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Magnetic phase transition in pure and cobalt-doped geometrically frustrated Ni3V2O8 single crystals

Henryk Szymczak 1Marek Baran 1Ritta Szymczak 1Sergej N. Barilo 2Georgij Bychkov 2Sergei V. Shiryaev 2

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. The Institute of Solid State & Semiconductor Physics, Belarus NAS (ISSSP), P. Brovka, Minsk 220072, Belarus


The recent interest in geometrically frustrated systems is spurred by the new phenomena predicted such as: noncollinear Neel long-range order, "order by disorder", magnetization plateaus and magnetization jumps. Of particular interest is magnetism on the two-dimensional kagome lattice which consists of corner-sharing triangles. Recently, magnetic phase transitions in isostructural kagome-type compounds Ni3V2O8 [1] and Co3V2O8 [2] have been studied in details. Since, traditionally, it is assumed that both randomness and frustration lead to spin-glass effects we decided to introduce chemical disorder by Co- doping Ni3V2O8 single crystals. In this paper we describe the results of magnetic measurements performed on Ni3V2O8 and Ni2.91Co0.09V2O8 single crystals. Although no spin-glass effects have been observed nevertheless a strong effect of 3 at% cobalt doping has been evidenced. In particular, Co-doping leads to new, magnetic field induced, phase transitions for H║a and H║c. It means that a strong ion-lattice coupling expected for Co2+ in octahedral sites is responsible for the change of magnetocrystalline anisotropy in Ni3V2O8, but also for the local deformations related to a Jahn-Teller effects, which influences the exchange interactions in the system.

[1] G.Laves et al., Phys. Rev. Lett. 93 (2004) 247201.

[2] R.Szymczak et al., Phys. Rev. B 73 (2006) 094425.

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium K, by Henryk Szymczak
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 13:29
Revised:   2009-06-07 00:44