Magnetricity and magnetic monopoles in spin ice.
Event details
| Date | 24.04.2012 |
| Hour | 15:00 |
| Speaker | Prof. Steve Bramwell from London centre for Nanotechnology and University College London |
| Location |
PH L1 503
|
| Category | Conferences - Seminars |
The analogy between spin configurations in spin ice materials like Ho2Ti2O7 and proton configurations in water ice, H2O, has been appreciated for many years (see Ref. [1] for a review). However it is only in the last few years that this equivalence has been extended into the realm of electrodynamics [2,3]. In this talk I shall describe our recent experimental work that identifies emergent magnetic charges ("monopoles"), transient magnetic currents ("magnetricity") and the universal properties expected of an ideal magnetic Coulomb gas (magnetic electrolyte - "magnetolyte"). These universal properties include the Onsager-Wien effect, "corresponding states" behaviour, Debye-Huckel screening and Bjerrum pairing [4-6]. I will describe experimental results for both traditional spin ice materials (Ho2Ti2O7, Dy2Ti2O7) and a recently discovered system (Dy2Ge2O7).
Practical information
- Informed public
- Free
Organizer
- LQM
Contact
- Prof. Henrik Ronnow