Electron magnetic resonance and SQUID measurement study of natural A -DNA in dry state

Chang Hoon Lee, Young Wan Kwon, Eui Doo Do, Dong Hoon Choi, Jung Il Jin, Dong Keun Oh, Joon Kim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We present electron magnetic resonance study on the magnetization of fibrous salmon sperm A -DNA in dry state. Appearance of a unusually broad signal around 500 G overlapped with a narrower signal at about 3000 G persisted over the whole temperature range of 4.5-300 K. The results are explained by assuming coexistence of an applied magnetic field-induced mesoscopic orbital magnetism associated with a long-range coherent transport in well ordered regions and a Pauli paramagnetism arisen from an incoherent hopping transport in disordered regions. In the molecularly ordered regions, the partial interbase hybridization of πz orbitals along the double helix axis is envisaged, whereas it is inhibited in the disordered regions due to structural defects and conformational irregularities along the backbone of the duplex. The spins located in the former regions exhibit the g value greater than 10, while those in the latter regions exhibid the g value of about 2.0. dc magnetic behavior of the natural A -DNA observed by the SQUID measurements also supports the explanation by a temperature-independent S-shaped magnetization accompanied with a linear Pauli susceptibility. We learn from the experimental results and the proposed model that the charge carriers are coherently transported giving rise to a strong orbital magnetic moment in the ordered regions.

Original languageEnglish
Article number224417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number22
DOIs
Publication statusPublished - 2006 Jun 21

Fingerprint

A-Form DNA
Electron resonance
SQUIDs
Magnetic resonance
magnetic resonance
Magnetization
DNA
deoxyribonucleic acid
Paramagnetism
orbitals
Magnetism
Magnetic moments
Charge carriers
magnetization
electrons
paramagnetism
Magnetic fields
irregularities
helices
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electron magnetic resonance and SQUID measurement study of natural A -DNA in dry state. / Hoon Lee, Chang; Kwon, Young Wan; Do, Eui Doo; Choi, Dong Hoon; Jin, Jung Il; Oh, Dong Keun; Kim, Joon.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 73, No. 22, 224417, 21.06.2006.

Research output: Contribution to journalArticle

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