Microstructure and pinning properties of hexagonal-disc shaped single crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MgB</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Jung, C. U.; Kim, J. Y.; Chowdhury, P.; Kim, Kijoon H. P.; Lee, Sung Ik; Koh, Duk Su; Tamura, Nobumichi; Caldwell, Wendel A.; Patel, J. R.

doi:10.1103/physrevb.66.184519

Cited by 21 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…28,29 Briefly, a 1:1 mixture of Mg and amorphous B powders was well ground and pressed into a pellet. The pellet was put in a BN container and then placed in a high-pressure cell equipped with a graphite heater.…”

Section: Methodsmentioning

confidence: 99%

Reversible magnetization ofMgB2single crystals with a two-gap nature

et al. 2004

Self Cite

View full text Add to dashboard Cite

We present reversible magnetization measurements on MgB 2 single crystals in magnetic fields up to 2.5 T applied parallel to the crystal's c axis. This magnetization is analyzed in terms of the Hao-Clem model, and various superconducting parameters, such as the critical fields ͓H c (0) and H c2 (0)], the characteristic lengths ͓͑0͒ and ͑0͔͒, and the Ginzburg-Landau parameter, are derived. The temperature dependence of the magnetic penetration depth (T), obtained from the Hao-Clem analysis, could not be explained by theories assuming a single gap. Our data are well described by using a two-gap model.

show abstract

Section: Methodsmentioning

confidence: 99%

Reversible magnetization ofMgB2single crystals with a two-gap nature

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…For T 10 K, the influence of the small gap is smeared out by the temperature and C p =T fB=B c2 T; . Specific heat measurements have been performed on single crystals of MgB 2 grown under high pressure [7,8] (with typical dimensions of few hundred microns) using an ac technique. This high sensitivity technique is very well adapted to measure C p of very small samples and to carry continuous measurements during field sweeps at a given temperature.…”

mentioning

confidence: 99%

Anisotropy of the Sommerfeld Coefficient in Magnesium Diboride Single Crystals

Klein¹,

Marcus²,

Marcenat³

et al. 2007

Phys. Rev. Lett.

View full text Add to dashboard Cite

The anisotropic field dependence of the Sommerfeld coefficient gamma has been measured down to B-->0 by combining specific heat and Hall probe magnetization measurements in MgB2 single crystals. We find that gamma(B,theta) is the sum of two contributions arising from the sigma and pi band, respectively. We show that gammasigma(B,theta)=B/Bc2(theta) where Bc2(theta)=Bc2ab/sqrt[sin2theta+Gamma2cos2theta] with Gamma approximately 5.4 (theta being the angle between the applied field and the c axis) and gammapi(B,theta)=gammapi(B)=B/Bpi(B). The "critical field" of the pi band Bpi is fully isotropic but field dependent increasing from approximately 0.25 T for B< or =0.1 T up to 3 T approximately Bc2c for B-->3 T. Because of the coupling of the two bands, superconductivity survives in the pi band up to 3 T but is totally destroyed above for any orientation of the field.

show abstract

“…Moreover, MgB 2 crystals typically have small critical current densities j c $ 4 Â 10 8 Am À2 (at 4 K and H a ! 0 [9]) emphasizing the small amount of native disorder. Then, the Bragg Glass should occupy the largest part of the H-T phase diagram.…”

mentioning

confidence: 99%