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- W2057932636 abstract "The differential susceptibility $dM/dH$ of $[mathrm{Fe}(mathrm{salen})mathrm{Cl}{]}_{2}$ where salen is ${N,N}^{ensuremath{'}}$ethylenebis(salicylideneiminato), was measured in pulsed magnetic fields up to 550 kOe. The samples were in a capsule that was immersed in a liquid-helium bath maintained at a temperature $1.5<~{T}_{mathrm{bath}}<~4.2mathrm{K}.$ Three magnetization steps (MST's) arising from energy-level crossings for the ${mathrm{Fe}}^{3+}$ dimer were observed as peaks in $dM/dH.$ The intradimer exchange constant obtained from the MST's is $J=ensuremath{-}8.4ifmmodepmelsetextpmfi{}0.2{mathrm{cm}}^{mathrm{ensuremath{-}}1},$ assuming a g factor of 2.00. The line shapes of the peaks in $dM/dH$ strongly suggest the existence of weak interactions that are not included in the conventional model of independent dimers with isotropic intradimer exchange only. The missing weak interactions are yet to be identified. The narrow widths of the peaks in $dM/dH$ indicate strong departures from thermal equilibrium with the helium bath during the field pulse (milliseconds duration). Such narrow widths are the result of cooling by the magnetocaloric effect. The cooling, and therefore the line shapes of the $dM/dH$ peaks, depended on the arrangement for the sample-to-bath heat flow during the field pulse. With one heat-flow arrangement hysteresis was observed. Computer simulations of the line shape resulting from the magnetocaloric effect during the field pulse reproduce the narrow widths and the hysteresis. Data for the low-field magnetic susceptibility between 2 and 300 K, measured in steady fields, gave $Jensuremath{cong}ensuremath{-}8{mathrm{cm}}^{mathrm{ensuremath{-}}1}.$" @default.
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- W2057932636 date "1999-01-01" @default.
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- W2057932636 title "Magnetization steps in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mo>[</mml:mo><mml:mi mathvariant=normal>Fe</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant=normal>salen</mml:mi><mml:mo>)</mml:mo><mml:mi mathvariant=normal>Cl</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>]</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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- W2057932636 doi "https://doi.org/10.1103/physrevb.59.1046" @default.
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