We report thermoelectric generation caused by nuclear spins in a solid: nuclear-spin Seebeck effect. The sample is a magnetically ordered material MnCO3 having a large nuclear spin (I = 5/2) of 55Mn nuclei and strong hyperfine coupling, with a Pt contact. In the system, we observe low-temperature thermoelectric signals down to 100 mK due to nuclear-spin excitation. The results were quantitatively reproduced by a theoretical calculation in which interfacial Korringa process is taken into consideration. The nuclear thermoelectric effect demonstrated here offers a new way for exploring thermoelectric science and technologies at ultralow temperatures.
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