Effects of magnetic order on elastic moduli of chromium

First-principles study of elastic properties of Cr- and Fe-rich Fe-Cr alloys

“…[4][5][6][7] However, this study is mostly concerned with the elastic properties in the paramagnetic state, which is modeled here using the DLM approach. Let us note that, according to the EMTO-CPA calculations in the paramagnetic DLM state, sizable magnetic moments remain on the Fe atoms, but disappear on the Cr atoms.…”

“…8,9 Let us note that the elastic moduli of pure Cr have been experimentally found to exhibit a pronounced nonmonotonic variation (a 30% drop in bulk modulus, for example) in a range of temperatures (±100 K) around the Néel temperature. 5 Such an extreme temperature dependence is a consequence of both the gradual and abrupt changes in the magnetic state of Cr, which can not be fully described using the theoretical techniques available to us. This circumstance should be kept in mind when making comparison between theoretical and experimental results for pure Cr or Cr-rich alloys.…”

“…At first sight, the elastic properties of this system seem to be quite well established from both experimental [3][4][5][6][7][8][9][10][11][12] and theoretical [13][14][15][16][17][18] points of view. However, there are many complicated features of this system on both Fe-and Crrich sides.…”

Magnetoelastic properties of single-S, single-Qchromium

“…His predictions about the nature of the magnetic anomalies in the various elastic moduli at the Neel temperature 7"N have remained largely untested, despite refinements of the experiments on singlecrystal samples, [4][5][6][7] since the work of Bolef and de Klerk. 2 We present here a preliminary report on the first experimental study 1 of the elastic moduli of single-S, single-Q Cr.…”

“…The disordered phase of Cr exhibits magnetic anomalies well above T^ in both the thermal expansion 10 and AC,0) -~ (//r N )9 2 AF/S/ 2 = -0//"(/)/r N , the elastic moduli, 5,6 so that in practice the reference system used instead of the high-temperature disordered phase of Cr is the alloy Cr9sV 5 . This alloy is paramagnetic, but otherwise might be expected to be close to Cr in its thermophysical properties, so that effectively it may be regarded as "paramagnetic chromium."…”