Suppression of macroscopic quantum coherence in magnetic particles by nuclear spins

Anupam K Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

The Néel vector of a small antiferromagnetic particle can in principle resonate between opposite directions. Nuclear spins strongly suppress this and related macroscopic quantum coherence (MQC), even when magnetic nuclei have only 2% abundance. The resonance signal breaks up into well separated groups of lines, and the highest frequency signal height increases with temperature as exp(-T02/T2). For a recent claim to have seen MQC in ferritin, less than 3.5% of the particles are found capable of contributing to the signal.

Original languageEnglish (US)
Pages (from-to)1458-1461
Number of pages4
JournalPhysical Review Letters
Volume74
Issue number8
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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