Magnetic Phase Transitions in Pure and Cobalt-Doped Geometrically Frustrated Ni_3V_2O_8 Single Crystals

• Authors: H. Szymczak , M. Baran , R. Szymczak , S. Barilo , G. Bychkov , S. Shiryaev
• Languages of publication: EN

Abstracts

EN

The results of magnetic measurements performed on geometrically frustrated Ni_3V_2O_8 and Ni_{3(1-x)}Co_{3x}V_2O_8 single crystals with x=0.03 are presented. It was found that Co doping did not change considerably the magnetic H-T phase diagram. Although no spin-glass effects were observed, nevertheless, a strong effect of 3 at% cobalt doping was evidenced. The main effect of Co-doping concerns the direction of the antiferromagnetic vector, which for Ni_3V_2O_8 appears along the $a$ axis, while for only slightly Co doped crystals - along the $c$ axis. This switching of direction results from distinct changes of the magnetocrystalline anisotropy due to the presence of Co^{2+} ions strongly coupled to the kagome lattice. The disorder introduced by doping has practically no effect on the magnitude of the isotropic exchange interactions. At the same time the doping suppresses the Dzyaloshinskii-Moriya exchange interactions due to the change of direction of the antiferromagnetic vector.

Keywords

EN

75.30.Gw; 75.30.Kz; 75.40.Cx; 75.50.-y

Discipline

• 75.50.-y: Studies of specific magnetic materials
• 75.30.Gw: Magnetic anisotropy
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 111
• Issue: 1
• Pages: 71-77

Dates

published

2007-01

received

2006-09-04

Contributors

author

H. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

M. Baran

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

R. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

S. Barilo

• Institute of Solid State and Semiconductor Physics, P. Brovki 17, 220072 Minsk, Belarus

author

G. Bychkov

• Institute of Solid State and Semiconductor Physics, P. Brovki 17, 220072 Minsk, Belarus

author

S. Shiryaev

• Institute of Solid State and Semiconductor Physics, P. Brovki 17, 220072 Minsk, Belarus

References

• 1. R. Szymczak, M. Baran, R. Diduszko, J. Fink-Finowicki, M. Gutowska, A. Szewczyk, H. Szymczak, Phys. Rev. B, 73, 094425, 2006
• 2. G. Laves, M. Kenzelmann, N. Rogado, K.H. Kim, G.A. Jorge, R.J. Cava, A. Aharony, O. Entin-Wohlman, A.B. Harris, T. Yildirim, Q.Z. Huang, S. Park, C. Broholm, A.P. Ramirez, Phys. Rev. Lett., 93, 247201, 2004
• 3. M. Kenzelmann, A.B. Harris, A. Aharony, O. Entin-Wohlman, T. Yildirim, Q.Z. Huang, S. Park, G. Laves, C. Broholm, N. Rogado, R.J. Cava, K.H. Kim, G.A. Jorge, A.P. Ramirez, Phys. Rev. B, 74, 14429, 2006
• 4. S. Dommange, M. Mambrini, B. Normand, F. Mila, Phys. Rev. B, 68, 224416, 2003
• 5. K.H. Hoglund, A.S. Sandvik, Phys. Rev. B, 70, 024406, 2004
• 6. A.V. Syromyatnikov, S.V. Maleyev, Phys. Rev. B, 72, 174419, 2005
• 7. D. Poilblanc, A. Lauchli, M. Mambrini, F. Mila, Phys. Rev. B, 73, 100403, 2006

Identifiers

DOI

10.12693/APhysPolA.111.71