TY - JOUR
T1 - Antiferromagnetic resonance in methylaminated potassium fulleride (C H3 N H2) K3 C60
AU - Arčon, Denis
AU - Pregelj, Matej
AU - Zorko, Andrej
AU - Ganin, Alexey Yu
AU - Rosseinsky, Matthew J.
AU - Takabayashi, Yasuhiro
AU - Prassides, Kosmas
AU - Van Tol, Hans
AU - Brunel, L. C.
PY - 2008/1/3
Y1 - 2008/1/3
N2 - High-frequency magnetic resonance measurements (νL =9.6-420 GHz) were employed to investigate the low-temperature antiferromagnetic ground state of the (C H3 N H2) K3 C60 fulleride. The frequency and temperature dependence of the intensity, linewidth, and center of the resonance signal detected below TN are characteristic of antiferromagnetic resonance (AFMR). The AFMR intensity is consistent with an ordered magnetic moment of μeff =0.7 (1) μB C60, while the narrowing of the AFMR signal with increasing resonance frequency can be modeled with a spin-flop field of Hsf =840 (80) G and a g -factor anisotropy of δγ=710 (50) ppm. We stress that the spin-flop field is reduced compared to the ammoniated analog (N H3) K3 C60 on the account of reduced C60 3- - C60 3- exchange interactions. Differences in the level of the anisotropic expansion between C H3 N H2 and N H3 cointercalated fullerides are likely to be responsible for the differences in the electronic structure between the two systems and ultimately may account for the reduced Néel temperature in (C H3 N H2) K3 C60.
AB - High-frequency magnetic resonance measurements (νL =9.6-420 GHz) were employed to investigate the low-temperature antiferromagnetic ground state of the (C H3 N H2) K3 C60 fulleride. The frequency and temperature dependence of the intensity, linewidth, and center of the resonance signal detected below TN are characteristic of antiferromagnetic resonance (AFMR). The AFMR intensity is consistent with an ordered magnetic moment of μeff =0.7 (1) μB C60, while the narrowing of the AFMR signal with increasing resonance frequency can be modeled with a spin-flop field of Hsf =840 (80) G and a g -factor anisotropy of δγ=710 (50) ppm. We stress that the spin-flop field is reduced compared to the ammoniated analog (N H3) K3 C60 on the account of reduced C60 3- - C60 3- exchange interactions. Differences in the level of the anisotropic expansion between C H3 N H2 and N H3 cointercalated fullerides are likely to be responsible for the differences in the electronic structure between the two systems and ultimately may account for the reduced Néel temperature in (C H3 N H2) K3 C60.
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U2 - 10.1103/PhysRevB.77.035104
DO - 10.1103/PhysRevB.77.035104
M3 - Article
AN - SCOPUS:37749017640
SN - 0163-1829
VL - 77
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 3
M1 - 035104
ER -