TY - JOUR
T1 - 13C NMR study of the spin-liquid state in the triangular quantum antiferromagnet EtMe3Sb[Pd(dmit)2]2
AU - Itou, T.
AU - Oyamada, A.
AU - Maegawa, S.
AU - Tamura, M.
AU - Kato, R.
PY - 2009
Y1 - 2009
N2 - The family of layered organic salts X[Pd(dmit)2]2 are Mott insulators and form scalenetriangular spin-1/2 systems with antiferromagnetic exchange interactions J. Among them, EtMe3Sb[Pd(dmit)2]2 has a nearly regular-triangular spin system with J = 220-250 K. Our previous study proposed that a quantum spin-liquid state is realized in this system because this system was revealed to have neither spin ordering/freezing nor an appreciable spin gap down to 1.37 K. In the present study, to confirm the absence of spin ordering/freezing in the low-temperature limit, we cooled this system down to 19.4 mK, which is 4 orders of magnitude smaller than J, and measured 13C-NMR spectra. The obtained spectra do not show any critical broadening. Therefore, it is concluded that the spin system of EtMe 3Sb[Pd(dmit)2]2 does not have spin ordering/freezing in the low-temperature limit; that is, the spin system is in a quantum-fluctuating spin state.
AB - The family of layered organic salts X[Pd(dmit)2]2 are Mott insulators and form scalenetriangular spin-1/2 systems with antiferromagnetic exchange interactions J. Among them, EtMe3Sb[Pd(dmit)2]2 has a nearly regular-triangular spin system with J = 220-250 K. Our previous study proposed that a quantum spin-liquid state is realized in this system because this system was revealed to have neither spin ordering/freezing nor an appreciable spin gap down to 1.37 K. In the present study, to confirm the absence of spin ordering/freezing in the low-temperature limit, we cooled this system down to 19.4 mK, which is 4 orders of magnitude smaller than J, and measured 13C-NMR spectra. The obtained spectra do not show any critical broadening. Therefore, it is concluded that the spin system of EtMe 3Sb[Pd(dmit)2]2 does not have spin ordering/freezing in the low-temperature limit; that is, the spin system is in a quantum-fluctuating spin state.
UR - http://www.scopus.com/inward/record.url?scp=66749147137&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/145/1/012039
DO - 10.1088/1742-6596/145/1/012039
M3 - Conference article
AN - SCOPUS:66749147137
SN - 1742-6588
VL - 145
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012039
T2 - 4th International Conference on Highly Frustrated Magnetism 2008, HFM 2008
Y2 - 7 September 2008 through 12 September 2008
ER -