Topological quenching of spin tunneling in Fe8-tacn molecules

Anupam Garg

doi:10.1016/S0921-4526(99)01675-0

Topological quenching of spin tunneling in Fe₈-tacn molecules

Anupam Garg

Physics and Astronomy

Research output: Contribution to journal › Conference article › peer-review

3 Scopus citations

Abstract

A Berry phase in the path integral for spin gives rise to an interference effect in the tunneling of a biaxially symmetric spin Hamiltonian. As the magnetic field applied along a hard axis is varied, the tunnel splitting between the two lowest energy states oscillates, with field values where it is completely quenched. This Hamiltonian is realized in Fe₈-tacn molecules, where these oscillations have just now been seen and provide, in fact, strong evidence for tunneling below 0.36 K in the first place.

Original language	English (US)
Pages (from-to)	269-270
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	280
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4526(99)01675-0
State	Published - May 11 2000
Event	22nd International Conference on Low Temperature Physics (LT-22) - Helsinki, Finl Duration: Aug 4 1999 → Aug 11 1999

ASJC Scopus subject areas

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

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10.1016/S0921-4526(99)01675-0

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title = "Topological quenching of spin tunneling in Fe8-tacn molecules",

abstract = "A Berry phase in the path integral for spin gives rise to an interference effect in the tunneling of a biaxially symmetric spin Hamiltonian. As the magnetic field applied along a hard axis is varied, the tunnel splitting between the two lowest energy states oscillates, with field values where it is completely quenched. This Hamiltonian is realized in Fe8-tacn molecules, where these oscillations have just now been seen and provide, in fact, strong evidence for tunneling below 0.36 K in the first place.",

author = "Anupam Garg",

note = "Funding Information: This work is supported by the US National Science Foundation (Grant no. DMR-9616749).; 22nd International Conference on Low Temperature Physics (LT-22) ; Conference date: 04-08-1999 Through 11-08-1999",

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T1 - Topological quenching of spin tunneling in Fe8-tacn molecules

AU - Garg, Anupam

N1 - Funding Information: This work is supported by the US National Science Foundation (Grant no. DMR-9616749).

PY - 2000/5/11

Y1 - 2000/5/11

N2 - A Berry phase in the path integral for spin gives rise to an interference effect in the tunneling of a biaxially symmetric spin Hamiltonian. As the magnetic field applied along a hard axis is varied, the tunnel splitting between the two lowest energy states oscillates, with field values where it is completely quenched. This Hamiltonian is realized in Fe8-tacn molecules, where these oscillations have just now been seen and provide, in fact, strong evidence for tunneling below 0.36 K in the first place.

AB - A Berry phase in the path integral for spin gives rise to an interference effect in the tunneling of a biaxially symmetric spin Hamiltonian. As the magnetic field applied along a hard axis is varied, the tunnel splitting between the two lowest energy states oscillates, with field values where it is completely quenched. This Hamiltonian is realized in Fe8-tacn molecules, where these oscillations have just now been seen and provide, in fact, strong evidence for tunneling below 0.36 K in the first place.

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U2 - 10.1016/S0921-4526(99)01675-0

DO - 10.1016/S0921-4526(99)01675-0

M3 - Conference article

AN - SCOPUS:0033901203

SN - 0921-4526

VL - 280

SP - 269

EP - 270

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-4

T2 - 22nd International Conference on Low Temperature Physics (LT-22)

Y2 - 4 August 1999 through 11 August 1999

ER -

Topological quenching of spin tunneling in Fe₈-tacn molecules

Abstract

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