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Tunneling Conductivity of Manganites with Negative Magnetoresistance

100%

Medvedev Y., Tarenkov V., Svistunov V., Abaloshev A., Abalosheva I., Lewandowski S.

Acta Physica Polonica A

2000

vol. 97

issue 5

827-830

Tunneling investigations of ferromagnetic La_{0.6}Sr_{0.4}MnO_{3} ceramic samples showing negative magnetoresistance effect were carried out in two types of junctions: symmetric "break junctions" and asymmetric ceramics-insulator-metal junctions. The results are consistent with the presence of small ferromagnetic clusters in the insulating barriers of both types of junctions and suggest a two-phase state realized by impurity mechanism of phase separation.

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase

84%

Lewandowski S., Berkowski M., Tarenkov V., D'yachenko A., Abal'oshev A., Abal'osheva I., Gawryluk D., Domukhovski V., Sidorov S., Boichenko D.

issue 2

289-291

We report on measurements of samples with nominal composition FeSe_{0.5}Te_{0.5}, crystallized by the Bridgman method. Magnetic and transport properties of the samples were examined. The measurements confirm the coexistence of ferromagnetism and superconductivity below the superconducting transition temperature. The ferromagnetic contribution to magnetization, estimated at 10%, might be caused by the presence of ferrimagnetic Fe_7Se_8, which occupies about 10% of sample volume. From the Andreev spectroscopy we found superconducting energy gap Δ = 2.6 meV at T = 4.2 K, and from magnetization measurements the critical temperature T_c = 15.8 K. The critical current density in magnetic field H = 4 kOe, determined from magnetization measurements, is j_c = (1-2) × 10^4 A/cm^2 and weakly depends on magnetic field intensity.

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2 Acta Physica Polonica A

1 2010

1 2000

2 Lewandowski S.

2 Tarenkov V.

1 Abal'oshev A.

1 Abal'osheva I.

1 Abaloshev A.

1 Abalosheva I.

1 Berkowski M.

1 Boichenko D.

1 D'yachenko A.

1 Domukhovski V.

1 Gawryluk D.

1 Medvedev Y.

1 Sidorov S.

1 Svistunov V.

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Tunneling Conductivity of Manganites with Negative Magnetoresistance

Magnetic Properties of FeSeTe Compound Crystallized from Liquid Phase