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-AgCuPO
Hase, Masashi*; Matsuda, Masaaki; Kakurai, Kazuhisa; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naohito*; D
nni, A.*; Kuroe, Haruhiko*
Physical Review B, 76(13), p.134403_1 - 34403_5, 2007/10
Times Cited Count：2 Percentile：12.52(Materials Science, Multidisciplinary)The magnetism of -AgCuPO has been studied using inelastic neutron scattering and magnetic susceptibility measurements on powder sample. A well-defined symmetric broad inelastic peak was observed at 6.2meV energy transfer, indicating the existence of spin-gap excitation. From the Q-dependence of the inelastic magnetic intensities it is concluded that the strongest exchange interaction exists in the Cu-O-P-O-Cu path and that the antiferromagnetic alternating chain model with two exchange interactions values of 80 and 14K can quantitatively explain the experimental results.
Nishiwaki, Yoichi*; Osawa, Akira*; Kakurai, Kazuhisa; Nakamura, Tota*; Todoroki, Norikazu*; Kuroe, Haruhiko*; Kato, Tetsuya*
no journal, ,
no abstracts in English
Kakurai, Kazuhisa; Matsuda, Masaaki; Hase, Masashi*; Ozawa, Kiyoshi*; Kitazawa, Hideaki*; Tsujii, Naoto*; Doenni, A.*; Hu, X.*; Kuroe, Haruhiko*
no journal, ,
We report powder sample inelastic neutron scattering experiments on spin gap systems. Recently the magnetization plateau phenomenon in quantum spin systems are drawing attention of both theoretical and experimental physicists. Although the relevant exchange energies can be estimated from the magnetic susceptibility measurements assuming some theoretical models, we can only speculate the exchange interaction scheme causing the singlet ground state based on the structural and bonding information. We shall present examples of powder sample inelastic neutron scattering studies on the antiferromagnetic alternating chain system -AgCuPO and trimer chain compound Cu(P
O
OD) using triple axis spectrometer at the steady state neutron source and stress that this kind of research on novel quantum systems could be very effectively performed using the low-energy chopper type spectrometer being built for the J-PARC spallation neutron source.
MoO
Kuroe, Haruhiko*; Hamasaki, Tomoyuki*; Hase, Masashi*; Kaneko, Koji; Metoki, Naoto; Matsuda, Masaaki; Kakurai, Kazuhisa; Oka, Kunihiko*; Ito, Toshimitsu*; Eisaki, Hiroshi*
no journal, ,
We have measured inelastic neutron scattering in CuMoO to study its magnetic-excitation dispersion curves. This material can be treated as a complex of the following two spin subsystems. (1) Quasi-one-dimensional antiferromagnetic (AF) spin chain with the intrachain interaction pJ4 = 6.3 meV, where p is the renormalization factor depending on the system dimension, together with the ferromagnetic and AF interchain interactions -Ja = J 0.01pJ4. (2) AF spin dimers with the interaction J3 = 5.8 meV. The hybridization parameter, representing the intersubsystem interaction between these subsystems, is estimated as Eint sin (k), where Eint = 1.6 meV. The modulation of the molecular field generated by the spin precession in the excited state of the quasi-one-dimensional spin chain plays an important role in this hybridization.
