Steady-State, ac-Temperature Calorimetry

Sullivan, Paul F.; Seidel, G. M.

doi:10.1103/physrev.173.679

Cited by 725 publications

(320 citation statements)

References 5 publications

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“…We mounted a sample inside a glove box with an Ar atmosphere. We measured the specific heat by using the a.c. method 27 : we applied an a.c. current to the heater using a current source (6221, Keithley Instruments), and measured the resultant temperature modulation amplitude T ac and the phase shift φ ac using lock-in amplifiers (SR830, Stanford Research Systems). The offset sample temperature T was also recorded by another lock-in amplifier.…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic evidence for nematic superconductivity in CuxBi2Se3

et al. 2016

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In condensed matter physics, spontaneous symmetry breaking has been a key concept, and discoveries of new types of broken symmetries have greatly increased our understanding of matter 1,2 . Recently, electronic nematicity, novel spontaneous rotational-symmetry breaking leading to an emergence of a special direction in electron liquids, has been attracting significant attention 3-6 . Here, we show bulk thermodynamic evidence for nematic superconductivity, in which the nematicity emerges in the superconducting gap amplitude, in Cu x Bi 2 Se 3 . Based on high-resolution calorimetry of single-crystalline samples under accurate two-axis control of the magnetic field direction, we discovered clear two-fold symmetry in the specific heat and in the upper critical field despite the trigonal symmetry of the lattice. Nematic superconductivity for this material should possess a unique topological nature associated with odd parity 7-9 . Thus, our findings establish a new class of spontaneously symmetry-broken states of matter-namely, odd-parity nematic superconductivity.

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Section: Methodsmentioning

confidence: 99%

Thermodynamic evidence for nematic superconductivity in CuxBi2Se3

et al. 2016

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“…A sample platform with a deposited thin-film heater is suspended by a thermopile made of 24 thermocouples acting as a strong heat link to the surrounding thermal bath. The specific heat can be obtained using an ac technique 21 which provides a high sensitivity and density of data points, or with a less sensitive dc heat-flow technique. 22 The latter is helpful to calibrate absolute values and to rule out artifacts due to the ac method.…”

Section: Methodsmentioning

confidence: 99%

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

et al. 2006

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The range of critical thermal fluctuations in "classical" bulk superconductors is extremely small and especially in low fields hardly experimentally accessible. With a new type of calorimeter we have been able to resolve a small lambda anomaly within a narrow temperature range around the H c2 line. We show that the evolution of the anomaly as a function of magnetic field follows scaling laws expected in the presence of critical fluctuations. The lower onset of the fluctuation regime shows many characteristics of a continuous solid-to-liquid transition in the vortex matter. It can be driven into a first-order vortex melting transition by a small ac field which helps the vortex matter to reach equilibrium.

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“…The ac microcalorimeter [8] which uses a diode as the heater has been used. An optical fiber is used to drive the heating power onto the sample.…”

Section: Methodsmentioning

confidence: 99%

Superconducting energy gap in MgCNi3 single crystals

Kačmarčı́k

Szabó

Samuely

et al. 2008

Journal of Physics and Chemistry of Solids

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Even though MgCNi 3 contains large molar volume of magnetic Ni atoms it clearly shows superconductivity. The origin of superconductivity in this material has not yet been clarified. There is a lot of discrepancy in experimental results and physical interpretation where even unconventional pairing or a two-band model have been proposed for the system. All that is based on results obtained on polycrystalline samples. Here we present the first point-contact spectroscopy and ac-calorimetry measurements on the MgCNi 3 single crystals of very good quality.Measurements have been performed in the temperature range from 1.5 to 10 K and in magnetic fields up to 8 T. The temperature dependence of the energy gap of the system is presented and compared to the BCS model. A c c e p t e d m a n u s c r i p t

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Steady-State, ac-Temperature Calorimetry

Cited by 725 publications

References 5 publications

Thermodynamic evidence for nematic superconductivity in CuxBi2Se3

Thermodynamic evidence for nematic superconductivity in CuxBi2Se3

Thermal fluctuations and vortex melting in theNb3Snsuperconductor from high resolution specific heat measurements

Superconducting energy gap in MgCNi3 single crystals

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