1
|
Iron-Based Superconducting Nanowires: Electric Transport and Voltage-Noise Properties. NANOMATERIALS 2020; 10:nano10050862. [PMID: 32365791 PMCID: PMC7711438 DOI: 10.3390/nano10050862] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 12/01/2022]
Abstract
The discovery of iron-based superconductors paved the way for advanced possible applications, mostly in high magnetic fields, but also in electronics. Among superconductive devices, nanowire detectors have raised a large interest in recent years, due to their ability to detect a single photon in the visible and infrared (IR) spectral region. Although not yet optimal for single-photon detection, iron-based superconducting nanowire detectors would bring clear advantages due to their high operating temperature, also possibly profiting of other peculiar material properties. However, there are several challenges yet to be overcome, regarding mainly: fabrication of ultra-thin films, appropriate passivation techniques, optimization of nano-patterning, and high-quality electrical contacts. Test nanowire structures, made by ultra-thin films of Co-doped BaFe2As2, have been fabricated and characterized in their transport and intrinsic noise properties. The results on the realized nanostructures show good properties in terms of material resistivity and critical current. Details on the fabrication and low temperature characterization of the realized nanodevices are presented, together with a study of possible degradation phenomena induced by ageing effects.
Collapse
|
2
|
Low-Frequency Dynamics of Strongly Correlated Electrons in (BEDT-TTF)2X Studied by Fluctuation Spectroscopy. CRYSTALS 2018. [DOI: 10.3390/cryst8040166] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fluctuation spectroscopy measurements of quasi-two-dimensional organic charge-transfer salts (BEDT-TTF) 2 X are reviewed. In the past decade, the method has served as a new approach for studying the low-frequency dynamics of strongly correlated charge carriers in these materials. We review some basic aspects of electronic fluctuations in solids, and give an overview of selected problems where the analysis of 1 / f -type fluctuations and the corresponding slow dynamics provide a better understanding of the underlying physics. These examples are related to (1) an inhomogeneous current distribution due to phase separation and/or a percolative transition; (2) slow dynamics due to a glassy freezing either of structural degrees of freedom coupling to the electronic properties or (3) of the electrons themselves, e.g., when residing on a highly-frustrated crystal lattice, where slow and heterogeneous dynamics are key experimental properties for the vitrification process of a supercooled charge-liquid. Another example is (4), the near divergence and critical slowing down of charge carrier fluctuations at the finite-temperature critical endpoint of the Mott metal-insulator transition. Here also indications for a glassy freezing and temporal and spatial correlated dynamics are found. Mapping out the region of ergodicity breaking and understanding the influence of disorder on the temporal and spatial correlated fluctuations will be an important realm of future studies, as well as the fluctuation properties deep in the Mott or charge-ordered insulating states providing a connection to relaxor or ordered ferroelectric states studied by dielectric spectroscopy.
Collapse
|
3
|
Barone C, Romeo F, Pagano S, Adamo M, Nappi C, Sarnelli E, Kurth F, Iida K. Probing transport mechanisms of BaFe₂As₂ superconducting films and grain boundary junctions by noise spectroscopy. Sci Rep 2014; 4:6163. [PMID: 25145385 PMCID: PMC4141261 DOI: 10.1038/srep06163] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 07/31/2014] [Indexed: 11/09/2022] Open
Abstract
An important step forward for the understanding of high-temperature superconductivity has been the discovery of iron-based superconductors. Among these compounds, iron pnictides could be used for high-field magnet applications, resulting more advantageous over conventional superconductors, due to a high upper critical field as well as its low anisotropy at low temperatures. However, the principal obstacle in fabricating high quality superconducting wires and tapes is given by grain boundaries. In order to study these effects, the dc transport and voltage-noise properties of Co-doped BaFe₂As₂ superconducting films with artificial grain boundary junctions have been investigated. A specific procedure allows the separation of the film noise from that of the junction. While the former shows a standard 1/f behaviour, the latter is characterized by an unconventional temperature-dependent multi-Lorentzian voltage-spectral density. Moreover, below the film superconducting critical temperature, a peculiar noise spectrum is found for the grain boundary junction. Possible theoretical interpretation of these phenomena is proposed.
