Dataset Information

Growth of high-quality Bi₂Sr₂ CaCu₂O_8+δ whiskers and electrical properties of resulting exfoliated flakes.

ABSTRACT: In this work, we demonstrate a simple technique to grow high-quality whiskers of Bi₂ Sr₂ CaCu₂ O_8+δ - a high T _c superconductor. Structural analysis shows the single-crystalline nature of the grown whiskers. To probe electrical properties, we exfoliate these whiskers into thin flakes (~50 nm thick) using the scotch-tape technique and develop a process to realize good electrical contacts. We observe a superconducting critical temperature, T _c , of 86 K. We map the evolution of the critical current as a function of temperature. With 2-D materials emerging as an exciting platform to study low-dimensional physics, our work paves the way for future studies on two-dimensional high-T _c superconductivity.

SUBMITTER: Jindal A

PROVIDER: S-EPMC5468279 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Publications

Growth of high-quality Bi2Sr2 CaCu2O8+δ whiskers and electrical properties of resulting exfoliated flakes.

Jindal Apoorv A Jangade Digambar A DA Kumar Nikhil N Vaidya Jaykumar J Das Ipsita I Bapat Rudheer R Parmar Jayesh J Chalke Bhagyashree A BA Thamizhavel Arumugam A Deshmukh Mandar M MM

Scientific reports 20170612 1

In this work, we demonstrate a simple technique to grow high-quality whiskers of Bi2 Sr2 CaCu2 O8+δ - a high T c superconductor. Structural analysis shows the single-crystalline nature of the grown whiskers. To probe electrical properties, we exfoliate these whiskers into thin flakes (~50 nm thick) using the scotch-tape technique and develop a process to realize good electrical contacts. We observe a superconducting critical temperature, T < ...[more]

PMID: 28607423

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Project description:Superconducting phase transitions in two dimensions lie beyond the description of the Ginzburg-Landau symmetry-breaking paradigm for three-dimensional superconductors. They are Berezinskii-Kosterlitz-Thouless (BKT) transitions of paired-electron condensate driven by the unbinding of topological excitations, i.e. vortices. The recently discovered monolayers of layered high-transition-temperature ([Formula: see text]) cuprate superconductor Bi2Sr2CaCu2O8+δ (Bi2212) meant that this 2D superconductor promised to be ideal for the study of unconventional superconductivity. But inhomogeneity posed challenges for distinguishing BKT physics from charge correlations in this material. Here, we utilize the phase sensitivity of scanning superconducting quantum interference device microscopy susceptometry to image the local magnetic response of underdoped Bi2212 from the monolayer to the bulk throughout its phase transition. The monolayer segregates into domains with independent phases at elevated temperatures below [Formula: see text]. Within a single domain, we find that the susceptibility oscillates with flux between diamagnetism and paramagnetism in a Fraunhofer-like pattern up to [Formula: see text]. The finite modulation period, as well as the broadening of the peaks when approaching [Formula: see text] from below, suggests well-defined vortices that are increasingly screened by the dissociation of vortex-antivortex plasma through a BKT transition. In the multilayers, the susceptibility oscillation differs in a small temperature regime below [Formula: see text], consistent with a dimensional crossover led by interlayer coupling. Serving as strong evidence for BKT transition in the bulk, we observe a sharp jump in phase stiffness and paramagnetism at small fields just below [Formula: see text]. These results unify the superconducting phase transitions from the monolayer to the bulk underdoped Bi2212, and can be collectively referred to as the BKT transition with interlayer coupling.

Dataset Information

Growth of high-quality Bi₂Sr₂ CaCu₂O_8+δ whiskers and electrical properties of resulting exfoliated flakes.

Publications

Growth of high-quality Bi<sub>2</sub>Sr<sub>2</sub> CaCu<sub>2</sub>O<sub>8+δ</sub> whiskers and electrical properties of resulting exfoliated flakes.

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