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Tai, M. F.; Chang, Guo‐En; Lee, M. W.

doi:10.1103/physrevb.52.1176

Cited by 13 publications

(2 citation statements)

References 34 publications

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“…These results are shown in figure 12. Later, similar results for K 3 C 60 powder [177,182] and Rb 3 C 60 [177] were obtained with n = 1.3-5. This temperatue dependence was confirmed by measurements on singlecrystalline K 3 C 60 [146] and Rb 3 C 60 [169].…”

Section: Critical Current Densitysupporting

confidence: 64%

Magnetic properties of fullerene superconductors

Buntar¹,

Weber²

1996

Supercond. Sci. Technol.

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A review of the superconducting magnetic properties of doped fullerenes is presented. Experimental results on the main superconducting properties, such as the critical fields and the characteristic lengths, are critically discussed. Different methods to evaluate the lower critical field are discussed. Finally, experimental data on properties connected to flux pinning, such as the critical current density, the irreversibility line and the pinning force, are summarized and discussed.

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Section: Critical Current Densitysupporting

confidence: 64%

Magnetic properties of fullerene superconductors

Buntar¹,

Weber²

1996

Supercond. Sci. Technol.

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“…Despite this we previously used Eq. 2 to analyse the magnetization critical current density, J c,m (T, B ≈ 0), for PrOs 4 Sb 12 [23] and for Rb 3 C 60 [24]. The derived parameters, λ(0) and ∆(0) are in excellent agreement with reported values [17], and the test in the present instance is whether the resulting parameters are reasonable.…”

supporting

confidence: 72%

London penetration depth and thermal fluctuations in the sulphur hydride 203 K superconductor

et al. 2016

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Recently, compressed H 2 S has been shown to become superconducting at 203 K under a pressure of 155 GPa. One might expect fluctuations to dominate at such temperatures. Using the magnetisation critical current, we determine the ground-state London penetration depth, λ 0 =189 nm, and the superconducting energy gap, 0 =27.8 meV, and find these parameters are similar to those of cuprate superconductors. We also determine the fluctuation temperature scale, T fluc = 1470 K, which shows that, unlike the cuprates, T c of the hydride is not limited by fluctuations. This is due to its three dimensionality and suggests the search for better superconductors should refocus on threedimensional systems where the inevitable thermal fluctuations are less likely to reduce the observed T

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Collinear QCD Models

Dalley

1998

New Non-Perturbative Methods and Quantization on the Light Cone

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In ancient times, 't Hooft studied the mesons in QCD 1+1 [1] to illustrate the power of the large N limit [2] in the light-cone formalism. Recently some generalisations of the 't Hooft model have been studied, which retain a remnant of transverse degrees of freedom, based on a dimensional reduction of QCD to 1+1 dimensions [3,4,5,6,7,8,9]. In this collinear approximation, quarks and gluons are artificially restricted to move in one space dimension, but retain their polarization degree of freedom. In this lecture, a problem which in principle involves a large number of partons will be addressed in the context of the collinear model at large N . For light-cone quantisation, large numbers of partons are synonymous with small Bjorken-x. The example treated here 3 is the quark distribution function in a heavy meson, which is supposed to exhibit a version of Regge behaviour at small-x. The central idea involves high light-cone energy boundary conditions on wavefunctions -ladder relationswhich typically connect Fock space sectors of differing numbers of partons. The same ideas carry over to 3 + 1 dimensions [10].We start from SU (N ) gauge theory in 3 + 1-dimensions with one flavour of quarks. If we pick an arbitrary fixed space direction x 3 and restrict ourselves to zero momentum in the transverse directionsfor the gauge and quark fields, one finds an effectively two-dimensional gauge theory of adjoint scalars and fundamental Dirac spinors with action], D a = ∂ a + iA a , dx 1 dx 2 = L 2 , g 2 =g 2 /L 2 , andg is the four-dimensional coupling. The twocomponent spinors u and v are related to Ψ by

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Vortex-lattice melting in superconducting fullereneRb3C60

Cited by 13 publications

References 34 publications

Magnetic properties of fullerene superconductors

Magnetic properties of fullerene superconductors

London penetration depth and thermal fluctuations in the sulphur hydride 203 K superconductor

Collinear QCD Models

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