Use of Cernox thermometers in AC specific heat measurements under pressure

Abstract

We report on the resistance behavior of bare-chip Cernox thermometers under pressures up to 2 GPa, generated in a piston-cylinder pressure cell. Our results clearly show that Cernox thermometers, frequently used in low-temperature experiments due to their high sensitivity, remain highly sensitive even under applied pressure. We show that these thermometers are therefore ideally suited for measurements of heat capacity under pressure utilizing an ac oscillation technique up to at least 150 K. Our Cernox-based system is very accurate in determining changes of the specific heat as a function of pressure as demonstrated by measurements of the heat capacity on three different test cases: (i) the superconducting transition in elemental Pb (T_{c} = 7.2 K), (ii) the antiferromagnetic transition in the rare-earth compound GdNiGe3 (T_{N} = 26 K) and (iii) the structural/magnetic transition in the iron-pnictide BaFe2As2 (T_{s,N} = 130 K). The chosen examples demonstrate the versatility of our technique for measuring the specific heat under pressure of various condensed matter systems with very different transition temperatures as well as amounts of removed entropy.

arXiv comment25 pages, 8 figures

References in corpus (11)

• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Metallic Quantum Ferromagnets
• Complete pressure dependent phase diagrams for SrFe2As2 and BaFe2As2
• Combined effects of pressure and Ru substitution on BaFe2As2
• High Pressure Effects on Superconductivity
• Calorimetric Investigation of CeRu2Ge2 up to 8 GPa
• Thermodynamic and transport properties of single crystalline RCo${}_2$Ge${}_2$ (R = Y, La-Nd, Sm-Tm)
• AC-Calorimetry at High Pressure and Low Temperature

Cited by in corpus (12)

• Multiple ferromagnetic transitions and structural distortion in the van-der-Waals ferromagnet VI${}_3$ at ambient and finite pressures
• Pressure-induced ferromagnetism in the topological semimetal EuCd${}_2$As${}_2$
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe${}_3$
• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
• Magnetic order in van der Waals antiferromagnet CrPS4: anisotropic H-T phase diagrams and effects of pressure
• Avoided ferromagnetic quantum critical point in pressurized La${}_5$Co${}_2$Ge${}_3$
• Three-wall piston-cylinder type pressure cell for muon-spin rotation/relaxation experiments
• Role of Fermi surface for the pressure-tuned nematic transition in the BaFe${}_2$As${}_2$ family
• Hydrostatic pressure effect on Co-based honeycomb magnet BaCo2(AsO4)2
• Physical properties of $R$Bi${}_2$ ($R=$La, Ce) under pressure
• Interplay of structure and magnetism in LuFe4Ge2 tuned by hydrostatic pressure