High-pressure heat capacity of chromiumnear the néel line

Bonilla, Alex; Garland, C. W.

doi:10.1016/s0022-3697(74)80269-6

Cited by 17 publications

(10 citation statements)

References 25 publications

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“…6 for a reproduction of these data). The magnetic entropy, S, extracted from measurements of the specific heat was found to be almost constant at T > T N with S = 17 J/(mol·K), i.e., close to the expected value of R ln (8). This result is fully consistent with the absence of crystal-field effects in this compound.…”

Section: Antiferromagnetic Transition In the Rare-earth Compound Gdnisupporting

confidence: 76%

“…7 (b)). Our estimate of the magnetic entropy yields S ∼ 15.7 J/mol/K at T = T N which corresponds to 90% of the expected S = R ln (8). Even if this analysis can only provide a rough estimate of the entropy due to the uncertainties involved in the determination of the non-magnetic contributions, it confirms that we can determine not only specific heat, but also entropies on the same semi-quantitative level.…”

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confidence: 62%

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Use of Cernox thermometers in AC specific heat measurements under pressure

Gati

Drachuck

et al. 2019

Review of Scientific Instruments

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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 GdNiGe 3 (T N = 26 K) and (iii) the structural/magnetic transition in the ironpnictide BaFe 2 As 2 (T s,N = 130 K). The chosen examples demonstrate the versatility of our technique for measuring the specific heat under pressure of various condensedmatter systems with very different transition temperatures as well as amounts of removed entropy. 1 arXiv:1901.05089v2 [cond-mat.mtrl-sci]

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Section: Antiferromagnetic Transition In the Rare-earth Compound Gdnisupporting

confidence: 76%

supporting

confidence: 62%

Use of Cernox thermometers in AC specific heat measurements under pressure

Gati

Drachuck

et al. 2019

Review of Scientific Instruments

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“…In this regard, the technique of ac calorimetry has proven to be particularly suited. [110][111][112][113][114][115][116][117] Here, the sample is heated by an oscillatory heat source and the resulting temperature oscillation contains information on the specific heat of the sample (Figure 2a). The main advantage for the use of this technique in the pressure cell is related to the choice of the heating frequency.…”

Section: Measurement Probes Under Hydrostatic Pressurementioning

confidence: 99%

“…As a result, to a first approximation, the sample is effectively decoupled from the bath, which in principle allow the extraction of absolute values of the specific heat on a semiquantitative level. [110] Although ac calorimetry measurements under pressure have a long-standing history in the community, [110][111][112][113][114][115][116][117] its use was typically restricted to narrow temperature ranges due to reasons related to the sensitivity of the thermometers used. In our efforts to determine the phase diagram of iron-based superconductors under hydrostatic pressure, which typically undergo a cascade of phase transitions over wide temperature ranges, we recently reported on an optimization of the thermometry of such an ac calorimetry setup to measure specific heat over wide temperature ranges in conventional piston-pressure cells up to 2.5 GPa ( Figure 2).…”

Section: Measurement Probes Under Hydrostatic Pressurementioning

confidence: 99%

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to as nematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). Efforts to probe the phase diagrams of pressure-tuned iron-based superconductors are reviewed with a strong focus on recent insights into the phase diagrams of several members of this material class under hydrostatic pressure. These studies on FeSe, Ba(Fe 1−x Co x) 2 As 2 , Ca(Fe 1−x Co x) 2 As 2 , and CaK(Fe 1−x Ni x) 4 As 4 are, to a significant extent, made possible by advances of what measurements can be adapted to their use under differing pressure environments. The potential impact of these tools for the study of the wider class of strongly correlated electron systems is pointed out.

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“…The possibility of tuning both the amplitude and the frequency of the excitation is the main advantage of this method; as long as κ can be made small enough, the sensitivity of the measurement does not depend on the mass of the sample. This technique was employed by several groups [2,3,4,5] to investigate the pressure dependence of the specific heat. The conditions for the ac-technique in a pressure cell are far away from being ideal.…”

mentioning

confidence: 99%

AC-Calorimetry at High Pressure and Low Temperature

Wilhelm

2003

Advances in Solid State Physics

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Recent developments of the AC-calorimetric technique adapted for the needs of high pressure experiments are discussed. A semi-quantitative measurement of the specific heat with a Bridgman-type of pressure cell as well as a diamond anvil cell is possible in the temperature range 0.1 K < T < 10 K. The pressure transmitting medium used to ensure good pressure conditions determines to a great extent via its thermal conductivity the operating frequency and thus the accessible temperature range. Investigations with different pressure transmitting media for T > 1.5 K reveal for solid He a cut-off frequency which is considerably higher than for steatite. Experiments below 1 K and pressures above 10 GPa clearly show that the pressure dependence of the linear temperature coefficient of the specific heat can be measured. It is in qualitative agreement to a related quantity obtained quasi-simultaneously by electrical resistivity measurements on the same sample.Comment: 14 pages, 7 figures. The manuscript with high resoultion figures (pdf-file, about 1Mb) can be downloaded from http://www.cpfs.mpg.de/~wilhelm

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High-pressure heat capacity of chromiumnear the néel line

Cited by 17 publications

References 25 publications

Use of Cernox thermometers in AC specific heat measurements under pressure

Use of Cernox thermometers in AC specific heat measurements under pressure

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

AC-Calorimetry at High Pressure and Low Temperature

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