Antiferromagnetic order driven by the molecular orbital order of C$_{60}$ in $α'$--tetra--$kis$--(dimethylamino)--ethylene--C$_{60}$

Details Antiferromagnetic order driven by the molecular orbital order of C$_{60}$ in $α'$--tetra--$kis$--(dimethylamino)--ethylene--C$_{60}$ Antiferromagnetic order driven by the molecular orbital order of C$_{60}$ in $α'$--tetra--$kis$--(dimethylamino)--ethylene--C$_{60}$

2007-10-02

arxiv.org/abs/0710.0535v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.177205

We have studied the ground state of a fullerene--based magnet, the $\alpha'$--phase tetra--$kis$--(dimethylamino)--ethylene--C$_{60}$ ($\alpha'$--TDAE--C$_{60}$), by electron spin resonance (ESR) and magnetic torque measurements. Below T$_N=7$ K, non--paramagnetic field dependent resonances with a finite excitation gap (1.7 GHz) are observed along the $a$--axis. Strong enhancement in their intensity as temperature is decreased is inconsistent with excitation from a singlet state, which had been proposed for the $\alpha'$--phase ground state. Below T$_N$, non--quadratic field dependence of magnetic torque signal is also observed in contrast to quadratic field dependence in the paramagnetic phase. The angle--dependent torque signals below T$_N$ indicate the existence of an anisotropy of the bulk magnetization. From both experiments, we propose an antiferromagnetic ground state driven by the cooperative orientational ordering of C$_{60}$ in the $\alpha'$--TDAE--C$_{60}$.

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