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Disorder-to-order transition in the magnetic and electronic properties of URh_2Ge_2

Autor: Suellow, S., Mentink, S. A. M., Mason, T. E., Feyerherm, R., Nieuwenhuys, G. J., Menovsky, A. A., Mydosh, J. A.

We present a study of annealing effects on the physical properties of tetragonal single--crystalline URh_2Ge_2. This system, which in as-grown form was recently established as the first metallic 3D random-bond heavy-fermion spin glass, is transformed

Externí odkaz: http://arxiv.org/abs/cond-mat/9912403

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Second Low Temperature Phase Transition in Frustrated UNi_4B

Autor: Movshovich, R., Jaime, M., Mentink, S., Menovsky, A. A., Mydosh, J. A.

Hexagonal UNi_4B is magnetically frustrated, yet it orders antiferromagnetically at T_N = 20 K. However, one third of the U-spins remain paramagnetic below this temperature. In order to track these spins to lower temperature, we measured the specific

Externí odkaz: http://arxiv.org/abs/cond-mat/9901247

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Spin glass behavior in URh_2Ge_2

Autor: Sullow, S., Nieuwenhuys, G. J., Menovsky, A. A., Mydosh, J. A., Mentink, S. A. M., Mason, T. E., Buyers, W. J. L

URh_2Ge_2 occupies an extraordinary position among the heavy-electron 122-compounds, by exhibiting a previously unidentified form of magnetic correlations at low temperatures, instead of the usual antiferromagnetism. Here we present new results of ac

Externí odkaz: http://arxiv.org/abs/cond-mat/9611169

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Magnetic phase diagram and transport properties of FeGe_2

Autor: Adams, C. P., Mason, T. E., Mentink, S. A. M., Fawcett, E.

Publikováno v: J. Phys.: Condens. Matter 9 (1997) 1347-1355.

We have used resistivity measurements to study the magnetic phase diagram of the itinerant antiferromagnet FeGe_2 in the temperature range from 0.3->300 K in magnetic fields up to 16 T. In contrast to theoretical predictions, the incommensurate spin

Externí odkaz: http://arxiv.org/abs/cond-mat/9611144

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Itinerant Antiferromagnetism in FeGe_2

Autor: Mason, T. E., Adams, C. P., Mentink, S. A. M., Fawcett, E., Menshikov, A. Z., Frost, C. D., Forsyth, J. B., Perring, T. G., Holden, T. M.

FeGe_2, and lightly doped compounds based on it, have a Fermi surface driven instability which drive them into an incommensurate spin density wave state. Studies of the temperature and magnetic field dependence of the resistivity have been used to de

Externí odkaz: http://arxiv.org/abs/cond-mat/9610009

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Magnetic correlations in deuteronium jarosite, a model S=5/2 Kagome antiferromagnet

Autor: Wills, A. S., Harrison, A, Mentink, S. A. M., Mason, T. E., Tun, Z.

Deuteronium jarosite, (D_3O)Fe_3(SO_4)_2(OD)_6, contains a kagome lattice of Heisenberg spins, S=5/2, with a coverage of 97+-1%. DC and AC susceptibility measurements show strong in-plane antiferromagnetic exchange (\theta_CW=-1500+-300K) and a spin-

Externí odkaz: http://arxiv.org/abs/cond-mat/9607106

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