Chigvinadze J., Buntar V., Ashimov S., Machaidze T., Donadze G. Investigation of Magnetic Properties of RB3C60 Single Crystal Fullerene Using Torque Experiments

INVESTIGATION OF MAGNETIC PROPERTIES OF RB3C60 SINGLE CRYSTAL FULLERENE USING TORQUE EXPERIMENTS

Jaba Chigvinadze

Doctor of Physical and Mathematical Sciences,

Head of Superconductivity Laboratory,

Department of Condenced Medium Physics,

Institute of Physics named after E. Andronikashvili

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Tamarashvili St., 6, 0177 Tbilisi, Republic of Georgia

Victor Buntar

Doctor of Physical and Mathematical Sciences,

Department of Physics and Astronomy,

McMaster University

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1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada

Sabir Ashimov

Researcher,

Department of Condenced Meduim Physics,

Institute of Physics named after E. Andronikashvili

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Tamarashvili St., 6, 0177 Tbilisi, Republic of Georgia

Teimuraz Machaidze

Researcher,

Department of Condenced Meduim Physics,

Institute of Physics named after E. Andronikashvili

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Tamarashvili St., 6, 0177 Tbilisi, Republic of Georgia

Giorgi Donadze

Researcher,

Department of Condenced Meduim Physics,

Institute of Physics named after E. Andronikashvili

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Tamarashvili St., 6, 0177 Tbilisi, Republic of Georgia

Abstract. For the first time, magnetic properties of fullerides have been studied using a torque technique. A Rb3C60 single crystal has been investigated in these experiments. It was shown that this method is sensitive to the structural phase transition in both superconducting and normal states. In the superconducting state a transition at Tc = 28 K was observed and a pinning force of the magnetic vortices has been estimated. In the normal state, the transition from s.c. to f.c.c. structure has been indicated. A very strong magnetic response has also been observed at temperatures T ~ 200-250 K, which may be explained in terms of the rearrangement on the magnetic system in the material.

Key words: magnetic state, Rb3C60, fullerene, superconductivity, normal state.

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