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- W2756228023 abstract "Magnetocaloric effect in the Haldane-gap $S=1$ spin-chain $[mathrm{Ni}{({mathrm{C}}_{2}{mathrm{H}}_{8}{mathrm{N}}_{2})}_{2}{mathrm{NO}}_{2}]({mathrm{BF}}_{4})$ was investigated at low temperatures $({k}_{B}Tensuremath{ll}J)$ and magnetic fields up to nominally $0.1{B}_{mathrm{sat}}$, where $J$ and ${B}_{mathrm{sat}}$ denote an exchange interaction and saturation magnetic field, respectively. Magnetic entropy was found to scale as $exp(mathrm{ensuremath{Delta}}/{k}_{B}T)$ in zero magnetic field and ${T}^{0.67}$ for $B={B}_{c}$, in which the Haldane gap should be closed, in reasonable agreement with the theoretical predictions. The existence of the inverse magnetocaloric effect for $B<{B}_{c}$ was confirmed. The occurrence of normal magnetocaloric response at lowest temperatures and magnetic fields was attributed to $S=1/2$ degrees of freedom arising from the ends of chain segments." @default.
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- W2756228023 date "2017-09-20" @default.
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- W2756228023 title "Specific heat study of the magnetocaloric effect in the Haldane-gap <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:math> spin-chain material <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mi>Ni</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant=normal>C</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal…" @default.
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- W2756228023 doi "https://doi.org/10.1103/physrevb.96.094425" @default.
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