Local transport properties of PrFeAsO0.7 using FIB micro-fabrication technique

Shirai, K.; Kashiwaya, Hiromi; Miura, Shinichi; Ishikado, M.; Eisaki, H.; Iyo, A.; Kurosawa, I.; Kashiwaya, Satoshi

doi:10.1016/j.physc.2010.05.141

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…[7] Details of the crystal growth condition and the device fabrication process have been described elsewhere. [3,4,5,8] It should be noted that one of the essential advantages of the present device is that the influence of surface or interface degradation can be completely eliminated, because the present junction does not rely on the hetero-structure. In addition, junction size of a few micrometers is small enough to exclude the unanticipated presence of grain boundaries inside the junction.…”

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confidence: 99%

C -axis critical current of a PrFeAsO0.7 single crystal

Kashiwaya

Shirai

Matsumoto

et al. 2010

Applied Physics Letters

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The c-axis transport properties of a high-pressure synthesized PrFeAsO0.7 single crystal are studied using s-shaped junctions. Resistivity anisotropy of about 120 detected at 50 K shows the presence of strong anisotropy in the electronic states. The obtained critical current density for the c-axis of 2.9*10^5 A/cm^2 is two orders of magnitude larger than that in Bi2Sr1.6La0.4CuO6+d. The appearance of a hysteresis in the current-voltage curve below T_c is the manifestation of the intrinsic Josephson effect similar to that in cuprate superconductors. The suppression of the critical current-normal resistance (I_cR_n) product is explained by an inspecular transport in s_pm-wave pair potential.Comment: 8 pages, 2 figure

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confidence: 99%

C -axis critical current of a PrFeAsO0.7 single crystal

Kashiwaya

Shirai

Matsumoto

et al. 2010

Applied Physics Letters

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“…According to Ref. 13 14,18 an anisotropy mismatch has not been clearly detected. Previous calculations of the viscous drag tensor accounted for the anisotropy mismatch only on the basis of a simplified model of a steplike order-parameter profile within the vortex core.…”

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confidence: 95%

Mismatch of conductivity anisotropy in the mixed and normal states of type-II superconductors

Bespalov

Mel’nikov

2012

Phys. Rev. B

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We have calculated the Bardeen-Stephen contribution to the vortex viscosity for uniaxial anisotropic superconductors within the time-dependent Ginzburg-Landau (TDGL) theory. We focus our attention on superconductors with a mismatch of anisotropy of normal and superconducting characteristics. Exact asymptotics for the Bardeen-Stephen contribution have been derived in two limits: (i) l Eab ξ ab , l Ec ξ c and (ii) l Ec ξ c , l Eab ξ ab , where l Eab , l Ec and ξ ab , ξ c are the electric field penetration lengths and the coherence lengths in the ab plane and in the direction of the c axis. Also, we suggest a variational procedure which allows us to calculate the vortex viscosity for superconductors with arbitrary parameters ξ and l E . The approximate analytical result is compared with numerical calculations. Finally, using a generalized TDGL theory, we prove that the viscosity anisotropy and, thus, the flux-flow conductivity anisotropy may depend on temperature.

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Focused Ion Beam Microstructuring of Quantum Matter

Moll

2018

Annu. Rev. Condens. Matter Phys.

105

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Focused ion beam (FIB) machining promises exciting new possibilities for the study of quantum materials through precise control over the shape and geometry of single crystals on the submicrometer scale. It offers viable routes to fabricate high-quality mesoscale structures from materials that cannot yet be grown in thin-film form and to enhance the experimentally accessible signatures of new physical phenomena. Prototype devices can also be produced in a silicon-chip environment to investigate directly the materials application potential for future electronics. This review introduces the concepts of ion beam shaping of matter, discusses the role and extent of surface damage and material disorder inherent to these techniques, and gives an overview of recent experiments on FIB-structured crystals. Given the early stage of the field of FIB-fabricated quantum materials, much is yet to come, and emergent trends and future directions are also discussed.

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Local transport properties of PrFeAsO0.7 using FIB micro-fabrication technique

Cited by 3 publications

References 16 publications

C -axis critical current of a PrFeAsO0.7 single crystal

C -axis critical current of a PrFeAsO0.7 single crystal

Mismatch of conductivity anisotropy in the mixed and normal states of type-II superconductors

Focused Ion Beam Microstructuring of Quantum Matter

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