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We report on the resistance behavior of bare-chip Cernox thermometers underpressures up to 2 GPa, generated in a piston-cylinder pressure cell. Ourresults clearly show that Cernox thermometers, frequently used inlow-temperature experiments due to their high sensitivity, remain highlysensitive even under applied pressure. We show that these thermometers aretherefore ideally suited for measurements of heat capacity under pressureutilizing an ac oscillation technique up to at least 150 K. Our Cernox-basedsystem is very accurate in determining changes of the specific heat as afunction of pressure as demonstrated by measurements of the heat capacity onthree different test cases: (i) the superconducting transition in elemental Pb(T_{c} = 7.2 K), (ii) the antiferromagnetic transition in the rare-earthcompound GdNiGe3 (T_{N} = 26 K) and (iii) the structural/magnetic transition inthe iron-pnictide BaFe2As2 (T_{s,N} = 130 K). The chosen examples demonstratethe versatility of our technique for measuring the specific heat under pressureof various condensed matter systems with very different transition temperaturesas well as amounts of removed entropy.

Use of Cernox thermometers in AC specific heat measurements under pressure