Mysterious paramagnetic states of Fe 3d spin in antiferromagnetic insulator of λ-BETS2FeCl4 system

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  • Mysterious Paramagnetic States of Fe 3d Spin in Antiferromagnetic Insulator of λ-BETS<SUB>2</SUB>FeCl<SUB>4</SUB> System
  • Mysterious paramagnetic states of Fe 3d spin in antiferromagnetic insulator of l BETS2FeCl4 system
  • Mysterious paramagnetic states of Fe 3d spin in antiferromagnetic insulator of κ-BETS2FeCl4system

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In this study, we have investigated a quasi-two-dimensional organic conductor, λ-BETS2FeCl4, that exhibits a phase transition from a paramagnetic metal to an antiferromagnetic (AF) insulator at a critical temperature (TMI∼8.3 K). To investigate the mechanism of a notable phase transition, we studied the thermal properties of the conductor for temperatures down to 0.2 K at zero magnetic field. We observed that the specific heat of the conductor showed a sharp peak at TMI and a Schottky-type hump. The temperature dependence of the excess specific heat clarifies that π and 3d spins do not cooperatively form an AF order at TMI. We concluded that a 3d spin system keeps a paramagnetic state even at the lowest studied temperature.

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