Table 2 NN and NNN exchange interaction strengths in YBa1−xSr x CuFeO5 in meV.

From: Nature of spiral state and absence of electric polarisation in Sr-doped YBaCuFeO5 revealed by first-principle study

x

J1

J2

J3

J4

Jp1

Jp2

J NNN

0.00

−2.016

−2.016

14.01

2.86

149.5

8.78

−0.069

0.25

−2.383

−1.783

13.52

2.68

150.5

8.95

−0.087

0.50

−2.766

−1.646

13.10

2.59

155.5

9.15

−0.117

0.75

−2.511

−1.940

12.59

2.40

146.7

9.27

−0.095

1.00

−2.325

−2.325

12.27

2.31

147.6

9.41

−0.087

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