Magnetic and Thermal Properties of $\lambda$-(BETS)2FeCl4 System ---Fe 3d Spin in Antiferromagnetic Insulating Phase

A quasi-two-dimensional organic conductor $\lambda$-(BETS) 2 FeCl 4 [BETS = bis(ethylenedithio)tetraselenafulvalene] exhibits a new type of phase transition from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI) at a transition temperature ($T_{\text{MI}}$) of 8.3 K under zero magnet...

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Published in:Journal of the Physical Society of Japan 2011-06, Vol.80 (6), p.063601-063601-3
Main Authors: Akiba, Hiroshi, Nobori, Kento, Shimada, Kazuo, Nishio, Yutaka, Kajita, Koji, Zhou, Biao, Kobayashi, Akiko, Kobayashi, Hayao
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container_issue 6
container_start_page 063601
container_title Journal of the Physical Society of Japan
container_volume 80
creator Akiba, Hiroshi
Nobori, Kento
Shimada, Kazuo
Nishio, Yutaka
Kajita, Koji
Zhou, Biao
Kobayashi, Akiko
Kobayashi, Hayao
description A quasi-two-dimensional organic conductor $\lambda$-(BETS) 2 FeCl 4 [BETS = bis(ethylenedithio)tetraselenafulvalene] exhibits a new type of phase transition from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI) at a transition temperature ($T_{\text{MI}}$) of 8.3 K under zero magnetic field. We studied its thermodynamic properties and found a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility below $T_{\text{MI}}$. These anomalies are explained by a new model in which the 3 d spin maintains the paramagnetic states against the antiferromagnetic ordering of the $\pi$ spin.
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We studied its thermodynamic properties and found a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility below $T_{\text{MI}}$. 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We studied its thermodynamic properties and found a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility below $T_{\text{MI}}$. 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The inset shows the energy levels of Fe spin $S_{\text{d}} = 5/2$ caused by Zeeman splitting. The solid curve shows six-level Schottky specific heat. Magnetic susceptibility $M/H$ of $\lambda$-(BETS) 2 FeCl 4 under external magnetic field parallel to the $c$-axis. The solid and dashed curves show the magnetic susceptibility calculated on the basis of the paramagnetic 3 d spin model and Curie--Weiss law, respectively. (Color) (a) Schematic view of the $\pi$ and 3 d spin structures in the AFI phase. The open and closed arrows represent $\pi$ spin $S_{\pi} = 1/2$ localized at the BETS dimer and Fe 3 d spin $S_{\text{d}} = 5/2$, respectively. After the AF ordering of $\pi$ spin, the internal fields $+\mbi{H}_{\pi\text{d}}$ and $-\mbi{H}_{\pi\text{d}}$ are expected at the Fe sites. (b) Effective magnetic field $\mbi{H}_{\text{eff}}^{+}$ ($\mbi{H}_{\text{eff}}^{-}$) at the Fe A (B) site with external field $\mbi{H}$ parallel to the $c$-axis and internal field $+\mbi{H}_{\pi\text{d}}$ ($-\mbi{H}_{\pi\text{d}}$). The AF easy axis is confined to the $b^{*}c$ plane and makes an angle $\theta$ with respect to the $c$-axis.</notes><abstract>A quasi-two-dimensional organic conductor $\lambda$-(BETS) 2 FeCl 4 [BETS = bis(ethylenedithio)tetraselenafulvalene] exhibits a new type of phase transition from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI) at a transition temperature ($T_{\text{MI}}$) of 8.3 K under zero magnetic field. We studied its thermodynamic properties and found a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility below $T_{\text{MI}}$. These anomalies are explained by a new model in which the 3 d spin maintains the paramagnetic states against the antiferromagnetic ordering of the $\pi$ spin.</abstract><pub>The Physical Society of Japan</pub><doi>10.1143/JPSJ.80.063601</doi></addata></record>
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title Magnetic and Thermal Properties of $\lambda$-(BETS)2FeCl4 System ---Fe 3d Spin in Antiferromagnetic Insulating Phase
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