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Ruddlesden-Popper chalcogenides push the limit of mechanical stiffness and glass-like thermal conductivity in single crystals

https://doi.org/10.1038/s41467-025-61078-5

Hoque, Md_Shafkat Bin; Hoglund, Eric R; Zhao, Boyang; Bao, De-Liang; Zhou, Hao; Thakur, Sandip; Osei-Agyemang, Eric; Hattar, Khalid; Scott, Ethan A; Surendran, Mythili; et al (December 2025, Nature Communications)

Free, publicly-accessible full text available December 1, 2026
Increased thermal conductivity and decreased electron–phonon coupling factor of the aluminum scandium intermetallic phase (Al3Sc) compared to solid solutions

https://doi.org/10.1063/5.0201763

Hirt, Daniel; Islam, Md Rafiqul; Hoque, Md_Shafkat Bin; Hutchins, William; Makarem, Sara; Lenox, Megan K; Riffe, William T; Ihlefeld, Jon F; Scott, Ethan A; Esteves, Giovanni; et al (May 2024, Applied Physics Letters)

Aluminum scandium alloys and their intermetallic phases have arisen as potential candidates for the next generation of electrical interconnects. In this work, we measure the in-plane thermal conductivity and electron–phonon coupling factor of aluminum scandium alloy thin films deposited at different temperatures, where the temperature is used to control the grain size and volume fraction of the Al3Sc intermetallic phase. As the Al3Sc intermetallic formation increases with higher deposition temperature, we measure increasing in-plane thermal conductivity and a decrease in the electron–phonon coupling factor, which corresponds to an increase in grain size. Our findings demonstrate the role that chemical ordering from the formation of the intermetallic phase has on thermal transport.
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Hydrogen effects on the thermal conductivity of delocalized vibrational modes in amorphous silicon nitride $(a − {SiN}_{x} : H)$

https://doi.org/10.1103/PhysRevMaterials.5.035604

Braun, Jeffrey L.; King, Sean W.; Hoglund, Eric R.; Gharacheh, Mehrdad Abbasi; Scott, Ethan A.; Giri, Ashutosh; Tomko, John A.; Gaskins, John T.; Al-kukhun, Ahmad; Bhattarai, Gyanendra; et al (March 2021, Physical Review Materials)
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Thermal conductivity of (Ge ₂ Sb ₂ Te ₅ ) _1−x C _x phase change films

https://doi.org/10.1063/5.0023476

Scott, Ethan A.; Ziade, Elbara; Saltonstall, Christopher B.; McDonald, Anthony E.; Rodriguez, Mark A.; Hopkins, Patrick E.; Beechem, Thomas E.; Adams, David P. (October 2020, Journal of Applied Physics)

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