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We report a counter-intuitive self-heating effect of helium-4 superflow. Thisfundamentally unusual heating effect bears a phenomenological resemblance tothe Peltier effect of electric current across two different conductors. Itreveals that helium-4 superflow carries thermal energy and entropy, which is incontrast to the two-fluid model of superfluid helium-4. A natural understandingof this heating effect is provided by a recently developed microscopic quantumtheory of superfluid helium-4.

Experimental Observation of a Self-Heating Effect of Helium-4 Superflow