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Title: Weak ferromagnetism and glassy state in κ - ( BEDT - TTF ) 2 Hg ( SCN ) 2 Br

Abstract

SInce the first observation of weak ferromagnetism in the charge-transfer salt kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl [U. Welp et al., Phys. Rev. Lett. 69, 840 (1992)], no further evidence of a ferromagnetic state in this class of organic materials has been reported. Here, static and dynamic spin susceptibility measurements on kappa-(BEDT-TTF)(2)Hg(SCN)(2)Br exhibit weak ferromagnetism below 20 K on the geometrically frustrated background. Our experimental results suggest that frustrated spins in the molecular dimers suppress long-range antiferromagnetic order, forming a spin-glass-type ground state of the triangular lattice in the insulating phase which locally contains ferromagnetic polarons. Moreover, specific-heat data reveal an excess peak located around 5 K, indicating the glassy nature of the electrons as well.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
German Research Foundation (DFG); National Science Foundation (NSF)
OSTI Identifier:
1501879
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Hemmida, M., von Nidda, H. -A. Krug, Miksch, B., Samoilenko, L. L., Pustogow, A., Widmann, S., Henderson, A., Siegrist, T., Schlueter, J. A., Loidl, A., and Dressel, M. Weak ferromagnetism and glassy state in κ-(BEDT-TTF)2Hg(SCN)2Br. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.241202.
Hemmida, M., von Nidda, H. -A. Krug, Miksch, B., Samoilenko, L. L., Pustogow, A., Widmann, S., Henderson, A., Siegrist, T., Schlueter, J. A., Loidl, A., & Dressel, M. Weak ferromagnetism and glassy state in κ-(BEDT-TTF)2Hg(SCN)2Br. United States. doi:10.1103/PhysRevB.98.241202.
Hemmida, M., von Nidda, H. -A. Krug, Miksch, B., Samoilenko, L. L., Pustogow, A., Widmann, S., Henderson, A., Siegrist, T., Schlueter, J. A., Loidl, A., and Dressel, M. Sat . "Weak ferromagnetism and glassy state in κ-(BEDT-TTF)2Hg(SCN)2Br". United States. doi:10.1103/PhysRevB.98.241202.
@article{osti_1501879,
title = {Weak ferromagnetism and glassy state in κ-(BEDT-TTF)2Hg(SCN)2Br},
author = {Hemmida, M. and von Nidda, H. -A. Krug and Miksch, B. and Samoilenko, L. L. and Pustogow, A. and Widmann, S. and Henderson, A. and Siegrist, T. and Schlueter, J. A. and Loidl, A. and Dressel, M.},
abstractNote = {SInce the first observation of weak ferromagnetism in the charge-transfer salt kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl [U. Welp et al., Phys. Rev. Lett. 69, 840 (1992)], no further evidence of a ferromagnetic state in this class of organic materials has been reported. Here, static and dynamic spin susceptibility measurements on kappa-(BEDT-TTF)(2)Hg(SCN)(2)Br exhibit weak ferromagnetism below 20 K on the geometrically frustrated background. Our experimental results suggest that frustrated spins in the molecular dimers suppress long-range antiferromagnetic order, forming a spin-glass-type ground state of the triangular lattice in the insulating phase which locally contains ferromagnetic polarons. Moreover, specific-heat data reveal an excess peak located around 5 K, indicating the glassy nature of the electrons as well.},
doi = {10.1103/PhysRevB.98.241202},
journal = {Physical Review B},
issn = {2469-9950},
number = 24,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}