Coulomb blockade thermometry based nanocalorimetry

Abstract

Specific heat is a powerful probe offering insights into the entropy and excitation spectrum of the studied material. While it is well established, a key challenge remains the measurements of microcrystals or thin films especially in the sub-Kelvin, high magnetic field regime. Here we present a setup combining the high sensitivity of SiN${}_x$ membrane based calorimetry with the absolute accuracy of Coulomb blockade thermometry to realise a nanocalorimeter for such tasks. The magnetic field independent technique of Coulomb blockade thermometry provides an on-platform thermometer combining a primary thermometry mode for in-situ calibration with a fast secondary mode suitable for specific heat measurements. The setup is validated using measurements of a 20 $\mu$g sample of Sr${}_3$Ru${}_2$O${}_7$ achieving a resolution on the order of 0.1 nJ/K at 500 mK and an absolute accuracy limited by the determination of the sample's mass. Measurements of CeRh${}_2$As${}_2$ further highlight the benefits of measuring microcrystals with such a device.

References in corpus (21)

• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Field-induced transition from even to odd parity superconductivity in CeRh${}_2$As${}_2$
• Field tunable spin density wave phases in Sr3Ru2O7
• Quantum oscillations near the metamagnetic transition in Sr3Ru2O7
• Quantum-Matter Heterostructures
• Sr3Ru2O7: Thermodynamics of Phase Formation in a Quantum Critical Metal
• Possible quadrupole density wave in the superconducting Kondo lattice CeRh2As2
• Membrane-based nanocalorimeter for high-resolution measurements of low-temperature specific heat
• 500 microkelvin nanoelectronics
• Decoupling multi-phase superconductivity from normal state ordering in CeRh${}_2$As${}_2$
• Accurate Coulomb Blockade Thermometry up to 60 Kelvin
• Primary thermometry in the intermediate Coulomb blockade regime
• LongHCPulse: Long Pulse Heat Capacity on a Quantum Design PPMS
• Coulomb blockade in one-dimensional arrays of high conductance tunnel junctions
• Study of the electronic nematic phase of Sr${}_3$Ru${}_2$O${}_7$ with precise control of the applied magnetic field vector
• Encapsulated Single Crystal Growth and Annealing of the High-Temperature Superconductor Tl-2201
• Absolute accuracy in membrane-based ac nanocalorimetry
• Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh${}_2$As${}_2$ revealed by $\mu$SR studies
• Low temperature thermodynamic investigation of the phase diagram of Sr${}_3$Ru${}_2$O${}_7$
• The de Haas van Alphen effect near a quantum critical end point in Sr_3Ru_2O_7
• Wide Range Thin-FIlm Ceramic Metal-Alloy Thermometers with Low Magnetoresistance