期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 82, 期 7, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.82.073707
关键词
Dy2Ti2O7; magnetic monopole; spin ice; ac susceptibility
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Grants-in-Aid for Scientific Research [24740239] Funding Source: KAKEN
The spin dynamics of the dipolar spin-ice Dy2Ti2O7 under a dc magnetic field (B-dc) along the [111] direction has been investigated using ac susceptibility (chi(ac)), which enables us to study two-dimensional monopole motion in an ac magnetic field perpendicular to Bdc. We have observed the slowing down of monopole dynamics in the kagome spin-ice regime (B-dc similar to 0.4 T) and the extreme speeding up under B-dc close to the critical point (B-dc similar to 0.93 T). An analysis using a Monte Carlo simulation suggests that the dynamics changes from a random walk of monopoles to a collective motion as B-dc increases.
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