Pressure-Induced "Hardening" ofQ-Vector Locking in Chromium

Abstract
An irreversible change with pressure of the spin-density wave mismatch parameter δ has been observed in single-Q chromium at 4.2 K. This change, which appears to be analogous to a metallurgical "hardening," can be annealed out by raising the temperature to 80 K. The pressure derivative in the "soft" mode matches that found in high-pressure de Haas-van Alphen studies while the "hard"-mode result is consistent with magnetostriction measurements; so the apparent discrepancy is resolved.
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