[QE-users] supercell

Yue-Wen Fang yuewen.fang at gmail.com
Mon Jul 6 02:16:26 CEST 2020


This error info. has already told you how to fix this problem:
ibrav=0: must read cell parameters
So you must use CELL PARAMETERS in the input file.

Neelam Swarnkar <neelamswarnkar35 at gmail.com> 于2020年7月4日周六 下午9:33写道:

> Thanks for reply Yue-Wen
>
> I used the supercell 001 file to further calculation of SCF. in QE-6.3
>
> But it has an error .
>
> input file
> &control
>     calculation = 'scf',
>     prefix = '2d_exc1',
>     outdir = './tmp/'
>     pseudo_dir = './'
>     verbosity = 'high'
>
>  /
>  &system
>     ibrav =  0,
>     celldm(1)= 23.1132402,
>     celldm(3)= 1.016106614,
>     nat =  24,
>     ntyp = 2,
>     occupations='smearing', degauss=0.02,
>     ecutwfc = 27,
>     ecutrho = 136
>
>  /
>  &electrons
>     mixing_beta = 0.6
>  /
>
>  ATOMIC_SPECIES
>  Zn 60.00  Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
>  Sb 102.00 Sb.pbe-n-kjpaw_psl.1.0.0.UPF
>
> ATOMIC_POSITIONS crystal
>  Zn   0.5004326526196012  0.8660250000000002  0.0161070000000001
>  Zn   0.0000000000000000  0.8660250000000002  0.0161070000000001
>  Zn   0.5080535000000000  0.0000000000000000  0.8660249999999999
>  Zn   0.0080534999999999  0.0000000000000000  0.8660249999999999
>  Zn   0.4330125000000000  0.0161070000000001  0.0000000000000000
>  Zn   0.9330125000000000  0.0161070000000001  0.0000000000000000
>  Zn   0.8169875000000000  0.5000000000000000  0.4838930000000000
>  Zn   0.3169875000000000  0.5000000000000000  0.4838930000000000
>  Zn   0.7419465000000001  0.6339750000000000  0.4999999999999999
>  Zn   0.2419465000000000  0.6339750000000000  0.4999999999999999
>  Zn   0.7500000000000000  0.4838930000000000  0.6339749999999998
>  Zn   0.2500000000000000  0.4838930000000000  0.6339749999999998
>  Sb   0.5000000000000000  0.1339750000000000  0.9838929999999998
>  Sb   0.0000000000000000  0.1339750000000000  0.9838929999999998
>  Sb   0.4919465000000000  0.0000000000000000  0.1339750000000000
>  Sb   0.9919465000000000  0.0000000000000000  0.1339750000000000
>  Sb   0.5669875000000000  0.9838930000000000  0.0000000000000000
>  Sb   0.0669875000000000  0.9838930000000000  0.0000000000000000
>  Sb   0.1830125000000000  0.5000000000000000  0.5161070000000000
>  Sb   0.6830124999999999  0.5000000000000000  0.5161070000000000
>  Sb   0.2580535000000000  0.3660250000000000  0.4999999999999999
>  Sb   0.7580534999999998  0.3660250000000000  0.4999999999999999
>  Sb   0.2500000000000000  0.5161070000000000  0.3660250000000000
>  Sb   0.7500000000000000  0.5161070000000000  0.3660250000000000
>
>
> K_POINTS (automatic)
>  4 4 4 0 0 0
>
>
> output file.
> Program PWSCF v.6.3 starts on  4Jul2020 at 17:54:48
>
>      This program is part of the open-source Quantum ESPRESSO suite
>      for quantum simulation of materials; please cite
>          "P. Giannozzi et al., J. Phys.:Condens. Matter 21 395502 (2009);
>          "P. Giannozzi et al., J. Phys.:Condens. Matter 29 465901 (2017);
>           URL http://www.quantum-espresso.org",
>      in publications or presentations arising from this work. More details
> at
>      http://www.quantum-espresso.org/quote
>
>      Parallel version (MPI), running on     1 processors
>
>      MPI processes distributed on     1 nodes
>      Waiting for input...
