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Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

100%

Čizmár E., Černák J., Orendáč M., Herrmannsdörfer T., Feher A.

Acta Physica Polonica A

2000

vol. 97

issue 3

579-582

In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k_{B}=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k_{B}=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.

Low Temperature Transport and Magnetic Properties of SmB_{6}

86%

Gabani S., Flachbart K., Pavlík V., Konovalova E., Paderno Y., Herrmannsdörfer T.

Acta Physica Polonica A

2000

vol. 97

issue 3

419-422

We present results of transport and magnetic properties of three single-crystalline samples of the intermediate valence small-gap semiconductor SmB_{6} at low temperatures. The received resistivity dependences of the samples below 0.5 K exhibit an activated behavior with an energy gap of a few mK. The temperature dependences of the magnetic susceptibility show an increase below 15 K which can be accounted for by impurities, by bare Sm^{3+} ions or by a small amount of in-gap magnetic 4f^{5}5d^{1} states.

Ce_{3}Cu_{3}Sb^{4}: a Canted Antiferromagnetic Semimetal

86%

Wachter P., Degiorgi L., Wetzel G., Schwer H., Mattenberger K., Herrmannsdörfer T., Fischer P.

Acta Physica Polonica A

2000

vol. 97

issue 1

43-58

It has been claimed by Patil et al., that Ce_{3}Cu_{3}Sb_{4} is the first Ce-based semiconducting ferromagnet. In this paper it is shown, mainly with Hall effect and far infrared spectroscopy that no gap in the excitation spectrum exists, as well above as below the magnetic ordering temperature. A maximum in the resistivity near T_{C} is due to trapped magnetic polarons. The resistivity is an effect of the mobility of the charge carriers. The structure of the magnetic unit cell has been determined with elastic neutron scattering.

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3 Acta Physica Polonica A

3 2000

3 Herrmannsdörfer T.

1 Degiorgi L.

1 Feher A.

1 Fischer P.

1 Flachbart K.

1 Gabani S.

1 Konovalova E.

1 Mattenberger K.

1 Orendáč M.

1 Paderno Y.

1 Pavlík V.

1 Schwer H.

1 Wachter P.

1 Wetzel G.

1 Černák J.

1 Čizmár E.

Search results

Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C_{11}H_{10}N_{2}O)_{2}Ni(CN)_{4}

Low Temperature Transport and Magnetic Properties of SmB_{6}

Ce_{3}Cu_{3}Sb^{4}: a Canted Antiferromagnetic Semimetal