Calorimetric Study of the Transitions Between the Different Vortex States in YBa2Cu3O7

Bouquet, F.; Marcenat, C.; Calemczuk, R.; Erb, A.; Junod, A.; Roulin, Marlyse; Welp, U.; Kwok, W. K.; Crabtree, G. W.; Phillips, N. E.; Fisher, Robert A.; Schilling, Andreas

doi:10.1007/978-94-011-4558-9_40

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…1 and the above discussion about T K in the vortex matter in HTSCs. With the introduction of random vortex pinning defects, however, the first-order melting transition vanishes and is replaced by a more continuous transition 4,[11][12][13][14] , commonly referred to as the 'vortex-glass' transition. There is evidence for different glassy phases (Bose glass, Bragg Glass and vortex glass) 4 , the detailed nature of which however remains controversial.…”

Section: Motivationmentioning

confidence: 99%

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

et al. 2007

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Using high-resolution thermal expansion and magnetization measurements, we provide experimental evidence for a kinetic glass transition in the vortex matter of YBa 2 Cu 3 O 7-δ with some disorder. This transition, which represents the true superconducting transition in a magnetic field, exhibits many of the features of the usual glass transition found in supercooled structural liquids such as window glass. We demonstrate, using both kinetic and thermodynamic criteria, that this vortex matter is the most fragile system known to date, which we argue makes it possible to investigate the behavior very close to the Kauzmann temperature. Vortex matter, we suggest, may be a model system to study glassy behavior in general, which is expected to lead to a better understanding of the strong-fragile behavior in structural glasses.

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Section: Motivationmentioning

confidence: 99%

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

et al. 2007

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“…At the other end, high fields tend to decouple the CuO superconducting planes, making them more susceptible to disorder, so that the periodicity is again easily broken. Oxygen vacancies give an example of a source of such short-range disorder; accordingly, fully oxygenated Y-123 and Dy-123 crystals have shown immeasurably high values of B up cr [15,35]. Only at intermediate fields can the interaction with pinning centres be neglected.…”

Section: Phase Diagrammentioning

confidence: 99%

Reversible and irreversible magnetocaloric effect in the NdBa₂Cu₃O₇superconductor in relation to specific heat and magnetization

Plackowski¹,

Wang²,

Lortz³

et al. 2005

J. Phys.: Condens. Matter

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A recently developed technique for measuring the isothermal magnetocaloric coefficient (M T ) is applied to the study of a superconducting NdBa 2 Cu 3 O 7 single crystal. Results are compared with magnetization (M) and specific heat (C). In the reversible region both C and M T follow the scaling law of the 3D-xy universality class. The anomalies connected with flux-line lattice melting are visible on M T (B) curves as peaks and steps, similar to C(T) curves yet with much smaller background. At lower temperature, in the irreversible region the M T (B) behaviour resembles more that of M(B), exhibiting the "fishtail" effect. Our results confirm that the peculiarities of the phase diagram known from the high temperature superconductor YBa 2 Cu 3 O 7 , e.g. vortex melting, dominance of critical fluctuations and absence of a B c2 critical field line, are a common property of RE-123 systems.

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“…The height of its peak is very sensitive to any distribution of T C . Moreover, ac-calorimetry is not the proper tool to measure a latent heat [15,16,17,18], since it only detects the reversible part at frequency ω on a temperature scale T ac . The apparent latent heat may be smaller if part of the system is irreversible at the given frequency.…”

Section: A Testingmentioning

confidence: 99%

“…The apparent latent heat may be smaller if part of the system is irreversible at the given frequency. The size of the peak can depend strongly on the operating conditions [18]. This explains the different behaviour at T C since the relaxation technique used at zero pressure [9,14] is not subject to this restriction.…”

Section: A Testingmentioning

confidence: 99%

Calorimetric investigation of CeRu2Ge2 up to 8 GPa

Bouquet

Wang

Wilhelm

et al. 2000

Solid State Communications

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We have developed a calorimeter able to give a qualitative picture of the specific heat of a sample under high pressure up to ≈ 10 GPa. The principle of ac-calorimetry was adapted to the conditions in a high pressure clamp. The performance of this technique was successfully tested with the measurement of the specific heat of CeRu2Ge2 in the temperature range 1.5 K < T < 12 K. The phase diagram of its magnetic phases is consistent with previous transport measurements.

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Calorimetric Study of the Transitions Between the Different Vortex States in YBa2Cu3O7

Cited by 7 publications

References 32 publications

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

Reversible and irreversible magnetocaloric effect in the NdBa₂Cu₃O₇superconductor in relation to specific heat and magnetization

Calorimetric investigation of CeRu2Ge2 up to 8 GPa

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Calorimetric Study of the Transitions Between the Different Vortex States in YBa2Cu3O7

Cited by 7 publications

References 32 publications

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

‘Fragile Superconductivity’: A Kinetic Glass Transition in the Vortex Matter of the High-temperature Superconductor YBa2 Cu3O7-δ

Reversible and irreversible magnetocaloric effect in the NdBa2Cu3O7superconductor in relation to specific heat and magnetization

Calorimetric investigation of CeRu2Ge2 up to 8 GPa

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Product

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Reversible and irreversible magnetocaloric effect in the NdBa₂Cu₃O₇superconductor in relation to specific heat and magnetization