Effect of hydrostatic pressure in degenerate Ge1−xMnxTe

Abstract

We utilize the effect of hydrostatic pressure to investigate the magnetotransport properties of degenerate p-Ge1−xMnxTe (x=0.10) ferromagnetic semiconductor. The Curie temperature was found to increase with pressure as 0.27 K/kbar, which can be understood on the basis of the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction mechanism. For sufficiently high carrier concentration of po∼1021 cm−3, both the light holes from the L valence band and the heavy holes from the Σ valence band contribute to the RKKY interaction. Additionally, a negative magnetoresistance is observed at low temperature and is found to decrease with pressure.

Spinodal decomposition to control magnetotransport in (Ge,Mn) films

“…5͑a͔͒: we show now that this is due to 2D weak localization in the As-doped layer, which vanishes when the field is applied in plane ͑ =0͒. Weak localization and anisotropic magnetoresistance were also observed in degenerate p-Ge 1−x Mn x Te ͑x Ն 0.1͒ by Fukuma et al 28 and Lim et al, 29 respectively. The low-field isotropic part ͓Figs.…”

Half-metallicity and magnetism of GeTe doped with transition metals V, Cr, and Mn: A theoretical study from the viewpoint of application in spintronics

“…Experimentally, Ge 1Àx Mn x Te alloys, with X ¼ Cr, Mn, Fe have been reported to exhibit ferromagnetic behavior [11][12][13][14][15][16][17][18][19][20][21] over wide range of the concentration x. The structure of these compounds, grown as thin films, is usually found to be RS or small deviations from this.…”

“…Recently, a large number of experimental studies related to magnetism and magnetic transitions in several Ge-Te based alloys, such as Ge-Cr-Te, Ge-Mn-Te, and Ge-Fe-Te) have been reported. [11][12][13][14][15][16][17][18][19][20][21] In addition, there is substantial amount work on DMSs in general (for a review see Ref. 22), where the magnetic properties arise via percolation effects among a very small concentration of the magnetic atoms.…”

Magnetic interactions in spin-glasslikeGe1−x−ySnxMnyTeKilański1, Szymcżak2, Dobrowolski3 et al. 2010Phys. Rev. B261130View full textAdd to dashboardCite

“…[4][5][6][7][8][9] The progress in the methods of growth of this compound allowed the increase in the observed Curie temperatures to values as high as 200 K ͑Ref. 6͒ and gives hope to obtain the room-temperature ferromagnetism.…”