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Lortz, Rolf; Meingast, C.; Welp, U.; Kwok, W. K.; Crabtree, G. W.

doi:10.1103/physrevlett.90.237002

Cited by 11 publications

(12 citation statements)

References 35 publications

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“…and no melting anomaly could be detected below ≈ 3 K [see Fig. 3(c)] where only a broadened mean-field feature persists which in turn vanishes for T 0.7 K. Additional evidence for the existence of an underlying vortex-melting transition is obtained from thermal-expansion measurements, which have proven to be a very sensitive and complimentary probe of the vortex matter [27,30]. As shown in the heating curves (after field cooling) of Figs.…”

Section: (D) and 3(c)]mentioning

confidence: 99%

“…Unequivocal thermodynamic evidence of a genuine vortexlattice melting transition finally came out soon after the discovery of the cuprate superconductors, in which thermal fluctuations are greatly enhanced due to their high-T c , very short coherence length and large anisotropy. In a very limited number of exceptionally high-quality single crystals, vortex melting manifests as a tiny discontinuity in the reversible magnetization [15][16][17][18], while heat-capacity [19][20][21][22][23][24][25][26] and thermalexpansion [27] measurements exhibit a peak superimposed on a step indicative of the additional degrees of freedom in the high-temperature vortex-liquid phase. This first-order transition represents the only genuine phase transition for superconductivity in a magnetic field, since H c2 (T ) becomes a broad crossover.…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

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Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe

Hardy

Doussoulin

Klein

et al. 2020

Phys. Rev. Research

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Section: (D) and 3(c)]mentioning

confidence: 99%

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe

Hardy

Doussoulin

Klein

et al. 2020

Phys. Rev. Research

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“…These estimates yield for the universal ratios the values (23)). Recently it was shown that the melting line depends on pressure [50]. The underlying coupling between the vortex transition and the crystal lattice then demonstrates that the crystal lattice is more than a mere host for the vortices.…”

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confidence: 99%

Magnetic field induced 3D–1D crossover in type-II superconductors

Schneider

2008

J. Phys.: Condens. Matter

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Abstract. We review and analyze magnetization and specific heat investigations on type-II superconductors which uncover remarkable evidence for the magnetic field induced finite size effect and the associated 3D to 1D crossover which enhances thermal fluctuations. Indeed, the correlation length transverse to the magnetic field H i , applied along the i-axis, cannot grow beyond the limiting magnetic length1/2 , related to the average distance between vortex lines. Noting that 1D is incompatible with the occurrence of a continuous phase transition at finite temperatures, the mean-field transition line H C2 (T ) is replaced by the 3D to 1D crossover line Hp (T ). Since the magnetic field induced finite size effect relies on thermal fluctuations and there enhancement originating from the 3D to 1D crossover, its observability is not be restricted to type-II superconductors with small correlation volume only, including YBa 2 Cu 4 O 8 , NdBa 2 Cu 3 O 7−δ , YBa 2 Cu 3 O 7−δ , and DyBa 2 Cu 3 O 7−δ , where 3D-xy critical behavior was already observed in zero field. Indeed, our analysis of the reversible magnetization of RbOs 2 O 6 and the specific heat of Nb 77 Zr 23 , Nb 3 Sn and NbSe 2 reveals that even in these low Tc superconductors with comparatively large correlation volume the 3D to 1D crossover is observable in sufficiently high magnetic fields. Consequently, below Tc and above H pi (T ) superconductivity is confined to cylinders with diameter L H i (1D) and there is no continuous phase transition in the (H, T ) -plane along the H c2 (T ) -line as predicted by the mean-field treatment. Moreover we observe that the thermodynamic vortex melting transition occurs in the 3D regime. While in YBa 2 Cu 4 O 8 , NdBa 2 Cu 3 O 7−δ , YBa 2 Cu 3 O 7−δ , and DyBa 2 Cu 3 O 7−δ it turns out to be driven by 3D-xy thermal fluctuations, the specific heat data of the conventional type-II superconductors Nb 77 Zr 23 , Nb 3 Sn and NbSe 2 point to Gaussian fluctuations. Because the vortex melting and the 3D-1D crossover line occur at universal values of the scaling variable their relationship is universal.

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“…1 In particular, studying the change in thermal expansion across a phase transition has become one of the important techniques in condensed matter physics since it can reflect the intrinsic change of the electronic system with very high resolution. [2][3][4][5][6] In the case of studying superconductors, the thermal-expansion measurement can detect phase transitions and vortex dynamics within the superconducting state, [7][8][9][10] which shows its unique advantages compared to resistivity and magnetic-susceptibility measurements. The ratio between the thermal expansion and the specific heat gives the Grüneisen parameter, which is a crucial thermodynamical parameter for studying quantum critical transitions.…”

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confidence: 99%

A temperature-modulated dilatometer by using a piezobender-based device

Liu

Hong

et al. 2020

Review of Scientific Instruments

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We report a new design of a temperature-modulated dilatometer, which obtains the linear thermal expansion coefficient by measuring the oscillating changes of the sample's length and temperature by using a piezobender and a thermocouple, respectively. Using an iron-based superconductor KFe 2 As 2 as an example, we show that this device is able to measure thin samples with high resolutions at low temperatures and high magnetic fields. Despite its incapability of giving absolute values, the new dilatometer provides a high-resolution method to study many important physical properties in condensed matter physics, such as thermal and quantum phase transitions and vortex dynamics in the superconducting state. The prototype design of this device can be further improved in many aspects to meet particular requirements.

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Crystal-Lattice Coupling to the Vortex-Melting Transition inYBa2Cu3O

Cited by 11 publications

References 35 publications

Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe

Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe

Magnetic field induced 3D–1D crossover in type-II superconductors

A temperature-modulated dilatometer by using a piezobender-based device

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