Table 2 Ising model for the tetragonal phase.

From: Order from disorder phenomena in BaCoS2

(a)

orbital configuration

E

ΔE

xyyx

−2Γ1

0

xyxy

−2σδΓ1

2Γ1 − 2σδΓ1

xxyy

2σδΓ1

2Γ1 + 2σδΓ1

xxxx

2Γ1 − σBτ

4Γ1 − σBτ

yyyy

2Γ1 + σBτ

4Γ1 + σBτ

(b)

 

Γ1(K)

δΓ1(K)

Bτ(K)

C-AFS

33 ± 4

10

60

G-AFS

31 ± 4

6

49

  1. The energies of the different orbital configurations within an assumed nearest neighbour antiferromagnetic Ising model with exchange constants Γ1 + σδΓ1 along a, Γ1 − σδΓ1 along b, and uniform pseudo-magnetic field σBτ are listed in (a). The values of those parameters extracted through Table 1 for antiferromagnetic stripe (AFS) ordering are shown in (b). We just consider the C-type orbital stacked configurations, since the G-type ones do not allow fixing Bτ.
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