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Superconducting Regions and Kondo Effect of MgB_2 Formed by Implantation of Magnesium Ions into Boron Substrate

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Trybuła Z., Kempiński W., Andrzejewski B., Piekara-Sady L., Kaszyński J., Trybuła M., Piekoszewski J., Stanisławski J., Barlak M., Richter E.

Acta Physica Polonica A

2006

vol. 109

issue 4-5

657-660

The results of investigation of the polycrystalline boron implanted by magnesium and argon plasma pulse treatment are presented. The four-probe electric conductivity measurements and magnetically modulated microwave absorption showed the presence of superconducting islands below the temperature of 25 K. Below T=23 K we detected the Kondo effect, a logarithmic increase in the resistivity as the temperature is lowered, due to iron impurity.

Ion Implantation and Transient Melting: A New Approach to Formation of Superconducting MgB_2 Phases

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Piekoszewski J., Kempiński W., Stankowski J., Prokert F., Richter E., Stanisławski J., Werner Z., Szymczyk W.

Acta Physica Polonica A

2004

vol. 106

issue 6

861-868

An attempt to synthesize superconducting MgB_2 inter-metallic compound from the liquid state is presented. The process consists of two steps. In the first one, boron ions are implanted into a magnesium substrate. In the second one, the near-surface region of such system is melted by short, intense hydrogen plasma pulses without necessity of annealing in Mg vapor. A magnetically modulated microwave absorption method was used to detect superconducting regions in the obtained MgB_2 layer. Percolation between nano-regions (islands) of MgB_2 has not been observed. However, a superconducting state of the insulated islands has been experimentally proven with transition temperatures T_C as high as 31 K.

Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate

81%

Trybuła Z., Kempiński W., Andrzejewski B., Piekara-Sady L., Kaszyński J., Piekoszewski J., Werner Z., Richter E., Prokert F., Stanisławski J., Barlak M.

Acta Physica Polonica A

2005

vol. 108

issue 1

165-170

The results of investigation of the MgB_2 inter-metallic compound with the use of boron ions implantation and plasma pulse treatment are presented. The samples were characterized by: four-probe electric conductivity measurements, magnetically modulated microwave absorption, and magnetic measurements. For hydrogen and argon pulsed plasma treatment the samples with T_c ranging from 10 K to 32 K were obtained. The superconducting phase does not form a continuous layer since the resistivity does not fall down to zero. Apparently, separate islands of superconducting phase are connected through metallic Mg paths. All samples are still below the percolation threshold.

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3 Acta Physica Polonica A

1 2006

1 2005

1 2004

3 Kempiński W.

3 Piekoszewski J.

3 Richter E.

3 Stanisławski J.

2 Andrzejewski B.

2 Barlak M.

2 Kaszyński J.

2 Piekara-Sady L.

2 Prokert F.

2 Trybuła Z.

2 Werner Z.

1 Stankowski J.

1 Szymczyk W.

1 Trybuła M.

Search results

Superconducting Regions and Kondo Effect of MgB_2 Formed by Implantation of Magnesium Ions into Boron Substrate

Ion Implantation and Transient Melting: A New Approach to Formation of Superconducting MgB_2 Phases

Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate