Magnetism in Mn-rich Heusler compounds
[Pages:37]Magnetism in Mn-rich Heusler compounds
Claudia FELSER, Ajaya K. NAYAK, Daniel EBKE, Gerhard H. FECHER, Lukas WOLLMANN, J?rgen K?BLER, Olga MESHCHERIAKOVA, Stas CHADOV
superconductivity.de
Co-workers in Dresden and elsewhere
Dresden group
T. Miyazaki, S. Mizukami et al. Tohoku, Sendai
G. Reiss et al. Bielefeld, G. Jakob, M. Jourdan Mainz +
S. S. P. Parkin et al. IBM Almaden, MPI Halle M. Coey, Dublin
Half metallic Ferromagnets
Wollmann et al., APL Mat. 3 (2015) 041518 Graf T, Felser C, Parkin SSP, Progress in Solid State Chemistry (2011) 1
Kandpal et al., CF J. Phys. D 39 (2006) 776
Ternary Semiconductors ...
Synthesis
Ga
As
13 + 5 = 18
Co
Ti
Sb
9 + 4 + 5 = 18
Fe2
Ti
Sn
2*8 + 4 + 4 = 24
additional t2-levels
Materials: ... to half metallic ferromagnets
X2YZ
+e-
Example: Co2MnSi magic valence electron number: 24 valence electrons = 24 + magnetic moments
Co2MnSi: 29 + 7 + 4 = 29 Ms = 5mB
EF
K?bler et al., PRB 28, 1745 (1983) Galanakis et al., PRB 66, 012406 (2002)
Tunability Co2YZ
m (Co) ~ 1mB m (Mn) ~ 3mB Exchange coupling: ferro
Kandpal et al., J. Phys. D 40 (2007) 1507. Balke et al. Solid State Com. 150 (2010) 529 K?bler et al., Phys. Rev. B 76 (2007) 024414
Ferrimagnetic Heusler compounds
K?bler's Rule Slater Pauling Rule
X2MnGa
Two magnetic sublattices 24 Valence electrons ? 0 mB Mn3+ at octahedral site ? 4 mB Mn compensates
Mn2MnGa 3*7 + 3 = 24 Compensated ferrimagnet
K?bler et al., Phys. Rev. B (1983)
Wurmehl, et al., J. Phys. Cond. Mat. 18 (2006) 6171 Balke et al. CF, APL 90 (2007) 152504
Mn2-Heusler compounds
V Cr Mn Fe Co Ni
regular Y Heusler structure
Y
MnYMn Z
inverse Heusler structure
Wollmann et al., APL Mat. 3 (2015) 041518 Graf T, Felser C, Parkin SSP, Progress in Solid State Chemistry (2011),
Mn2VGa + Fe2MnGa = compensated
Wurmehl, et al., J. Phys. Cond. Mat. 18 (2006) 6171
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