Quantum dynamics of molecular magnets in ultra-fast sweeping magnetic fields

Hiroyuki Nojiri; Tomohiro Taniguchi; Yoshitami Ajiro; Achim Müller; Bernard Barbara

doi:10.1016/j.physb.2004.01.053

Quantum dynamics of molecular magnets in ultra-fast sweeping magnetic fields

Hiroyuki Nojiri, Tomohiro Taniguchi, Yoshitami Ajiro, Achim Müller, Bernard Barbara

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

26 Citations (Scopus)

Abstract

Non-equilibrium magnetization process of a S=1/2 spin triangle in molecular magnet V₁₅ has been studied by using fast sweeping pulsed magnetic fields. In the up sweep, the magnetization jump of about 1μ_B is found at the level crossing between the ground S=1/2 and the excited S=3/2 states, while it is about 2μ_B in the down sweep. The jump in the up sweep is half of that expected in the equilibrium magnetization process. This phenomenon is interpreted by considering the difference of mixing in two degenerated S=12 states with the S=3/2 state.

Original language	English
Pages (from-to)	216-220
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	346-347
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physb.2004.01.053
Publication status	Published - 2004 Apr 30
Externally published	Yes
Event	Proceedings of the 7th International Symposium on Research - Toulouse, France Duration: 2003 Jul 20 → 2003 Jul 23

Keywords

Complex pulsed field
Frustration
Molecular magnet
Quantum dynamics
Quantum tunneling

ASJC Scopus subject areas

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

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title = "Quantum dynamics of molecular magnets in ultra-fast sweeping magnetic fields",

abstract = "Non-equilibrium magnetization process of a S=1/2 spin triangle in molecular magnet V15 has been studied by using fast sweeping pulsed magnetic fields. In the up sweep, the magnetization jump of about 1μB is found at the level crossing between the ground S=1/2 and the excited S=3/2 states, while it is about 2μB in the down sweep. The jump in the up sweep is half of that expected in the equilibrium magnetization process. This phenomenon is interpreted by considering the difference of mixing in two degenerated S=12 states with the S=3/2 state.",

keywords = "Complex pulsed field, Frustration, Molecular magnet, Quantum dynamics, Quantum tunneling",

author = "Hiroyuki Nojiri and Tomohiro Taniguchi and Yoshitami Ajiro and Achim M{\"u}ller and Bernard Barbara",

year = "2004",

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doi = "10.1016/j.physb.2004.01.053",

language = "English",

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TY - JOUR

T1 - Quantum dynamics of molecular magnets in ultra-fast sweeping magnetic fields

AU - Nojiri, Hiroyuki

AU - Taniguchi, Tomohiro

AU - Ajiro, Yoshitami

AU - Müller, Achim

AU - Barbara, Bernard

PY - 2004/4/30

Y1 - 2004/4/30

N2 - Non-equilibrium magnetization process of a S=1/2 spin triangle in molecular magnet V15 has been studied by using fast sweeping pulsed magnetic fields. In the up sweep, the magnetization jump of about 1μB is found at the level crossing between the ground S=1/2 and the excited S=3/2 states, while it is about 2μB in the down sweep. The jump in the up sweep is half of that expected in the equilibrium magnetization process. This phenomenon is interpreted by considering the difference of mixing in two degenerated S=12 states with the S=3/2 state.

AB - Non-equilibrium magnetization process of a S=1/2 spin triangle in molecular magnet V15 has been studied by using fast sweeping pulsed magnetic fields. In the up sweep, the magnetization jump of about 1μB is found at the level crossing between the ground S=1/2 and the excited S=3/2 states, while it is about 2μB in the down sweep. The jump in the up sweep is half of that expected in the equilibrium magnetization process. This phenomenon is interpreted by considering the difference of mixing in two degenerated S=12 states with the S=3/2 state.

KW - Complex pulsed field

KW - Frustration

KW - Molecular magnet

KW - Quantum dynamics

KW - Quantum tunneling

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