From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4

Carlo Vecchini; Dominic R. Ryan; Lachlam M.D. Cranswick; Marco Evangelisti; Winfried Kockelmann; Paulo G. Radaelli; Andrea Candini; Marco Affronte; Ian A. Gass; Euan K. Brechin; Oscar Moze

From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4

Carlo Vecchini, Dominic R. Ryan, Lachlam M.D. Cranswick, Marco Evangelisti, Winfried Kockelmann, Paulo G. Radaelli, Andrea Candini, Marco Affronte, Ian A. Gass, Euan K. Brechin, Oscar Moze

University of Brighton

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

Abstract

The molecular magnet Hpyr[Fe 17O16OH12py12Br4Br4] “Fe17” has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D ≈−0.02 K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations.

Original language	English
Journal	Physical Review B
Volume	77
Publication status	Published - 2 Jun 2008

Cite this

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title = "From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4",

abstract = "The molecular magnet Hpyr[Fe 17O16OH12py12Br4Br4] “Fe17” has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D ≈−0.02 K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations.",

author = "Carlo Vecchini and Ryan, {Dominic R.} and Cranswick, {Lachlam M.D.} and Marco Evangelisti and Winfried Kockelmann and Radaelli, {Paulo G.} and Andrea Candini and Marco Affronte and Gass, {Ian A.} and Brechin, {Euan K.} and Oscar Moze",

year = "2008",

month = jun,

day = "2",

language = "English",

volume = "77",

journal = "Physical Review B",

issn = "1098-0121",

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TY - JOUR

T1 - From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4

AU - Vecchini, Carlo

AU - Ryan, Dominic R.

AU - Cranswick, Lachlam M.D.

AU - Evangelisti, Marco

AU - Kockelmann, Winfried

AU - Radaelli, Paulo G.

AU - Candini, Andrea

AU - Affronte, Marco

AU - Gass, Ian A.

AU - Brechin, Euan K.

AU - Moze, Oscar

PY - 2008/6/2

Y1 - 2008/6/2

N2 - The molecular magnet Hpyr[Fe 17O16OH12py12Br4Br4] “Fe17” has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D ≈−0.02 K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations.

AB - The molecular magnet Hpyr[Fe 17O16OH12py12Br4Br4] “Fe17” has a well-defined cluster spin ground state of S=35/2 at low temperatures and an axial molecular anisotropy of only D ≈−0.02 K. Dipolar interactions between the molecular spins induce long-range magnetic order below 1.1 K. We report here the magnetic structure of Fe17, as determined by unpolarized neutron diffraction experiments performed on a polycrystalline sample of deuterated Fe17 in zero applied magnetic field. In addition, we report bulk susceptibility, magnetization, and specific heat data. The temperature dependence of the long-range magnetic order has been tracked and is well accounted for within mean-field theory. Ferromagnetic order along the crystallographic c axis of the molecular spins, as determined by the neutron diffraction experiments, is in agreement with ground-state dipolar energy calculations.

M3 - Article

SN - 1098-0121

VL - 77

JO - Physical Review B

JF - Physical Review B

ER -

From single-molecule magnetism to long-range ferromagnetism in Hpyr[Fe 17O16(OH)12(py)12Br4]Br4

Abstract

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