Diamagnetic interactions in disordered suspensions of metastable superconducting granules

Peñaranda, Angelina; Auguet, C.; Ramírez‐Piscina, L.

doi:10.1140/epjb/e20020018

Eur. Phys. J. B

2002

DOI: 10.1140/epjb/e20020018

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Diamagnetic interactions in disordered suspensions of metastable superconducting granules

Angelina Peñaranda¹,

C. Auguet²,

L. Ramírez‐Piscina³

Abstract: The simulation of the transition sequence of superheated Type I superconducting granules (SSG) in disordered suspensions when an external magnetic field is slowly increased from zero has been studied. Simulation takes into account diamagnetic interactions and the presence of surface defects. Results have been obtained for the transition sequence and surface fields distribution covering a wide range of densities. These results are compared with previous analytical perturbative theory, which provides qualitative… Show more

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“…We obtained that the successive transitions induced by the external field are a strong ordering mechanism which produce a more homogeneus distribution of surface magnetic fields of the granules. Consequently, by using this effect, the uncertainty could be reduced in these devices [4,5].Experimentally, a variant of the colloidal device has been developed in response to the spread problem [6]. The microgranules are arrayed on thin planar substrates.…”

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Dynamical ordering induced by preferential transitions in planar arrays of superheated superconducting granules

Peñaranda

Ramírez‐Piscina

2003

Solid State Communications

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We perform simulations of planar arrays of superheated superconducting granules (PASS) under an external magnetic field, analyzing transitions undergone by the system when the external field is slowly increased from zero. We observe, for high concentrations, the existence of an interval of external fields for which no transitions are induced. This effect is analogous to a "hot border zone" identified in the response of Superheated Superconducting Granule detectors. We explain such behaviour as produced by a geometrical ordering dynamically induced in the system by transitions in preferential sites due to diamagnetic interactions. Superheated superconducting granules systems are being developed as detectors in areas such as dark matter, neutrino, neutron, x-ray and transition radiation [1]. An ensemble of spherical granules of a Type I superconductor material is maintained in a metastable superheated state by adequate conditions of temperature and external magnetic field. An increasing of the applied field or the deposition of energy in a microgranule by radiation can produce a transition to the normal state. The change of magnetic flux inherent to the loss of Meissner effect can be sensed by a sensitive magnetometer which provides information about the incident radiation.An early detector was proposed as a disordered colloidal suspension of microgranules in a suitable medium such as paraffin wax [2]. The state of each grain of this suspension in the phase diagram depends, in addition to the external field and temperature, on its metallurgical defects and the diamagnetic interactions of the other grains of the suspension. Metallurgical defects can increase the local magnetic field of the grain and can precipitate the transition to normal state. Diamagnetic interactions depend on the environment of each grain, producing an additional dispersion in the surface magnetic field values. As a consequence of these combined effects, the spread of transitions fields of the suspension reaches values of about 20% that can reduce the resolution of the detector [3].In a previous work we showed that this spreading in transition fields is effectively reduced following an increase in the applied field. We obtained that the successive transitions induced by the external field are a strong ordering mechanism which produce a more homogeneus distribution of surface magnetic fields of the granules. Consequently, by using this effect, the uncertainty could be reduced in these devices [4,5].Experimentally, a variant of the colloidal device has been developed in response to the spread problem [6]. The microgranules are arrayed on thin planar substrates. These Planar Arrays of Superconducting Spheres (PASS) have yielded differential superheating curves in which the spreading is reduced by an order of magnitude.Although the technique of fabrication of this device can only produce arrays of relative small size, it has been shown that the PASS has both good energy and position sensitivity. On the other hand, the avalanche effect, demonstrate...

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Dynamical ordering induced by preferential transitions in planar arrays of superheated superconducting granules

Peñaranda

Ramírez‐Piscina

2003

Solid State Communications

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Preliminary study of the feasibility of a non-crystalline positron emission tomography using a suspension of superheated superconducting grains (SSG) in high-density dielectric matrix (HDDM) as detector

Dawson

Maillard

Maurel³

et al. 2003

Nuclear Instruments and Methods in Physics Research Section A:

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Suspensions of superheated superconducting grains are a detecting composite material. Each grain in the supension is a microcalorimeter with an energy threshold defined by its equatorial magnetic field for a given temperature. The higher the matrix density, the larger the gamma stopping power. For several years, cylindrical cells of such suspensions about 2 cm long and 0.4 mm in diameter can be read out in real time. As a result, using two independent cells, one can record a time coincidence between them. This could be potentially very useful for positron cameras where two diametrically opposite cells are simultaneously knocked by 511 keV gammas. This paper, based on the state of art in SSG in high density matrix, discusses such a feasibility.

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Simulations of transitions in superheated superconducting granules

Peñaranda

Auguet

Ramírez‐Piscina

2004

Nuclear Instruments and Methods in Physics Research Section A:

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Diamagnetic interactions in disordered suspensions of metastable superconducting granules

Cited by 3 publications

References 16 publications

Dynamical ordering induced by preferential transitions in planar arrays of superheated superconducting granules

Dynamical ordering induced by preferential transitions in planar arrays of superheated superconducting granules

Preliminary study of the feasibility of a non-crystalline positron emission tomography using a suspension of superheated superconducting grains (SSG) in high-density dielectric matrix (HDDM) as detector

Simulations of transitions in superheated superconducting granules

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