>      Reading input from standard input
>
>      Current dimensions of program PWSCF are:
>      Max number of different atomic species (ntypx) = 10
>      Max number of k-points (npk) =  40000
>      Max angular momentum in pseudopotentials (lmaxx) =  3
>
>
>  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>      Error in routine cell_base_init (1):
>      ibrav=0: must read cell parameters
>
>  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
>      stopping ...
>
> error in ibrav=0 , how to run scf calculation in QE.
>
> regards
> Neelam Swarnkar
> Phd scholar
> RGPV Bhopal.
>
>
> On Sat, Jul 4, 2020 at 1:06 PM Yue-Wen Fang <yuewen.fang at gmail.com> wrote:
>
>> You can refer to Phonopy's webpage directly in which Dr. Togo has already
>> shown several examples using Phonopy+QE.
>> You were using the "finite displacement method" of supercells to get the
>> force constants, thus the supercell structures used for force calculations
>> were defined with "finite displacements", that was why you saw the
>> reduction of symmetry.
>>
>> Neelam Swarnkar <neelamswarnkar35 at gmail.com> 于2020年7月3日周五 下午5:31写道:
>>
>>> Thanks for the reply .
>>>
>>> Can anyone share a user guide or tutorial of phonopy . which has working
>>> techniques of phonopy, how to define the structure, and how to obtain
>>> required parameters.
>>>
>>> On Thu, Jul 2, 2020 at 9:08 PM Lorenzo Paulatto <paulatz at gmail.com>
>>> wrote:
>>>
>>>> > I make a supercell of dim 2 1 1 . But in the unit cell , I define a
>>>> > space group R-3c (167) rhombohedral structure , but after making the
>>>> > supercell its space group changed to C2 (5) .
>>>>
>>>> This is not just a supercell, atoms are moved to phonons via force
>>>> constants. Symmetry is reduced.
>>>>
>>>> > so it can be possible or either error .
>>>> > I don't know about phonopy , that's why I have a doubt.
>>>> > also after running the above command. There are too many
>>>> supercell001.in
>>>> > <http://supercell001.in> upto supercell072.in <http://supercell072.in
>>>> >.
>>>> > which one is correct. for further scf, nscf, relax calculation in QE.
>>>>
>>>> All of them. I.e. phonopy needs 72 calculations of forces in order to
>>>> compute all the force constants. Btw a 2x1x1 supercell is very likely
>>>> going to be too small for whatever you want to compute.
>>>>
>>>> cheers
>>>>
>>>> >
>>>> >
>>>> > pl. Suggest me.
>>>> >
>>>> > On Thu, Jul 2, 2020 at 3:16 PM Neelam Swarnkar
>>>> > <neelamswarnkar35 at gmail.com <mailto:neelamswarnkar35 at gmail.com>>
>>>> wrote:
>>>> >
>>>> >     Thanks for reply
>>>> >
>>>> >
>>>> >     On Thu, Jul 2, 2020, 12:37 PM Saibabu Madas
>>>> >     <Saibabu.Madas at eli-alps.hu <mailto:Saibabu.Madas at eli-alps.hu>>
>>>> wrote:
>>>> >
>>>> >         Dear Neelam Swarnkar,
>>>> >
>>>> >
>>>> >         I believe the space between "dim" and " =" in the phonopy
>>>> >         command is causing the error. Please try the following
>>>> command:
>>>> >
>>>> >         "phonopy --qe -d --dim="2 1 1" -c filename.in <
>>>> http://filename.in>"
>>>> >
>>>> >
>>>> >         Best regards,
>>>> >
>>>> >         *Madas Saibabu*
>>>> >
>>>> >         Early Stage Researcher
>>>> >
>>>> >
>>>> >         *ELI-HU Non-Profit Ltd.*
>>>> >
>>>> >         Computational and Applied Materials Science Group
>>>> >
>>>> >         Attosecond and Strong Field Science division
>>>> >
>>>> >         HQ: H-6728 Szeged, Wolfgang Sandner utca 3.
