[Wien] (no subject)

[Malgorzata Bukala]

Thanks a lot for your explanation.
Margo

----- Original Message ----- 
From: "Parker, David S." <parkerds at ornl.gov>
To: "'A Mailing list for WIEN2k users'" <wien at zeus.theochem.tuwien.ac.at>
Sent: Thursday, October 06, 2011 7:14 PM
Subject: Re: [Wien] (no subject)


> Margo, no one knows - it is a function of temperature and doping and will 
> in general be material specific.  The virtue of using Boltztrap
> Is that one can compute the thermopower without needing to know the value. 
> You can make an estimate if you have published values of the mobility for 
> the material at hand, but in general estimating the relaxation time from 
> first principles is a hard problem. - David
> -----Original Message-----
> From: wien-bounces at zeus.theochem.tuwien.ac.at 
> [mailto:wien-bounces at zeus.theochem.tuwien.ac.at] On Behalf Of Malgorzata 
> Bukala
> Sent: Thursday, October 06, 2011 10:32 AM
> To: wien at zeus.theochem.tuwien.ac.at
> Subject: [Wien] (no subject)
>
> Dear users of  Wien2k,
>
> I have a question about BoltzTraP code.
> In this program to simplify the Boltzmann equation the relaxation time 
> approximation is adopted and relaxation time is kept constant. But what is 
> the value of this parameter?
>
> Margo
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