Crystal Growth of High-Tc Superconductor Bi2Sr2Ca1Cu20x by Floating Zone Method

Gu, G. D.; Takamuku, K.; Nakamura, N.; Kagiya, S.; Koshizuka, N.; Tanaka, Shōji

doi:10.1007/978-4-431-68305-6_128

Cited by 2 publications

(2 citation statements)

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“…For transport measurement, four-probe electrodes were fabricated on the SC film. As seen in Figure d, the electric resistivity of our BSSCO film versus temperature exhibited a superconducting transition temperature at ∼91 K, essentially the same as that of bulk BSCCO …”

Section: Underlying Principle Of the Technique And Experimental Arran...mentioning

confidence: 97%

“…2(d), the electric resistivity of our BSSCO film versus temperature exhibited a superconducting transition temperature at ~91K, essentially the same as that of bulk BSCCO. 25 We first carried out a measurement with the BSSCO film in the normal state at 100K to find the MW magnetic field B0 sensed by the NVcenters as a reference. The observed Rabi oscillation is shown in Fig.…”

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confidence: 99%

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Mapping Dynamical Magnetic Responses of Ultrathin Micron-Size Superconducting Films Using Nitrogen-Vacancy Centers in Diamond

Hui

et al. 2019

Nano Lett.

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Two-dimensional superconductors have attracted growing interest because of their scientific novelty, structural tunability, and useful properties. Studies of their magnetic responses, however, are often hampered by difficulties to grow large-size samples of high quality and uniformity. We report here an imaging method that employed NVcenters in 2 diamond as sensor capable of mapping out the microwave magnetic field distribution on an ultrathin superconducting film of micron size. Measurements on a 33nm-thick film and a 125nm-thick bulk-like film of Bi2Sr2CaCu2O8+ revealed that the ac Meissner effect (or repulsion of ac magnetic field) set in at 78K and 91K, respectively; the latter was the superconducting transition temperature (Tc) of both films. The unusual ac magnetic response of the thin film presumably was due to thermally excited vortex-antivortex diffusive motion in the film. Spatial resolution of our ac magnetometer was limited by optical diffraction and the noise level was at 14 T/Hz 1/2 . The technique could be extended with better detection sensitivity to extract local ac conductivity/susceptibility of ultrathin or monolayer superconducting samples as well as ac magnetic responses of other two-dimensional exotic thin films of limited lateral size.

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Section: Underlying Principle Of the Technique And Experimental Arran...mentioning

confidence: 97%

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confidence: 99%