Abstract
Fluctuation-induced diamagnetism is observed well above ${T}_{c}$ in high-field torque magnetization measurements on the cuprate superconductor ${\mathrm{HgBa}}_{2}{\mathrm{Ca}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{8+\ensuremath{\delta}}.$ Universal scaling behavior anticipated by fluctuation theories is not observed in the high-field, high-temperature regime. A crossing point, where M reaches a field-independent value at a temperature which characterizes the interlayer separation, disappears in the fluctuation regime above $\ensuremath{\sim}{H}_{c2},$ suggesting that deviations from the lowest Landau level description of Ginzburg-Landau theory appear at high fields.
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