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Related Concept Videos

Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
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Solid–Solid Solutions01:24

Solid–Solid Solutions

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Heating and Cooling Curves02:44

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Thermal resistance at a solid/superfluid helium interface.

Aymeric Ramiere1, Sebastian Volz2, Jay Amrit1

  • 1Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur, LIMSI-CNRS UPR 3251, Université Paris-Sud, Rue John von Neumann, 91405 Orsay, France.

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We discovered that surface roughness amplifies heat transfer across solid/superfluid helium interfaces. This resonant phonon scattering occurs when surface roughness matches the phonon thermal wavelength, impacting nanoscale heat monitoring device design.

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Area of Science:

  • Condensed Matter Physics
  • Low-Temperature Physics
  • Surface Science

Background:

  • Kapitza discovered thermal resistance at solid/superfluid helium interfaces in 1941.
  • Khalatnikov's theory predicts thermal resistance based on acoustic impedance mismatch at interfaces.
  • Experimental heat transmission at solid/superfluid interfaces is ~100x higher than Khalatnikov's prediction.

Discussion:

  • Discrepancy attributed to phonon scattering at the interface.
  • Previous studies lacked quantitative comparison between theory and experiment for scattering effects.
  • This study quantifies the role of surface roughness in phonon scattering.

Key Insights:

  • Heat flux across interfaces is amplified when phonon thermal wavelength (λ) approaches root-mean-square surface roughness (σ).
  • A spatial resonant mechanism occurs when σ ≈ 0.33λ, significantly enhancing heat transfer.
  • Controlled silicon single crystals and variable superfluid pressures (0.4–2 K) were used to validate findings.

Outlook:

  • Demonstrates physical conditions for resonant phonon scattering at all interfaces.
  • Provides a benchmark for designing nanoscale devices for precise heat monitoring.
  • Findings are crucial for thermal management in micro- and nano-scale systems.