Figure 4: Differential heat capacity measurement in La1.675Eu0.2Sr0.125CuO4. | Nature Communications

Figure 4: Differential heat capacity measurement in La1.675Eu0.2Sr0.125CuO4.

From: Unconventional charge order in a co-doped high-Tc superconductor

Figure 4

Two features can be discerned—the orthorhombic-tetragonal structural transition at TLTT130 K and a signature of the intermediate phase at TEN. The latter is strong evidence that a true thermodynamic phase transition takes place close to TEN. Inset shows a comparison between the quadrupolar correlation function |σ3|(kT)3 (circles; error bars are s.d. from measurements at different electric fields) and ΔCp (small circles) for temperatures in the vicinity of TEN. The ΔCp measurement in the inset is performed 10 times slower than in the main graph, enhancing the sharpness of the cusp at TEN. The solid line is a fit to a logarithmic divergence ln|(TTEN)/TEN|, showing that no simple power law (scaling) relation can describe the data.

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