Figure 3: Pressure–temperature phase diagram of Yb2+xTi2−xO7+δ.
From: Ground state selection under pressure in the quantum pyrochlore magnet Yb2Ti2O7
The vertical axis displays the pressure P in logarithmic scale and the horizontal axis the temperature T. Empty black circles define the transition line between the collective paramagnetic (PM, orange) and the splayed ferromagnetic (SFM, blue) regions relative to the x=0 sample. The transition temperature is defined such that for T≤Tc 50% of the magnetic moments are frozen (see Fig. 2c). Error bars allow Tc to be defined between 40 and 60% of the magnetic fraction. The green region highlights the presence of a disordered, non-magnetic phase (QSL) found at P=0. Black thick line is a guide to the eye. Dashed purple line is the hypothetical transition line for x=0.046.
