TY - JOUR
T1 - Magnetocaloric Effect in Layered Organic Conductor λ-(BETS)2FeCl4
AU - Sugiura, Shiori
AU - Shimada, Kazuo
AU - Tajima, Naoya
AU - Nishio, Yutaka
AU - Terashima, Taichi
AU - Isono, Takayuki
AU - Kato, Reizo
AU - Zhou, Biao
AU - Uji, Shinya
N1 - Funding Information:
We would like to thank H. Shimahara, T. Minamidate, and S. Fukuoka for valuable discussions and K. Utsunomiya for supporting our experiments. This research was partially supported by Grants-in-Aid for Scientific Research on Innovative Areas (Nos. 25287089, 15H02108, 16H06346, 17K05846, and 17H01144).
Funding Information:
Acknowledgements We would like to thank H. Shimahara, T. Minamidate, and S. Fukuoka for valuable discussions and K. Utsunomiya for supporting our experiments. This research was partially supported by Grants-in-Aid for Scientific Research on Innovative Areas (Nos. 25287089, 15H02108, 16H06346, 17K05846, and 17H01144).
Publisher Copyright:
©2018 The Physical Society of Japan.
PY - 2018
Y1 - 2018
N2 - Magnetocaloric effect (MCE) and magnetic torque measurements have been carried out in the π–d system λ-(BETS)2FeCl4 [BETS = bis(ethylenedithio)tetraselenafulvalene], which shows an antiferromagnetic insulating (AFI) phase below ∼8.5 K. In the magnetic torque curve, a sharp structure at ∼1.2 T and a step at ∼10 T are observed at low temperatures, which are caused by the spin-flop (SF) transition and the transition from the AFI to paramagnetic metallic (PM) phase, respectively. The MCE, directly related to the magnetic entropy, shows a small sharp peak at the SF transition and a sharp dip at the AFI–PM transition. The overall feature above 3 K is qualitatively interpreted by a simple picture: antiferromagnetic (AF) π spins and paramagnetic 3d spins at the Fe sites. However, a broad dip in the MCE is additionally found at ∼5 T below ∼3 K, which is not explained by the above picture. The results are compared with those of κ-(BETS)2FeBr4, which shows an AF order of the 3d spins at the Fe sites.
AB - Magnetocaloric effect (MCE) and magnetic torque measurements have been carried out in the π–d system λ-(BETS)2FeCl4 [BETS = bis(ethylenedithio)tetraselenafulvalene], which shows an antiferromagnetic insulating (AFI) phase below ∼8.5 K. In the magnetic torque curve, a sharp structure at ∼1.2 T and a step at ∼10 T are observed at low temperatures, which are caused by the spin-flop (SF) transition and the transition from the AFI to paramagnetic metallic (PM) phase, respectively. The MCE, directly related to the magnetic entropy, shows a small sharp peak at the SF transition and a sharp dip at the AFI–PM transition. The overall feature above 3 K is qualitatively interpreted by a simple picture: antiferromagnetic (AF) π spins and paramagnetic 3d spins at the Fe sites. However, a broad dip in the MCE is additionally found at ∼5 T below ∼3 K, which is not explained by the above picture. The results are compared with those of κ-(BETS)2FeBr4, which shows an AF order of the 3d spins at the Fe sites.
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U2 - 10.7566/JPSJ.87.044601
DO - 10.7566/JPSJ.87.044601
M3 - Article
AN - SCOPUS:85045034713
SN - 0031-9015
VL - 87
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 4
M1 - 044601
ER -