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1

Magnetic and Transport Properties of (Fe_{1-x}Ni_{x})_{2}P in View of KKR-CPA Results

100%

Kaprzyk S., Nizioł S., Toboła J., Zach R., Bacmann M., Fruchart D., Wolfers P.

Acta Physica Polonica A

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1997

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vol. 91

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issue 2

475-478

EN

We present results of the electronic structure study for the solid solution (Fe_{1-x}Ni_{x})_{2}P (space group P6̅2m). The samples were synthesized for x=0.0 up to 0.15. From the electrical conductivity measurements on these materials, it was verified that resistivity increases with increasing temperature up to the Curie point T_{C} and changes the slope at T_{C} decreasing when temperature is raised above T_{C}. To get insight into the possible origin of such observations, we carried out the Korringa-Kohn-Rostoker-coherent potential approximation electronic structure calculations for (Fe_{1-x}Ni_{x})_{2}P in the range of concentration x=0.0 up to 1.0. It was found that alloying with Ni in Fe_{2} P causes vanishing of spin band splitting and non-rigid band behaving of electronic valence states near the Fermi level. The polarization factor for electrons at E_{F} changes in (Fe_{1-x}Ni_{x})_{2}P with increasing x, and interestingly, it reaches maximum at x=0.1, closely to the concentration (x=0.08), when the largest value of T_{C} and a kink in temperature dependent resistivity were detected.

2

Magnetoelastic Properties of MnRhAs_{1-x}p_{x} and Band Structure Results from KKR-CPA

100%

Zach R., Kaprzyk S., Nizioł S., Toboła J., Bacmann M., Fruchart D., Wolfers P.

Acta Physica Polonica A

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1997

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vol. 91

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issue 2

471-474

EN

The magnetoelastic phase transitions were observed in MnRhAs_{1-x}P_{x} system (space group P6̅2m) by X-ray measurements (80 K < T < 300 K). For x = 0.33 and x = 0.4 contents an abrupt change of both lattice parameters and of the elementary cell volume at the metamagnetic transition was detected. The Korringa-Kohn-Rostoker electronic structure calculations performed for MnRhP compound show significant variations of densities of states at the Fermi level, while changing lattice data. The Korringa-Kohn- Rostoker-coherent potential approximation studies of disordered MnRhAs_{1-x}P_{x} system (x=0.6, 0.8, 1.0) were done at the ferromagnetic region. From our calculations we observe moving of bands near E_{F}, while substituting with isoelectronic metalloid, likely as while changing the crystal data in MnRhP.

3

Neutron Diffraction Studies of MnFeAs_{y}P_{1-y} System

100%

Zach R., Bacmann M., Fruchart D., Soubeyroux J., Nizioł S., Fruchart R.

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EN

Magnetic structures of the MnFeAs_{y}P_{1-y} system were examined by means of the neutron diffraction technique in the 1.5-300 K temperature range. Atomic ordering in the metal sublattices, temperature dependence of the incommensurate (y = 0.2 and y = 0.275) and of the ferromagnetic (y = 0.275, y = 0.3, y = 0.5) ordering is discussed.

4

Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System

84%

Średniawa B., Duraj R., Pacyna A., Bombik A., Zach R., Bacmann M., Fruchart D., Nizioł S., Fornal P., Stanek J.

Acta Physica Polonica A

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2000

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vol. 97

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issue 5

921-925

EN

This report focuses on magnetoelastic properties and critical behaviour of (Fe_{1-x}Ni_{x})_{2}P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.

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4 Acta Physica Polonica A

1 2000

2 1997

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4 Bacmann M.

4 Fruchart D.

4 Nizioł S.

4 Zach R.

2 Kaprzyk S.

2 Toboła J.

2 Wolfers P.

1 Bombik A.

1 Duraj R.

1 Fornal P.

1 Fruchart R.

1 Pacyna A.

1 Soubeyroux J.

1 Stanek J.

1 Średniawa B.

Magnetic and Transport Properties of (Fe_{1-x}Ni_{x})_{2}P in View of KKR-CPA Results

Magnetoelastic Properties of MnRhAs_{1-x}p_{x} and Band Structure Results from KKR-CPA

Neutron Diffraction Studies of MnFeAs_{y}P_{1-y} System

Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System