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1

It turns out that what I am seeing is a finite-size effect. To check this, I calculated the specific heat of the 2d Ising model with open boundary conditions on one side and periodic b.c. on another, using the same system sizes of $L=7$ to $L=12$, and the value $\alpha / \nu$ was found to be $\approx 2.4$. For the 2d Ising model, the value is supposed to be ...

1

Hmm, you're right. High-quality phase diagrams don't seem to float around for free on the web. I suppose I shouldn't be as surprised by this as I am. Reading from this random page it looks like at 6 atm the boiling point for nitrogen is around 85 K. Oxygen is a little harder to find, since there has been news in the past few years about metallic and ...

3

Naively, both temperatures (Curie and Curie-Weiss temperature) are equal and they're the constant temperature $T_c$ entering the Curie-Weiss Law: $$\chi = \frac{C}{T-T_c}.$$ However, the behavior is often more complicated and the formula above doesn't describe the susceptibility $\chi$ well for all temperatures. When it's so, the Curie temperature $T_c$ is ...

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