TY - JOUR
T1 - Spin excitations in the field-induced phase of the quasi-one-dimensional S = 1 heisenberg antiferromagnet NDMAP
AU - Kashiwagi, Takanari
AU - Hagiwara, Masayuki
AU - Kimura, Shojiro
AU - Miyazaki, Hiroshi
AU - Harada, Isao
AU - Honda, Zentaro
AU - Kindo, Koich
N1 - Funding Information:
Acknowledgments This work was supported by Grants-in-Aid for Scientific Research (B) (No. 20340089) and for Scientific Research on Priority Areas ‘‘High Field Spin Science in 100T’’ (No. 451) from the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2009
Y1 - 2009
N2 - The S = 1 quasi-one-dimensional Heisenberg antiferromagnet [Ni(C5H14N2)2N3](PF6), abbreviated as NDMAP, has been studied by electron spin resonance in a magnetic field above the critical field (Hc). We studied angular and frequency dependences of spin excitations. The angular dependence of the spin excitations in the vicinity of Hc is explained well by a phenomenological field theory, but the agreement between the experiment and the calculation is not satisfactory above 10 T. In high magnetic fields above 15 T, we obtained some characteristic spin excitations which are well explained by conventional antiferromagnetic resonance modes. These results suggest that the spin excitations change from a quantum state to a classical one due to the suppression of quantum fluctuations by high magnetic fields.
AB - The S = 1 quasi-one-dimensional Heisenberg antiferromagnet [Ni(C5H14N2)2N3](PF6), abbreviated as NDMAP, has been studied by electron spin resonance in a magnetic field above the critical field (Hc). We studied angular and frequency dependences of spin excitations. The angular dependence of the spin excitations in the vicinity of Hc is explained well by a phenomenological field theory, but the agreement between the experiment and the calculation is not satisfactory above 10 T. In high magnetic fields above 15 T, we obtained some characteristic spin excitations which are well explained by conventional antiferromagnetic resonance modes. These results suggest that the spin excitations change from a quantum state to a classical one due to the suppression of quantum fluctuations by high magnetic fields.
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U2 - 10.1007/s00723-009-0027-1
DO - 10.1007/s00723-009-0027-1
M3 - Article
AN - SCOPUS:79960889754
SN - 0937-9347
VL - 36
SP - 309
EP - 316
JO - Applied Magnetic Resonance
JF - Applied Magnetic Resonance
IS - 2-4
ER -