Anomalous triple point effects in the spin-density-wave Cr1−xAlx alloy system

Effects of V concentration on the physical properties of Cr1−x Al x alloy system

“…The reason for the exceptional behaviour of Al solute atoms when added to the Cr matrix is still unknown. The unique behaviour of the Cr 1−x Al x alloy system was also revealed in the γ(x) diagram that shows a peak close to the TP concentration at the ISDW to CSDW phase transition [1]. Such a peak is reminiscence of the quantum critical Cr 1-z V z alloy system in which the peak observed in the alloy system is ascribed to spin-fluctuations at the ISDW to P phase boundary [4].…”

“…Such a peak is reminiscence of the quantum critical Cr 1-z V z alloy system in which the peak observed in the alloy system is ascribed to spin-fluctuations at the ISDW to P phase boundary [4]. Also of interest is the Nordheim-Gorter (N-G) relationship which fits very well but shows a minimum at the TP concentration [1,5]. The minimum is as a result of band structure changes occurring at the ISDW to CSDW phase transition [1,5].…”

“…Also of interest is the Nordheim-Gorter (N-G) relationship which fits very well but shows a minimum at the TP concentration [1,5]. The minimum is as a result of band structure changes occurring at the ISDW to CSDW phase transition [1,5]. The charge carrier density of the Cr 1−x Al x alloy system shows a sudden increase at the ISDW to CSDW phase transition.…”

“…The spin-density-wave (SDW) effects on the Cr 1−x Al x binary alloy system magnetic phase diagram is unusual as it renders a deep minimum at the triple point (TP) concentration, x t ≈ 0.02 [1][2][3]. This point is where the ISDW, CSDW and P phase lines intersect at approximately T = 0 K. The results of Sheppard et al [1] provides evidence of critical effects present at the triple point concentration in the Cr 1−x Al x alloy system. The reason for the exceptional behaviour of Al solute atoms when added to the Cr matrix is still unknown.…”

“…This drives the alloy system to QC at approximately w = 0.043 [12]. The base alloy Cr 98.4 Al 1.6 has a concentration of Al close to the TP [1].…”