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The Magnetic and Electric Measurements of the Multiferroic PbFe1/2Nb1/2O3 Ceramics Obtained Using Hot Uniaxial Pressure Method

100%

Bochenek D., Skulski R., Niemiec P., Brzezińska D., Rogacki K.

Archives of Metallurgy and Materials

2018

vol. 63

issue 3

Superconductivity and Ferromagnetism in La_{0.67}Sr_{0.33}MnO₃/YBa₂Cu₃O₇ Nanosized Heterostructures

100%

Lochmajer H., Matusiak M., Urbanik G., Przyslupski P., Rogacki K.

Acta Physica Polonica A

2016

vol. 130

issue 2

588-592

In this work we present recent experimental studies of heterostructures composed of ferromagnetic La_{0.67}Sr_{0.33}MnO₃ (LSMO) and superconducting YBa₂Cu₃O₇ (YBCO) multilayers grown by dc sputtering method. The transport and magnetic properties of the large set of heterostructures were investigated in a wide temperature range from 2 to 400 K and in fields up to 12.5 T. The resistivity and the upper critical field were measured for samples with the plane active dimensions 1.5× 5 mm². The Nernst effect was studied in the mixed state revealing the characteristic temperature dependence of the Nernst signal which was correlated with variation of the upper critical field. We have observed an influence of the magnetic LSMO layer on the superconducting properties of the adjacent YBCO layer which consists in a substantial reduction of the superconducting critical temperature and a small lowering of the upper critical field.

Thermoelectric Power of MgB_2 Single Crystals Doped with Holes and Electrons

86%

Oganisian K., Rogacki K., Sulkowski C., Zhigadlo N., Katrych S., Karpinski J.

Acta Physica Polonica A

2008

vol. 114

issue 1

191-195

The thermoelectric power of MgB_2 single crystals, non-substituted, single-substituted with C, and co-substituted with C and Li, was investigated in the temperature range from 10 to 300 K. Both the in-plane (S_ab) and the out-of-plane (S_c) thermoelectric powers are positive for non-substituted crystals and both S_ab and S_c change a sign for crystals doped with electrons when C is substituted for B in the amount larger than 6 at.%. The substitution of C, which supplies electrons mainly into the σ band, reduces the thermoelectric power anisotropy, most likely by increasing the interband scattering. When Li is additionally co-substituted for Mg, S_ab remains unchanged but S_c increases substantially. The Li substitution donates holes into the π band rather than into the σ band and in this way modifies the π band properties, including the possible increase in the intraband scattering.

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2 Acta Physica Polonica A

1 Archives of Metallurgy and Materials

1 2018

1 2016

1 2008

3 Rogacki K.

1 Bochenek D.

1 Brzezińska D.

1 Karpinski J.

1 Katrych S.

1 Lochmajer H.

1 Matusiak M.

1 Niemiec P.

1 Oganisian K.

1 Przyslupski P.

1 Skulski R.

1 Sulkowski C.

1 Urbanik G.

1 Zhigadlo N.

Search results

The Magnetic and Electric Measurements of the Multiferroic PbFe1/2Nb1/2O3 Ceramics Obtained Using Hot Uniaxial Pressure Method

Superconductivity and Ferromagnetism in La_{0.67}Sr_{0.33}MnO₃/YBa₂Cu₃O₇ Nanosized Heterostructures

Thermoelectric Power of MgB_2 Single Crystals Doped with Holes and Electrons