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Shockwave-Loading-Induced Enhancement of T _c in Superconducting Bi₂Sr₂CaCu₂O_8+?.

ABSTRACT: We report a shockwave method for altering the properties of the superconductor material Bi₂Sr₂CaCu₂O_8+? (Bi2212). We find that the superconducting transition temperature (T _c) increases from 84?K for the pristine sample to 94?K for the sample treated at a temperature and pressure of ~1200?K and ~31?GPa, respectively. X-ray diffraction and transmission electron microscopy characterizations indicate that this T _c enhancement arises from a phase transition from pristine Bi2212 to a mixture of superconducting Bi2212 and semiconducting Bi₂Sr₂CuO_6+? (Bi2201) during the shockwave treatment. The shockwave-treated sample exhibits n-type semiconductor properties (with an on-off ratio ~5), in contrast to the pure metallic pristine sample. Our study offers an alternative route for modifying the superconducting properties via a shockwave treatment. Furthermore, this method may provide a new approach for studying other temperature- and pressure-sensitive materials.

SUBMITTER: Liu T

PROVIDER: S-EPMC5532231 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Shockwave-Loading-Induced Enhancement of T c in Superconducting Bi2Sr2CaCu2O8+δ.

Liu Tiansheng T He Chao C Wang Fengying F Liu Yingbin Y Xi Xiaoxiang X Zhong Ruidan R Gu Genda G

Scientific reports 20170727 1

We report a shockwave method for altering the properties of the superconductor material Bi2Sr2CaCu2O8+δ (Bi2212). We find that the superconducting transition temperature (T c) increases from 84 K for the pristine sample to 94 K for the sample treated at a temperature and pressure of ~1200 K and ~31 GPa, respectively. X-ray diffraction and transmission electron microscopy characterizations indicate that this T c enhancement arises ...[more]

PMID: 28751726

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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

Shockwave-Loading-Induced Enhancement of T _c in Superconducting Bi₂Sr₂CaCu₂O_8+?.

Publications

Shockwave-Loading-Induced Enhancement of T <sub>c</sub> in Superconducting Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub>.

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Dataset Information

Shockwave-Loading-Induced Enhancement of T c in Superconducting Bi2Sr2CaCu2O8+?.

Publications

Shockwave-Loading-Induced Enhancement of T <sub>c</sub> in Superconducting Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub>.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Shockwave-Loading-Induced Enhancement of T _c in Superconducting Bi₂Sr₂CaCu₂O_8+?.