6 -1 0 1 0 15  LaOFeAs  LaOFeSb  LaOFeBi DOS (states/eV/unit cell/spin) energy (eV)  LaOFeP FIG. 6: (Color online) Total density of states (DOS) for LaOFeAs, LaOFeSb and LaOFeBi in the low-temperature or- thorhombic phase with stripe-type antiferromagnetic order calculated by spin-polarized GGA. Also shown for compari- son is the DOS for nonmagnetic LaOFeP calculated by GGA. Relatively high DOS at the Fermi level is present in LaOFeP, indicating the possible instability with respect to supercon- ductivity in the absence of magnetic order. FIG. 5: (Color online) Static Pauli susceptibilities at q$_{0}$ = (0 , 0 , π ) and q$_{π}$ = ( π, π, π ) for LaOFe P n with P n =P, As, Sb, Bi. Here we use GGA for the DFT calculations. within a small energy window, the stronger peaks around q$_{π}$ = ( π, π, π ) compared to q$_{0}$ = (0 , 0 , π ) in all the 1111 compounds we studied makes other magnetic orderings besides the stripe-type antiferromagnetic one less favor- able. Combining the results from spin-polarized GGA (LSDA) calculations where magnetic moments on each iron are given as 2.2 (1.3) and 2.4 (1.8) µ$_{B}$ in LaOFeSb and LaOFeBi, respectively, we predict that the ground states of these two compounds at ambient pressure with- out doping should show stripe-type antiferromagnetic or- der although spin-polarized GGA (LSDA) calculations overestimate the magnetic moments. netic moments from the As to Bi compounds is observed. Such a conclusion is also confirmed by our LSDA calcula- tions. In Fig. 6, the DOS for LaOFeP is also shown. Since LaOFeP is nonmagnetic at low temperature, only the non-spinpolarized GGA result is presented. It is found that the DOS at the Fermi level remains relatively high, which indicates a possible instability with respect to su- perconductivity in the absence of magnetic order with the opening of a superconducting gap and the lifting of the degeneracy at the Fermi level. The increase of the magnetic moment from As to Sb to Bi can be understood from Fig. 5 where Pauli suscepti- bilities at q$_{0}$ = (0 , 0 , π ) and q$_{π}$ = ( π, π, π ) for LaOFe P n with P n =P, As, Sb, Bi are explicitly shown. While the increasing absolute value of χ$_{Pn}$ ( π, π, π ) as P n changes from P to Bi is probably responsible for the increasing magnetic moment, the difference between χ$_{Pn}$ ( π, π, π ) and χ$_{Pn}$ (0 , 0 , π ) dominates the possible competition be- tween different ordered states, which again implies a strong relation between Fermi surface nesting and mag- netism. Due to the fact that LaOFeAs is not a super- conductor without doping or application of pressure, we argue that possible superconducting states in LaOFeSb and LaOFeBi can only occur under doping or application of pressure. In Fig. 6, we display the DOS for LaOFeAs, LaOFeSb and LaOFeBi calculated within spin-polarized GGA cal- culations. It is shown that in all three cases the DOS at the Fermi level remains finite, suggesting that undoped LaOFeSb and LaOFeBi are stripe-type antiferromagnetic metals at ambient pressure as is the case of LaOFeAs or other iron-based superconductors. Our results from spin-polarized GGA calculations cannot corroborate the arguments introduced in Ref. 91 where it is argued that LaOFeSb and LaOFeBi could be antiferromagnetic Mott insulators, though the tendency towards larger Fe mag- Experimentally, the highest recorded superconducting transition temperature has been observed in the 1111 compounds. It is therefore tempting to find ways to pre- dict T$_{c}$ for hypothetical 1111 compounds. One promis- ing route is to consider a phenomenological relation be- tween T$_{c}$ and the χ ( π, π, π ) − χ (0 , 0 , π ) of the parent com- pound. As we know, with doping or application of pres- sure, the χ ( π, π, π ) instability is suppressed, resulting in the disappearance of stripe-type antiferromagnetic order. However, strong inter-band scattering with a wave vec- tor around ( π, π, π ) compared to intra-band scattering with a wave vector around (0 , 0 , π ) remains, which leads to a superconducting state. Therefore we argue that the larger the relative value of χ ( π, π, π )- χ (0 , 0 , π ) in the par- ent compound is, the stronger the antiferromagnetic spin fluctuation after suppression of magnetic order, and thus the higher the superconducting transition temperature will be. V. NEW SUPERCONDUCTOR CANDIDATES