>>>> >
>>>> >         E-mail: Saibabu.Madas at eli-alps.hu
>>>> >         <mailto:Saibabu.Madas at eli-alps.hu>
>>>> >
>>>> >         Website: www.eli-alps.hu <http://www.eli-alps.hu>
>>>> >
>>>> >
>>>>  ------------------------------------------------------------------------
>>>> >         *From:* users <users-bounces at lists.quantum-espresso.org
>>>> >         <mailto:users-bounces at lists.quantum-espresso.org>> on behalf
>>>> of
>>>> >         Neelam Swarnkar <neelamswarnkar35 at gmail.com
>>>> >         <mailto:neelamswarnkar35 at gmail.com>>
>>>> >         *Sent:* Thursday, July 2, 2020 7:00
>>>> >         *To:* Quantum ESPRESSO users Forum
>>>> >         *Subject:* [QE-users] supercell
>>>> >         Dear expert and all
>>>> >
>>>> >         I am making a supercell of dim 2 1 1, i already installed
>>>> >         phonopy-2.6.0 version , but it is showing me an error.
>>>> >
>>>> >         this is my input file
>>>> >
>>>> >
>>>> >         &control
>>>> >              calculation = 'scf',
>>>> >              prefix = '2d_exc1',
>>>> >              outdir = './tmp/'
>>>> >              pseudo_dir = './'
>>>> >
>>>> >
>>>> >           /
>>>> >           &system
>>>> >              ibrav =  0,
>>>> >              celldm(1)= 23.1132402,
>>>> >              celldm(3)= 1.016106614,
>>>> >              nat =  12,
>>>> >              ntyp = 2,
>>>> >              ecutwfc = 27,
>>>> >              ecutrho = 136
>>>> >
>>>> >           /
>>>> >           &electrons
>>>> >              mixing_beta = 0.6
>>>> >           /
>>>> >
>>>> >           ATOMIC_SPECIES
>>>> >           Zn 60.00  Zn.pbe-dnl-kjpaw_psl.1.0.0.UPF
>>>> >           Sb 102.00 Sb.pbe-n-kjpaw_psl.1.0.0.UPF
>>>> >
>>>> >
>>>> >           ATOMIC_POSITIONS crystal
>>>> >           Zn  1.000000   0.866025    1.016107
>>>> >           Zn  1.016107   1.000000    0.866025
>>>> >           Zn  0.866025   1.016107    1.000000
>>>> >           Zn -0.366025  -0.500000   -0.516107
>>>> >           Zn -0.516107  -0.366025   -0.500000
>>>> >           Zn -0.500000  -0.516107   -0.366025
>>>> >           Sb -1.000000  -0.866025   -1.016107
>>>> >           Sb -1.016107  -1.000000   -0.866025
>>>> >           Sb -0.866025  -1.016107   -1.000000
>>>> >           Sb  0.366025   0.500000    0.516107
>>>> >           Sb  0.516107   0.366025    0.500000
>>>> >           Sb  0.500000   0.516107    0.366025
>>>> >
>>>> >
>>>> >            K_POINTS (automatic)
>>>> >
>>>> >             4 4 4 0 0 0
>>>> >
>>>> >
>>>> >           CELL_PARAMETERS angstrom
>>>> >
>>>> >         12.2309951090    0.0000000000   0.0000000000
>>>> >                  -6.1154975550   10.5923524780   0.0000000000
>>>> >            0.0000000000    0.0000000000  12.4279950260
>>>> >
>>>> >         I don't know what's wrong in my input file.
>>>> >
>>>> >
>>>> >
>>>>  ------------------------------------------------------------------------
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>>>> --
>>>> Lorenzo Paulatto - Paris
>>>> _______________________________________________
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>>
>>
>> --
>>
>> ------------------------------------------------------------------------------------------------------------
>> Yue-Wen FANG, PhD
>> Tokyo Institute of Technology, Japan
>>
>>
>>
>> _______________________________________________
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-- 
------------------------------------------------------------------------------------------------------------
Yue-Wen FANG, PhD
Tokyo Institute of Technology, Japan
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