Have resonance experiments seen macroscopic quantum coherence in magnetic particles?

Anupam K Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Recent resonance experiments by Awschalom et al. on ferritin have been interpreted in terms of macroscopic quantum coherence (MQC). It is argued that this interpretation is implausible, as (i) the power absorption exceeds a very weak upper bound predicted by MQC, (ii) the variation of lineshape and height with external magnetic field is far smaller than expected, and (iii) the very narrow line leaves no room for either dissipative or for inhomogeneous broadening due to polydispersity or stray fields. Electron spin resonance is presented as a more plausible explanation.

Original languageEnglish (US)
Pages (from-to)325-326
Number of pages2
JournalPhysica B: Physics of Condensed Matter
Issue numberPART 1
StatePublished - Feb 2 1994

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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