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Title: Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe 1-x Te x thin films

Authors:
; ; ; ; ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Daegu Gyeongbuk Inst. of Science and Technology (DGIST), Daegu (Korea, Republic of); Gwangju Inst. of Science and Technology (Korea, Republic of); Univ. of Santiago de Compostela (Spain)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Research Foundation of Korea (NRF); Ministry of Science, ICT and Future Planning (Korea, Republic of); European Commission (EC). European Regional Development Fund (ERDF); Xunta de Galicia
OSTI Identifier:
1412713
Report Number(s):
BNL-114526-2017-JA; BNL-114535-2017-JA
Journal ID: ISSN 1367-2630; R&D Project: PM016; KC0201050; TRN: US1800329
Grant/Contract Number:
SC0012704; NRF-2015M2B2A9028507; NRF-2016R1A2B4012672; NRF-2014S1A2A2028361; 2012R1A3A2048816; FIS2016-79109-P; AGRUP 2015/11
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 9; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; fluctuations; magnetoconductivity; lattice strain; FeSe1-xTex thin film

Citation Formats

Ahmad, D., Choi, W. J., Seo, Y. I., Seo, Sehun, Lee, Sanghan, Park, Tuson, Mosqueira, J., Gu, Genda, and Kwon, Yong Seung. Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe 1-x Te x thin films. United States: N. p., 2017. Web. doi:10.1088/1367-2630/aa76ad.
Ahmad, D., Choi, W. J., Seo, Y. I., Seo, Sehun, Lee, Sanghan, Park, Tuson, Mosqueira, J., Gu, Genda, & Kwon, Yong Seung. Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe 1-x Te x thin films. United States. doi:10.1088/1367-2630/aa76ad.
Ahmad, D., Choi, W. J., Seo, Y. I., Seo, Sehun, Lee, Sanghan, Park, Tuson, Mosqueira, J., Gu, Genda, and Kwon, Yong Seung. 2017. "Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe 1-x Te x thin films". United States. doi:10.1088/1367-2630/aa76ad. https://www.osti.gov/servlets/purl/1412713.
@article{osti_1412713,
title = {Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe 1-x Te x thin films},
author = {Ahmad, D. and Choi, W. J. and Seo, Y. I. and Seo, Sehun and Lee, Sanghan and Park, Tuson and Mosqueira, J. and Gu, Genda and Kwon, Yong Seung},
abstractNote = {},
doi = {10.1088/1367-2630/aa76ad},
journal = {New Journal of Physics},
number = 9,
volume = 19,
place = {United States},
year = 2017,
month = 9
}

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  • A detailed study of normal-state magnetotransport properties in (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital x]] thin films with a zero-resistance critical temperature [ital T][sub [ital c]0]=105 K prepared by dc-magnetron sputtering on MgO substrates is reported. Measurements of the electrical resistivity, the magnetoresistance, and the Hall effect are analyzed with regard to contributions of the superconducting order-parameter thermodynamic fluctuations, using theories for two-dimensional, layered superconductors. We have obtained a consistent set of parameters, i.e., the in-plane coherence length [xi][sub [ital a][ital b]](0)=1.6 nm, the out-of-plane coherence length [xi][sub [ital c]](0)=0.14 nm, and the electron-hole asymmetry parameter [beta]=[minus]0.38. At temperatures belowmore » 118 K, we observe a remarkable enhancement (above theoretical predictions) of both the excess Hall effect and magnetoconductivity, whereas no such effect is detected for the zero-field paraconductivity. The above anomalies are attributed to a nonuniform critical temperature distribution inside our samples and can be well explained assuming a Gaussian distribution of [ital T][sub [ital c]]'s with a standard deviation [delta][ital T][sub [ital c]]=2.3 K. The excess Hall effect caused by superconducting fluctuations is negative in the entire accessible temperature range, which indicates, together with the paraconductivity and magnetoconductivity results that the indirect (Maki-Thompson) fluctuation process for (Bi,Pb)[sub 2]Sr[sub 2]Ca[sub 2]Cu[sub 3]O[sub [ital x]] is vanishingly small at temperatures from [ital T][sub [ital c]] to 130 K.« less
  • We report detailed experimental results on the fluctuation-induced in-plane conductivity {Delta}{sigma}{sub {ital ab}}, magnetoconductivity {Delta}{tilde {sigma}}{sub {ital ab}}, and diamagnetism {Delta}{chi}{sub {ital ab}}, of high-quality Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} crystals. The data were obtained with magnetic fields {ital H} applied perpendicularly to the superconducting (CuO{sub 2}) planes and up to {mu}{sub 0}{ital H}=5 T, which not too close to the transition [for reduced temperatures {var_epsilon}{equivalent_to}({ital T}{minus}{ital T}{sub {ital C}0})/{ital T}{sub {ital C}0}{approx_gt}10{sup {minus}2}] may be considered in the weak magnetic field limit. In the mean field region (MFR) above the transition, these data are analyzed in terms of thermalmore » fluctuations of the superconducting order parameter amplitude (OPF), on the grounds of the existing theoretical approaches for layered superconductors that take into account the presence of two superconducting layers in the layer periodicity length, {ital s}, which for these compounds is equal to one-half the crystallographic unit-cell length in the {ital c} direction. These results show that, due to its strong {var_epsilon} dependence, {Delta}{tilde {sigma}}{sub {ital ab}} is dramatically affected by the presence of small {ital T}{sub {ital C}} inhomogeneities, associated with small oxygen content inhomogeneities uniformly distributed in the crystals. These inhomogeneity effects are taken into account, consistently with our {Delta}{sigma}{sub {ital ab}} and {Delta}{chi}{sub {ital ab}} results, by using an effective medium approach proposed by Maza and Vidal. In this way, the amplitude and the {var_epsilon} behavior of the three observables studied here are explained in terms of the direct OPF effects, at a quantitative level, confirming then the absence of appreciable indirect contributions [as, for instance, the Maki-Thompson and the density-of-states (DOS) terms]. (Abstract Truncated)« less
  • In this paper the authors summarize some of their theoretical results for the paraconductivity and for the fluctuation-induced in-plane magnetoconductivity in the weak magnetic field limit of layered superconductors with several interlayer separations. Also, they briefly discuss the existing experimental data obtained in untwinned YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} crystals.
  • We present a detailed investigation on the doping dependence of the upper critical field H{sub c2}(T) of FeSe{sub x}Te{sub 1−x} thin films (0.18 ≤ x ≤ 0.90) by measuring the electrical resistivity as a function of magnetic field. The H{sub c2}(T) curves exhibit a downturn behavior with decreasing temperature in all the samples, owing to the Pauli-limited effect (spin paramagnetic effect). The Pauli-limited effect on the upper critical field can be monotonically modulated by variation of the Se/Te composition. Our results show that Te-doping induced disorder and excess Fe atoms give rise to enhancement of the Pauli-limited effect.