Equilibrium basal-plane magnetization of superconductive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YNi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mo>:</mml:mo></mml:math>The influence of nonlocal ele

Thompson, James R.; Silhanek, Alejandro; Civale, L.; Song, Kyu Jeong; Tomy, C. V.; Paul, D. McK.

doi:10.1103/physrevb.64.024510

Cited by 8 publications

(8 citation statements)

References 21 publications

(49 reference statements)

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“…Following the procedure shown by Thompson et al for borocarbide superconductors 33 we have evaluated the reversible magnetizations. The reversible magnetization as a function of field for H͉͉c and H͉͉ab at various temperatures is shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic vortex pinning in the layered intermetallic superconductor CaAlSi

et al. 2003

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We have studied anisotropic magnetic properties of layered intermetallic superconductor CaAlSi with moderate anisotropy. Near the upper critical field there is a prominent peak effect for H͉͉c at low temperatures and it becomes weaker for H͉͉ab. The estimated correlation length L c suggests the presence of three-dimensional collective pinning around the peak effect. The critical current densities for H͉͉c and H͉͉ab have been extracted and compared. Flux pinning mechanism in CaAlSi is anisotropic. Collective core pinning is observed for H͉͉c whereas there is a signature of deviation from it for H͉͉ab. The vortex phase diagram, including the upper critical field, irreversibility field, and peak field, has been studied. The thermodynamic critical field and Ginzburg-Landau parameter have been estimated from the equilibrium magnetization. The nature of scaling of the maximum pinning force densities with the thermodynamic critical field has been discussed. The temperature dependence of London penetration depth is consistent with single fully gapped state in CaAlSi.

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Section: Resultsmentioning

confidence: 99%

Anisotropic vortex pinning in the layered intermetallic superconductor CaAlSi

et al. 2003

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“…It corresponds to a rare-earth impurity content of 0.1 at. % relative to Y, probably due to contaminants in the Y starting material 24 . The Lu(Ni 1−x Co x ) 2 B 2 C crystals, grown as described elsewhere 33 , show a much weaker Curie tail at low temperatures (T < 100K) which might arise, for example, from a 0.001% magnetic impurities of Gd in the Lu site 33 .…”

Section: Methodsmentioning

confidence: 99%

“…As we pointed out in ref. 32 , the large out-of-plane F p anisotropy sharply contrasts with the very small (< 10%) mass anisotropy 24,26,25 . Therefore, explanations based on the anisotropic scaling frequently used in high T c superconductors 39 are ruled out.…”

Section: B Out-of-plane Anisotropymentioning

confidence: 99%

“…The Y-0 crystal is the same one that was previously investigated in Refs. 23,24,26,27,32 . The normal state magnetization follows a Curie law that indicates the presence of a very dilute distribution of localized magnetic moments.…”

Section: Methodsmentioning

confidence: 99%

“…Later on, Song et al 23 found similar deviations in YNi 2 B 2 C when H c-axis, that could also be quantitatively accounted for by the model. Recently we have extended that study to all directions of H and showed that this generalization of the London theory provides a satisfactory complete description of the anisotropic M (H) with a self-consistent set of parameters 24 .…”

Section: Introductionmentioning

confidence: 99%

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On The Influence of a Non-Local Electrodynamics in the Irreversible Magnetization of Non-Magnetic Borocarbides

Silhanek

Civale

Thompson

et al. 2002

New Trends in Superconductivity

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We present an overview of the temperature, field and angular dependence of the irreversible magnetization of non-magnetic borocarbides (Y;Lu)Ni2B2C. We show that nonlocal electrodynamics influences pinning via the unusual behavior of the shear modulus in non-hexagonal lattices. On top of that, we observe that the pinning force density Fp exhibits a rich anisotropic behavior that sharply contrasts with its small mass anisotropy. When H⊥c, Fp is much larger and has a quite different H dependence, indicating that other pinning mechanisms are present.

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Self‐assembled quantum dots as a source of single photons and photon pairs

Shields

Stevenson

Thompson

et al. 2003

Physica Status Solidi (b)

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PACS 78.67.Hc We investigate the emission from a single self-organised InAs/GaAs quantum dots as a potential single or pair photon source. Single photon emission is stimulated by exciting the dot with ps laser pulses and collecting either the exciton or biexciton emission line. A more convenient and practical arrangement is to excite the quantum dot electrically by growing it inside a p -i -n structure. Photon pairs are generated through collecting both the exciton and biexciton emissions. We show a strong correlation in the emission times of the exciton and biexciton photon from the dot, as well as in their linear polarisations.1 Introduction Single photon sources are a building block for many experiments in quantum optics, as well as photonic implementations of quantum computing [1, 2] and communication [3]. In quantum cryptography, for instance, a cryptographic key can be formed between two parties using bits encoded upon single photons transmitted along an optical fibre or through free space. By using single photons the sender and intended recipient are able to guarantee the security of their key, since quantum mechanics dictates that measurement by a third party will inevitably produce a detectable change to the encoded single photons. The secrecy of the key is difficult to achieve when using a weak pulsed laser diode, because of the unavoidable multi-photon pulses [4]. Thus the development of a true single photon source is vital for unconditional security of quantum cryptography.The first proposal to create a quantum light source was based upon the resonance fluorescence of a single two-level atom, using the fact that the emission of a photon returns the atom to its ground state, after which it must be re-excited before a second photon can be emitted [5]. This was first demonstrated experimentally in the resonance fluorescence of a low-density vapour of Na atoms [6], although the behaviour was complicated by the fact that the emission of a single atom could not be isolated. Later experiments on a single trapped Mg + ion showed a more ideal demonstration of anti-bunching [7]. In recent years, the photon emission statistics of a wide range of other quantised, two level systems have been studied, such as single molecules, CdSe/ZnS nanocrystals and nitrogen vacancy centres in diamond, see Ref.[8] for a list of references.A quantum dot is often described as the semiconductor analogue of an atom, since the three dimensional confinement of the electrons results in their energy spectrum consisting of a series of discrete lines. Each of these levels can accommodate just two electrons of different spin, due to the Pauli exclusion principle. It was proposed that a quantum dot formed by etching a lithographically defined pillar in a heterojunction could be used to make a device for emitting single photons [9]. However, the small

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Equilibrium basal-plane magnetization of superconductiveYNi2B2C:The influence of nonlocal ele

Cited by 8 publications

References 21 publications

Anisotropic vortex pinning in the layered intermetallic superconductor CaAlSi

Anisotropic vortex pinning in the layered intermetallic superconductor CaAlSi

On The Influence of a Non-Local Electrodynamics in the Irreversible Magnetization of Non-Magnetic Borocarbides

Self‐assembled quantum dots as a source of single photons and photon pairs

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