Spin-glass-like behavior of Ge:Mn

Details Spin-glass-like behavior of Ge:Mn Spin-glass-like behavior of Ge:Mn

2006-04-03

arxiv.org/abs/cond-mat/0604041v2

Phys. Rev. B 74, 045330 (2006)

Physics

Condensed Matter

Materials Science

Revised version contains extended interpretation of experimental data

Scientific paper

10.1103/PhysRevB.74.045330

We present a detailed study of the magnetic properties of low-temperature-molecular-beam-epitaxy grown Ge:Mn dilute magnetic semiconductor films. We find strong indications for a frozen state of Ge_{1-x}Mn_{x}, with freezing temperatures of T_f=12K and T_f=15K for samples with x=0.04 and x=0.2, respectively, determined from the difference between field-cooled and zero-field-cooled magnetization. For Ge_{0.96}Mn_{0.04}, ac susceptibility measurements show a peak around T_f, with the peak position T'_f shifting as a function of the driving frequency f by Delta T_f' / [T_f' Delta log f] ~ 0.06, whereas for sample Ge_{0.8}Mn_{0.2} a more complicated behavior is observed. Furthermore, both samples exhibit relaxation effects of the magnetization after switching the magnitude of the external magnetic field below T_f which are in qualitative agreement with the field- and zero-field-cooled magnetization measurements. These findings consistently show that Ge:Mn exhibits a frozen magnetic state at low temperatures and that it is not a conventional ferromagnet.

Affiliated with

Also associated with

No associations

Rating

Spin-glass-like behavior of Ge:Mn does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spin-glass-like behavior of Ge:Mn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin-glass-like behavior of Ge:Mn will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-444509