IOPscience

Journal of Physics: Condensed Matter

Quick search Find article
Quick search
Find article
Journal of Physics: Condensed Matter Volume 15 Number 2 Create an alert RSS this journal

G Ehlers et al 2003 J. Phys.: Condens. Matter 15 L9 doi:10.1088/0953-8984/15/2/102

Dynamical crossover in 'hot' spin ice

FREE ARTICLE

G Ehlers1, A L Cornelius2, M Orendác3, M Kajnaková3, T Fennell4, S T Bramwell5,7 and J S Gardner6,7

Show affiliations

Tag this article Full text PDF (220 KB) View as HTML

Abstract References Cited By

LETTER TO THE EDITOR

The magnetic dynamics of the spin ice material Ho2Ti2O7 in its paramagnetic ('hot') phase have been investigated by a combination of neutron spin echo and ac-susceptibility techniques. Relaxation at high temperatures (T > 15 K) is proved to occur by a thermally activated single-ion process that is distinct from the process that dominates at lower temperatures (1 K < T < 15 K). It is argued that the low-temperature process must involve quantum mechanical spin tunnelling, as quasi-classical channels of relaxation are exhausted in this temperature range. Our results resolve a mystery in the physics of spin ice: why has a 15 K ac-susceptibility peak been observed in Dy2Ti2O7 but not in Ho2Ti2O7 or Ho2Sn2O7?


PACS

75.20.-g Diamagnetism, paramagnetism, and superparamagnetism

75.30.Wx Spin crossover

75.30.Cr Saturation moments and magnetic susceptibilities

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 2 (22 January 2003)

Received 2 October 2002

Published 20 December 2002



Your last 10 viewed
  1. Dynamical crossover in 'hot' spin ice

    G Ehlers et al 2003 J. Phys.: Condens. Matter 15 L9

  2. Nano-displacement measurements using spatially multimode squeezed light

    N Treps et al 2004 J. Opt. B: Quantum Semiclass. Opt. 6 S664

  3. Generation of a phase-flipped Gaussian mode for optical measurements

    V Delaubert et al 2002 J. Opt. A: Pure Appl. Opt. 4 393

  4. The risk of surprise in energy technology costs

    Nathan E Hultman and Jonathan G Koomey 2007 Environ. Res. Lett. 2 034002

  5. Shape memory alloy clamping devices of a capsule for monitoring tasks in the gastrointestinal tract

    A Menciassi et al 2005 J. Micromech. Microeng. 15 2045

  6. Topological aspects of the quantum Hall effect

    Y Hatsugai 1997 J. Phys.: Condens. Matter 9 2507

  7. Fabrication of GaAs quantum dots by droplet epitaxy on Si/Ge virtual substrate

    S Bietti et al 2009 IOP Conf. Ser.: Mater. Sci. Eng. 6 012009

  8. The Berry phase for spin in the Majorana representation

    J H Hannay 1998 J. Phys. A: Math. Gen. 31 L53

  9. Multi-peakons and a theorem of Stieltjes

    R Beals et al 1999 Inverse Problems 15 L1

  10. Electronic structure based on the local atomic environment for tight-binding bands

    R Haydock et al 1972 J. Phys. C: Solid State Phys. 5 2845

Users also read

What's this?
This innovative new feature generates a list of articles 'also read' by other users based on them reading the original article. Article abstracts citations and references are all considered and weighted accordingly. We hope that this will help you find relevant papers for your research.

  1. Evidence for two distinct spin relaxation mechanisms in 'hot' spin ice Ho2Ti2O7
  2. Low temperature magnetic properties of frustrated pyrochlore ferromagnets Ho2Sn2O7 and Ho2Ti2O7
  3. Novel dynamical magnetic properties in the spin ice compound Dy2Ti2O7

Related review articles

What's this?
View review articles related to this research to gain an insight into the key trends in this subject area. Related review articles are selected based on PACS/MSC codes, and are no more than three years old.

  1. NMR in Van Vleck magnetics and intermolecular interactions in molecular crystals and Chevrel phases
  2. Diamagnetic (Condon) domains

Share

View by subject




Export








Please login to access our web services, or create an account if you don't yet have one.

You must have cookies enabled in your web browser to be able to login.

Username
Password

Forgotten your password? Get a new one here.