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Title: Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La 2 - x Sr x CuO 4 ( x = 0.09 )

Abstract

We have studied the magnetic flux pinning behavior and Meissner effect for the high-$$T_{\rm c}$$ single crystal La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ ($x$ = 0.09) superconductor using the polarized neutron imaging method with varying magnetic field and temperature. In the Meissner state expulsion of magnetic field (switched on during the measurements) is visualized, and the signatures of mixed state with increasing temperature are observed. While, for flux pinning behavior between 5 K $$\leq$$ $T$ $$\leq$$ 15 K and $$H_{\rm ext}$$ = 63.5 mT (switched off during the measurements), the evolution of fringe pattern for both 0$$^{o}$$ and 90$$^{o}$$ sample orientation indicates magnetic flux pinning inside the bulk of the sample. At 25 K $$\leq$$ $T$ $$\leq$$ 32 K, a continuous decrease of inhomogeneously distribution pinned magnetic flux is observed, with the sample reaching a normal conducting state at $$T_{\rm c}$$ ($$\approx$$ 32 K). The flux pinning behavior is also explored as a function of $$H_{\rm ext}$$, at $T$ = 5 K. As expected, with increasing $$H_{\rm ext}$$ an increase in fringe density is observed, indicating an increase in magnetic flux pinning in the bulk of the sample. Therefore, in the present work for the first time we report bulk visualization of Meissner effect and flux pinning behavior in high-$$T_{\rm c}$$ La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ ($x$ = 0.09) superconductor. This study clearly demonstrates the potential of real space polarized neutron imaging technique for the visualization of the superconducting mixed state, particularly in the field of high-$$T_{\rm c}$$ superconductors.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1400203
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 96; Journal Issue: 10
Country of Publication:
United States
Language:
English

Citation Formats

Dhiman, I., Ziesche, R., Anand, V. K., Riik, L., Song, Gian, Islam, A. T. M. N., Tanaka, Isao, and Treimer, W. Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2-xSrxCuO4 ( x=0.09 ). United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.104517.
Dhiman, I., Ziesche, R., Anand, V. K., Riik, L., Song, Gian, Islam, A. T. M. N., Tanaka, Isao, & Treimer, W. Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2-xSrxCuO4 ( x=0.09 ). United States. doi:10.1103/PhysRevB.96.104517.
Dhiman, I., Ziesche, R., Anand, V. K., Riik, L., Song, Gian, Islam, A. T. M. N., Tanaka, Isao, and Treimer, W. Fri . "Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2-xSrxCuO4 ( x=0.09 )". United States. doi:10.1103/PhysRevB.96.104517.
@article{osti_1400203,
title = {Thermodynamics of Meissner effect and flux pinning behavior in the bulk of single-crystal La2-xSrxCuO4 ( x=0.09 )},
author = {Dhiman, I. and Ziesche, R. and Anand, V. K. and Riik, L. and Song, Gian and Islam, A. T. M. N. and Tanaka, Isao and Treimer, W.},
abstractNote = {We have studied the magnetic flux pinning behavior and Meissner effect for the high-$T_{\rm c}$ single crystal La$_{2-x}$Sr$_{x}$CuO$_{4}$ ($x$ = 0.09) superconductor using the polarized neutron imaging method with varying magnetic field and temperature. In the Meissner state expulsion of magnetic field (switched on during the measurements) is visualized, and the signatures of mixed state with increasing temperature are observed. While, for flux pinning behavior between 5 K $\leq$ $T$ $\leq$ 15 K and $H_{\rm ext}$ = 63.5 mT (switched off during the measurements), the evolution of fringe pattern for both 0$^{o}$ and 90$^{o}$ sample orientation indicates magnetic flux pinning inside the bulk of the sample. At 25 K $\leq$ $T$ $\leq$ 32 K, a continuous decrease of inhomogeneously distribution pinned magnetic flux is observed, with the sample reaching a normal conducting state at $T_{\rm c}$ ($\approx$ 32 K). The flux pinning behavior is also explored as a function of $H_{\rm ext}$, at $T$ = 5 K. As expected, with increasing $H_{\rm ext}$ an increase in fringe density is observed, indicating an increase in magnetic flux pinning in the bulk of the sample. Therefore, in the present work for the first time we report bulk visualization of Meissner effect and flux pinning behavior in high-$T_{\rm c}$ La$_{2-x}$Sr$_{x}$CuO$_{4}$ ($x$ = 0.09) superconductor. This study clearly demonstrates the potential of real space polarized neutron imaging technique for the visualization of the superconducting mixed state, particularly in the field of high-$T_{\rm c}$ superconductors.},
doi = {10.1103/PhysRevB.96.104517},
journal = {Physical Review B},
number = 10,
volume = 96,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}