# Different orders for a phase transition (variable depending)

1. Apr 6, 2015

### lfqm

Hi guys!
I've got this system in which Eherenfest classification of "order" is assumed to be ok.
So I took my free energy function $$G(T,P)$$ and start differentiating.
I found just one phase transition between two phases, the problem is the phase transition is of different order depending on the variable, i.e. the lowest derivative respect to T to be discontinuous is the first, but the lowest derivative respect to P to be discontinuous is the second...

So... Is this normal?, I though it didn't matter how I cross the boundary between the phases, but apparently it does.
What is the order if the transition?, first (it is the lowest)?

Thanks

2. Apr 11, 2015

### Staff: Admin

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

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