Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8

A. Honecker; F. Meier; D. Loss; B. Normand

doi:10.1140/epjb/e2002-00182-1

Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe₆ and Fe₈

A. Honecker^*
, F. Meier
, D. Loss
, B. Normand

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

We present detailed calculations of low-energy spin dynamics in the "ferric wheel" systems Na:Fe₆ and Cs:Fe₈ in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and Néel-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the Néel vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.

Original language	English
Pages (from-to)	487-495
Number of pages	9
Journal	European Physical Journal B
Volume	27
Issue number	4
DOIs	https://doi.org/10.1140/epjb/e2002-00182-1
State	Published - 2 Jun 2002
Externally published	Yes

Keywords

03.65.Sq Semiclassical theories and applications
73.40.Gk Tunnelling
75.10.Jm Quantised spin models
75.30.Gw Magnetic anisotropy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1140/epjb/e2002-00182-1

Cite this

@article{18792e110a574d0bab437cba6a88505e,

title = "Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8",

abstract = "We present detailed calculations of low-energy spin dynamics in the {"}ferric wheel{"} systems Na:Fe6 and Cs:Fe8 in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and N{\'e}el-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the N{\'e}el vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.",

keywords = "03.65.Sq Semiclassical theories and applications, 73.40.Gk Tunnelling, 75.10.Jm Quantised spin models, 75.30.Gw Magnetic anisotropy",

author = "A. Honecker and F. Meier and D. Loss and B. Normand",

year = "2002",

month = jun,

day = "2",

doi = "10.1140/epjb/e2002-00182-1",

language = "English",

volume = "27",

pages = "487--495",

journal = "European Physical Journal B",

issn = "1434-6028",

publisher = "Springer New York",

number = "4",

}

TY - JOUR

T1 - Spin dynamics and coherent tunnelling in the molecular magnetic rings Fe6 and Fe8

AU - Honecker, A.

AU - Meier, F.

AU - Loss, D.

AU - Normand, B.

PY - 2002/6/2

Y1 - 2002/6/2

N2 - We present detailed calculations of low-energy spin dynamics in the "ferric wheel" systems Na:Fe6 and Cs:Fe8 in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and Néel-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the Néel vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.

AB - We present detailed calculations of low-energy spin dynamics in the "ferric wheel" systems Na:Fe6 and Cs:Fe8 in a magnetic field. We compute by exact diagonalisation the low-energy spectra and matrix elements for total-spin and Néel-vector components, and thus the time-dependent correlation functions of these operators. Comparison of our results with the semiclassical theory of coherent quantum tunnelling of the Néel vector demonstrates the validity of a two-state description for the low-energy dynamics of ferric wheels. We discuss the implications of our results for mesoscopic quantum coherent phenomena, and for the experimental techniques to observe them, in molecular magnetic rings.

KW - 03.65.Sq Semiclassical theories and applications

KW - 73.40.Gk Tunnelling

KW - 75.10.Jm Quantised spin models

KW - 75.30.Gw Magnetic anisotropy

UR - https://www.scopus.com/pages/publications/0012399264

U2 - 10.1140/epjb/e2002-00182-1

DO - 10.1140/epjb/e2002-00182-1

M3 - Article

AN - SCOPUS:0012399264

SN - 1434-6028

VL - 27

SP - 487

EP - 495

JO - European Physical Journal B

JF - European Physical Journal B

IS - 4

ER -