Magnetic Excitation in an Anisotropic Bond-Alternating S=1 One Dimensional Antiferromagnet Ni(C_9D_<24>N_4)(NO_2)ClO_4(Low Dimensional Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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We report the results of inelastic neutron scattering (INS) experiments on the S=1 bond-alternating quasi-one-dimensional (1D) antiferromagnet Ni(C_9D_<24>N_4)(NO_2)ClO_4 under magnetic fields below and above the critical field H_c at which the energy gap closes. Normal field dependence of Zeeman split of the excited triplet state below H_c has been observed, but the highest mode is unusually small and smears out with increasing field. This is probably explained by the highest branch buried in a magnon continuum, which was never observed in the S=1 antiferromagnetic uniform chain. Above H_c, we observed only one excitation branch, which is completely different from the Haldane material NDMAP [A. Zheludev et al., Phys. Rev. B 68 (2003), 134438] where three gapped branches were clearly observed.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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HAGIWARA Masayuki
RIKEN (The Institute of Physical and Chemical Research)
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METOKI Naoto
Japan Atomic Energy Agency
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Zheludev Andrey
Condensed Matter Science Division Oak Ridge National Laboratory
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Regnault Louis
Cea-grenoble Drfmc-spsms
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Regnault Louis
Cea-grenoble Drfmc-spsms-mdn
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Koike Yoshihiro
Jaeri Advanced Science Research Center
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STUNAULT Anne
Institut Laue Langevin
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METOKI Naoto
JAERI, Advanced Science Research Center
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KAKURAI Kazuhisa
JAERI, Advanced Science Research Center
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Kakurai Kazuhisa
Jaeri Advanced Science Research Center
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Hagiwara Masayuki
Riken(the Institute Of Physical And Chemical Research):(present Address)kyokugen Osaka University
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Metoki Naoto
Jaeri Advanced Science Research Center
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Regnault Louis-Pierre
CEA-Grenoble, DRFMC-SPSMS
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HAGIWARA Masayuki
RIKEN(The Institute of Physical and Chemical Research):(Present address)KYOKUGEN, Osaka University
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KOIKE Yoshihiro
JAERI, Advanced Science Research Center
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REGNAULT Louis
CEA-Grenoble, DRFMC-SPSMS-MDN
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ZHELUDEV Andrey
Condensed Matter Sciences Division, Oak Ridge National Laboratory
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