Bulk modulus and thermal expansion of rare-earth tetraborides RB4 (R = Gd, Tb, Dy, Ho, and Tm) via in situ x-ray diffraction
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Systematic Elucidation of Pressure-Temperature Effects and Structural Anisotropy in Rare-Earth Borides RB4 Forming Shastry-Sutherland Lattices (SSL)
Precise determinations of the bulk modulus and thermal expansion coefficient were performed for the rare earth boride RB₄ with Shastry-Sutherland Lattices (SSL) using synchrotron X-ray diffraction experiments.The a-axis direction, characteristic of SSLs, is less compressible than the c-axis. Despite the increase in f-electrons, it exhibited nearly the same bulk modulus. This value lies between those of RB12 and RB6 and correlates with the R-B distance, independent of boron concentration in the crystal structure. Structural anisotropy is more pronounced at low temperatures than under high pressure, suggesting it results from magnetic interactions within the SSL lattice.
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Created at: 2025-09-09 03:11:30 +0900 Updated at: 2026-09-21 04:30:45 +0900