ADVANCED MATERIALS & PROCESSES | SEPTEMBER 2026 9 conductors to sustainable steels. The method works, in part, by capturing hidden patterns in the sample data. The group is now using the ap- proach to study how changing an alloy’s composition affects mechanical properties and radiation tolerance, with the goal of designing materials that remain strong and damage-tolerant in harsh environments. mit.edu. EXPLORING RESISTIVITY LIMITS IN METAL Scientists from the University of Toronto, L’École Normale Supérieure in Paris, and Lehigh University studied ultracold potassium atoms cooled to near absolute zero during research on electrical resistance. They found that as the rate of atomic collisions increases, the resulting resistance eventually stops increasing, offering new insights into what causes resistivity at the micro- scopic level. The study used an optical lattice, which is a grid of light that traps atoms and allows them to behave like electrons in a solid, to simulate extreme conditions not found in solids. “We observed that the atoms, which are only a few nanometers in size, bump into each other as if they were much larger,” says Professor Joseph Thywissen of the University of Toronto. “This quantum enhancement of the effective atom size makes collisions on a given lattice site much more likely, increasing the resistivity of the system.” The researchers found that when the interactions between atoms be- came very strong, the resistivity caused by collisions eventually stopped rising and reached a saturation point. This suggests that the resistivity increase from electron-on-electron scattering in a metal would also be limited for similar reasons. “Our results provide a clear microscopic understanding of how resistivity works in low-density metals and opens the door to new studies of strongly correlated atomic systems An artist’s impression of the resistivity that results from cold atomic collisions. Researchers investigating interactioninduced resistivity of ultracold atoms in a checkerboard-like landscape observe their likelihood of colliding, akin to how ducks moving in bubbles would collide. Courtesy of Haiwei Hou. and quantum materials,” says Thywissen. www.utoronto.ca. STATEMENT OF OWNERSHIP, MANAGEMENT, CIRCULATION, ETC. Required by the Act of 23 October 1962, Section 4369, Title 39, United States Code, showing the ownership, management, and circulation of Advanced Materials & Processes®, publishes six issues per year: January, March, May, July, September, and November at 9639 Kinsman Road, Materials Park, Ohio 44073, USPS #762-080. Annual subscription rate is $499. The publisher and editor are Scott D. Henry and Joanne Miller, respectively, both of 9639 Kinsman Road, Materials Park, Ohio 44073. The owner is ASM International®, Materials Park, Ohio, which is a not-for-profit educational institution, the officers being; President and Chair of the Board, Elizabeth Hoffman; Senior Vice President and Trustee, Daniel P. Dennies; Vice President and Trustee, Tirumalai Sudarshan; Immediate Past President and Trustee, Navin Manjooran; Executive Director, Veronica Becker; Treasurer and Trustee, William Jarosinski; Trustees, Rahul Gupta, Hanchen Huang, Victoria M. Miller, Christopher J. 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The actual number of copies of single issue published nearest to filing date is: (a) Total number of copies printed: 3,012; (b) Paid and/or requested circulation: (1) Paid/requested outside-county mail subscriptions: 2,433; (2) Paid in-county subscriptions: 0; (3) Sales through dealers and carriers, street vendors, counter sales, and other non-USPS paid distribution: 329; (4) other classes mailed through the USPS: 0; (c) Total paid and/or requested circulation: 2,762; (d.1) Free distribution or nominal outside-county: 56; (d.3) Free distribution by mail: 28; (e) Total free distribution: 84; (f) Total distribution: 2,846; (g) Copies not distributed: 523; (h) Total: 3,369; (i) Percent paid: 97. I certify that the statements made by me above are correct and complete. Scott D. Henry, Publisher
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