Search for pressure-induced tricriticality in Cr Article Swipe
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· 2019
· Open Access
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· DOI: https://doi.org/10.1103/physrevb.100.035122
· OA: W2901321359
The antiferromagnetic ordering of chromium has long been known for its\npeculiar physical properties. One of them is the observation of the weak\nfirst-order character of the N'eel transition that is explained by the lack of\na stable fixed point by Bak and Mukamel. Barak et al. predicted that by\nlowering the symmetry of the order parameter by the application of uniaxial\npressure along the [110] direction changes the N'eel transition to\nsecond-order. In a previous experiment by Fawcett et al., irreversible\nbroadening of the N\\'eel transition was already observed between 160 bar and\n300 bar, which could, however, be caused by plastic deformation. Using an\nimproved setup with reduced stress inhomogeneities we succeeded to increase the\npressure range until irreversible broadening is observed above 450 bar. Despite\nthe observed tripling of the intensity of the magnetic Bragg peak $[0, 0,\n1-\\delta]$ at $p_{[110]}\\geq450\\,$bar, indicating a single\n$\\bf{\\text{Q}}_\\pm$-domain state of the sample, no hints for a tricritical\npoint were observed.\n
