 4 publications

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“…4 compares the J c (B) variations of our samples for T ≥ 33 K. The undoped tape (Fig. 4a) shows approximately exponential J c (B) variation, which is typical for MgB 2 samples [2,10,14,20]. At low temperatures (high I c ), large self-field µ 0 H s (H s ≃ I c /c, where c is the circumference of the core) makes J c (B < µ 0 H s ) nearly constant, whereas at elevated fields (B → B irr ) J c rapidly decreases to zero.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, the simple preparation and rather high critical currents J c of composite MgB 2 tapes and wires [4,6,7,8,9] lend strong support to these expectations. Unfortunately, compared to practical LTS (NbTi, Nb 3 Sn), MgB 2 exhibits weak flux-pinning [2,10], which results in strong field dependence of J c and a low irreversibility field B irr (4.2 K) ≈ 8 T [2].…”

Section: Introductionmentioning

confidence: 99%

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Correlated vortex pinning in Si-nanoparticle doped MgB2

Kušević

Babić

Husnjak

et al. 2004

Solid State Communications

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The magnetoresistivity and critical current density of well characterized Si-nanoparticle doped and undoped Cu-sheathed MgB2 tapes have been measured at temperatures T ≥ 28 K in magnetic fields B ≤ 0.9 T. The irreversibility line Birr(T ) for doped tape shows a stepwise variation with a kink around 0.3 T. Such Birr(T ) variation is typical for high-temperature superconductors with columnar defects (a kink occurs near the matching field B φ ) and is very different from a smooth Birr(T ) variation in undoped MgB2 samples. The microstructure studies of nanoparticle doped MgB2 samples show uniformly dispersed nanoprecipitates, which probably act as a correlated disorder. The observed difference between the field variations of the critical current density and pinning force density of the doped and undoped tape supports the above findings.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correlated vortex pinning in Si-nanoparticle doped MgB2

Kušević

Babić

Husnjak

et al. 2004

Solid State Communications

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“…The recent discovery of intermediate-temperature superconductivity (ITC) in MgB2 by Akimitsu et al 1 and its almost simultaneous explanation in terms of a hole-carrier-based pairing mechanism by Hirsch 2, 3 has triggered an avalanche of studies of its structural, magnetic and transport properties 4,5,6,7,8 . In spite of the significant advancement made on critical current density of HTS conductors the best transport J c of Ag/Bi2223 tapes is still limited by the grain connectivity.…”

Section: Introductionmentioning

confidence: 99%

Flux jumping and a bulk-to-granular transition in the magnetization of a compacted and sintered MgB2 superconductor

Dou

Wang

Horvat

et al. 2001

Physica C: Superconductivity

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In this letter, we report the results of field (H) and temperature (T) dependent magnetization (M) measurements of a pellet of uniform, large-grain sintered MgB 2 . We show that at low temperatures the size of the pellet and its critical current density, J c (H) --i.e. its M(H) --ensure low field flux jumping, which of course ceases when M(H) drops below a critical value. With further increase of H and T the individual grains decouple and the M(H) loops drop to lower lying branches, unresolved in the usual full M(H) representation. After taking into account the sample size and grain size, respectively, the bulk sample and the grains were deduced to exhibit the same magnetically determined J c s (e.g. 10 5 A/cm 2 , 20 K, 0T) and hence that for each temperature of measurement J c (H) decreased monotonically with H over the entire field range, except for a gap within the grain-decoupling zone.

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“…Unlike cuprate high-temperature superconductors, MgB 2 seems to be a phonon-mediated superconductor [15] with a relatively long coherence length [16].…”

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confidence: 99%

In situ epitaxial MgB2 thin films for superconducting electronics

Zeng¹,

Pogrebnyakov²,

Kotcharov³

et al. 2002

Nature Mater

390

307

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A thin film technology compatible with multilayer device fabrication is critical for exploring the potential of the 39-K superconductor magnesium diboride for superconducting electronics. Using a Hybrid Physical-Chemical Vapor Deposition (HPCVD) process, it is shown that the high Mg vapor pressure necessary to keep the MgB 2 phase thermodynamically stable can be achieved for the in situ growth of MgB 2 thin films. The films grow epitaxially on (0001) sapphire and (0001) 4H-SiC substrates and show a bulk-like T c of 39 K, a J c (4.2K) of 1.2 × 10 7 A/cm 2 in zero field, and a H c2 (0) of 29.2 T in parallel magnetic field. The surface is smooth with a root-mean-square roughness of 2.5 nm for MgB 2 films on SiC. This deposition method opens tremendous opportunities for superconducting electronics using MgB 2 .

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Thermodynamic and Transport Properties of SuperconductingMg10B2

Cited by 493 publications

References 4 publications

Correlated vortex pinning in Si-nanoparticle doped MgB2

Correlated vortex pinning in Si-nanoparticle doped MgB2

Flux jumping and a bulk-to-granular transition in the magnetization of a compacted and sintered MgB2 superconductor

In situ epitaxial MgB2 thin films for superconducting electronics

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