Dear Yun Song A 62Ry cutoff could be quite poor both in the case of your NC Zn (it contains a quite deep 3d shell) and for your NC O. You should reach concergence with respect to the wf cutoff before attempting to perform phonon calculations. HTH Giuseppe
On Friday 14 October 2011 15:03:48 ?? ?? wrote: > Hi, > ? Recently,I generate Zn NC-PP using the PP library from qe-forge project. > I want to generate Zn.pz-nc.UPF using ld1.x. > My Zn.-nc.in is followed: > ?&input > ?? title='Zn', > ?? zed=30., > ?? rel=0, > ?? config='[Ar] 4s2.0 4p0.0 3d10.0', > ?? iswitch=3, > ?? dft='PZ' > ?/ > ?&inputp > ?? pseudotype=2, > ?? file_pseudopw='Zn.pz-nc.UPF', > ?? author='TM', > ?? lloc=0, > ?? nlcc=.true., > ?? tm=.true. > ?/ > 3 > 4P? 2? 1? 0.00? 0.00? 2.30? 2.30? 0.0 > 3D? 3? 2 10.00? 0.00? 2.30? 2.30? 0.0 > 4S? 1? 0? 2.00? 0.00? 2.30? 2.30? 0.0 > > > And I calculate ZnO vc-relax using Zn.pz-nc.UPF and O.pz-mt.UPF, > the theory is a=6.223 c/a=1.614, after calculating vc-relax is a=6.191 > c/a=1.614 with ecutwfc=62Ry. > > However, No matter how I try to calculate,the phonon frequency is negative > > The scf and ph file is followed: > &CONTROL > ???????????????? calculation = 'scf' , > ??????????????? restart_mode = 'from_scratch' , > ????????????????????? outdir = '/root/ZnO/915-phonon' , > ????????????????? pseudo_dir = '/root/pseudopotential' , > ????????????????????? prefix = 'ZnO' , > ?????????????? etot_conv_thr = 1.0D-5 , > ?????????????? forc_conv_thr = 1.0D-4 , > ???????????????????? tstress = .true. , > ???????????????????? tprnfor = .true. , > ?/ > ?&SYSTEM > ?????????????????????? ibrav = 4, > ?????????????????? celldm(1) = 6.191, > ?????????????????? celldm(3) = 1.614, > ???????????????????????? nat = 4, > ??????????????????????? ntyp = 2, > ???????????????????? ecutwfc = 62 , > ?/ > ?&ELECTRONS > ??????????????????? conv_thr = 1.0d-10 , > ???????????????? mixing_mode = 'plain' , > ???????????????? mixing_beta = 0.6 , > ???????????? diagonalization = 'david' , > ?/ > ATOMIC_SPECIES > ?? Zn?? 65.40900? Zn.pz-nc.UPF > ??? O?? 15.99940? O.pz-mt.UPF > ATOMIC_POSITIONS crystal > Zn?????? 0.333333333?? 0.666666667? -0.000036499?? 1 1 1 > Zn?????? 0.666666667?? 0.333333333?? 0.499963501?? 1 1 1 > O??????? 0.333333333?? 0.666666667?? 0.379036499?? 1 1 1 > O??????? 0.666666667?? 0.333333333?? 0.879036499?? 1 1 1 > K_POINTS automatic > ? 4 4 4?? 1 1 1 > > > > phonons of ZnO??????????????????????????????????????? > ?&INPUTPH > ????????????????????? outdir = '/root/ZnO/915-phonon' , > ????????????????????? prefix = 'ZnO' , > ????????????????????? fildyn = 'ZnO_IR.dyn' , > ??????????????????? fildvscf = 'ZnO.dv' , > ?????????????????????? ldisp = .true., > ???????????????????????? nq1 = 4 , > ???????????????????????? nq2 = 4 , > ???????????????????????? nq3 = 4 , > ?????????????????????? epsil = .false., > ??????????????????????? elph = .false., > ??????????????????????? fpol = .false. , > ???????????????????? recover = .false. , > ??????????????????? amass(1) = 65.4090, > ??????????????????? amass(2) = 15.9994, > ????????????????????? tr2_ph = 1.0d-12 , > ?/ > > Best > Regards > Yun Song,Kang > > Department Physical Science and Technology of Inner Mongolia University. -- ******************************************************** - Article premier - Les hommes naissent et demeurent libres et ?gaux en droits. Les distinctions sociales ne peuvent ?tre fond?es que sur l'utilit? commune - Article 2 - Le but de toute association politique est la conservation des droits naturels et imprescriptibles de l'homme. Ces droits sont la libert?, la propri?t?, la s?ret? et la r?sistance ? l'oppression. ******************************************************** ? ?Giuseppe Mattioli ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?CNR - ISTITUTO DI STRUTTURA DELLA MATERIA ? ? ?v. Salaria Km 29,300 - C.P. 10 ? ? ? ? ? ? ? ? ? ?I 00015 - Monterotondo Stazione (RM) ? ? ? ? ? ? ?Tel + 39 06 90672836 - Fax +39 06 90672316 ? ? ? ?E-mail: <giuseppe.mattioli at ism.cnr.it>
