Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-07-12
Phys. Rev. B 65, 144421 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 pages, 9 figures, submitted to Phys. Rev. B, Contact: kadowaki@phys.metro-u.ac.jp
Scientific paper
10.1103/PhysRevB.65.144421
By means of neutron scattering techniques we have investigated the frustrated pyrochlore magnet Ho_2Sn_2O_7, which was found to show a ferromagnetic spin-ice behavior below T \simeq 1.4 K by susceptibility measurements. High-resolution powder-neutron-diffraction shows no detectable disorder of the lattice, which implies appearance of a random magnetic state solely by frustrated geometry, i.e., the corner sharing tetrahedra. Magnetic inelastic-scattering spectra show that Ho magnetic moments behave as an Ising spin system at low temperatures, and that the spin fluctuation has static character. The system remains in a short-range ordered state down to T = 0.4 K. By analyzing the wave-number dependence of the magnetic scattering using a mean field theory, it is clarified that the Ising spins interact via the dipolar interaction. Therefore we conclude that Ho_2Sn_2O_7 belongs to the dipolar-spin-ice family. Slow spin dynamics is exhibited as thermal hysteresis and time dependence of the magnetic scattering.
Hinatsu Yukio
Ishii Yoshinobu
Kadowaki Hiroaki
Matsuhira Kazuyuki
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