Collapse
Affiliation(s)
- C. Barone
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - F. Romeo
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - S. Pagano
- Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - M. Adamo
- CNR-SPIN Salerno, Università di Salerno, I-84084 Fisciano, Salerno, Italy
| | - C. Nappi
- CNR-SPIN Napoli, Via Campi Flegrei 34, I-80078 Pozzuoli, Napoli, Italy
| | - E. Sarnelli
- CNR-SPIN Napoli, Via Campi Flegrei 34, I-80078 Pozzuoli, Napoli, Italy
| | - F. Kurth
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, PO Box 270116, 01171 Dresden, Germany
| | - K. Iida
- Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, PO Box 270116, 01171 Dresden, Germany
| |
Collapse
|
4
|
Koushik R, Kumar S, Amin KR, Mondal M, Jesudasan J, Bid A, Raychaudhuri P, Ghosh A. Correlated conductance fluctuations close to the Berezinskii-Kosterlitz-Thouless transition in ultrathin NbN films. PHYSICAL REVIEW LETTERS 2013; 111:197001. [PMID: 24266483 DOI: 10.1103/physrevlett.111.197001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 08/17/2013] [Indexed: 06/02/2023]
Abstract
We probe the presence of long-range correlations in phase fluctuations by analyzing the higher-order spectrum of resistance fluctuations in ultrathin NbN superconducting films. The non-Gaussian component of resistance fluctuations is found to be sensitive to film thickness close to the transition, which allows us to distinguish between mean field and Berezinskii-Kosterlitz-Thouless (BKT) type superconducting transitions. The extent of non-Gaussianity was found to be bounded by the BKT and mean field transition temperatures and depends strongly on the roughness and structural inhomogeneity of the superconducting films. Our experiment outlines a novel fluctuation-based kinetic probe in detecting the nature of superconductivity in disordered low-dimensional materials.
Collapse
Affiliation(s)
- R Koushik
- Department of Physics, Indian Institute of Science, Bangalore 560 012, India
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Müller J. Fluctuation Spectroscopy: A New Approach for Studying Low‐Dimensional Molecular Metals. Chemphyschem 2011; 12:1222-45. [DOI: 10.1002/cphc.201000814] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Indexed: 11/12/2022]
Affiliation(s)
- Jens Müller
- Institute of Physics, Goethe University Frankfurt, Max‐von‐Laue‐Str. 1, 60438 Frankfurt (M) (Germany), Fax: (+49) 69‐798‐47227
| |
Collapse
|
6
|
Müller J, Brandenburg J, Schlueter JA. Magnetic-field induced crossover of superconducting percolation regimes in the layered organic Mott system kappa-(BEDT-TTF)2Cu[N(CN) 2]Cl. PHYSICAL REVIEW LETTERS 2009; 102:047004. [PMID: 19257466 DOI: 10.1103/physrevlett.102.047004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2008] [Indexed: 05/27/2023]
Abstract
Fluctuation spectroscopy is used to investigate the organic bandwidth-controlled Mott system kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Cl. We find evidence for percolative-type superconductivity in the spatially inhomogeneous coexistence region of antiferromagnetic insulating and superconducting states. When the superconducting transition is driven by a magnetic field, percolation seems to be dominated by instable superconducting clusters upon approaching T(c)(B) from above, before a "classical" type of percolation is resumed at low fields, dominated by the fractional change of superconducting clusters. The 1/f noise is resolved into Lorentzian spectra in the crossover region, where the action of an individual fluctuator is enhanced, pointing to a mesoscopic phase separation.
Collapse
Affiliation(s)
- Jens Müller
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer-Strasse 40, 01187 Dresden, Germany.
| | | | | |
Collapse
|
7
|
Hao J, Huang K. Low-frequency 1/f noise in oxide material with giant magnetoresistance behavior. CHINESE SCIENCE BULLETIN-CHINESE 1997. [DOI: 10.1007/bf03182794] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
8
|
Influence of substrate on the excess electrical noise in the normal state of YBa2Cu3O7-? thin films. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf00727553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
9
|
Liu S, Lian G, Liu G, Wang M, Li G, Xiong G, Yan S. Normal-state 1/f noise in YBa2Cu3O7- delta /PrBa2Cu3O7- delta superlattices with a two-unit-cell-thick YBa2Cu3O7- delta layer in one period. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:6751-6753. [PMID: 9977219 DOI: 10.1103/physrevb.51.6751] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
10
|
Feng Y, Dian-lin Z, Ji-wu X. Thermally activated behavior of 1/f noise in YBa2Cu3O7- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:1334-1337. [PMID: 9978299 DOI: 10.1103/physrevb.51.1334] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
11
|
Liu L, Zhang K, Jaeger HM, Buchholz DB, Chang RP. Normal-state resistance fluctuations in high-Tc cuprate films. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3679-3682. [PMID: 10011255 DOI: 10.1103/physrevb.49.3679] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
12
|
Aponte JM, Bellorín A, Oentrich R, Gutiérrez G, Octavio M. Resistance noise in high-Tc and low-Tc granular superconducting films. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8964-8967. [PMID: 10004944 DOI: 10.1103/physrevb.47.8964] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
13
|
Han KH, Joo MK, Shin HJ, Lee SI. Measurements of noise spectral densities for a high-Tc superconductor: Single-crystal Bi2Sr2CaCu2Ox. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:11835-11839. [PMID: 10003079 DOI: 10.1103/physrevb.46.11835] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
14
|
Song Y, Misra A, Crooker PP, Gaines JR. Anisotropic 1/f noise and motion of magnetic vortices in YBa2Cu3O7- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:7574-7576. [PMID: 10000562 DOI: 10.1103/physrevb.45.7574] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
15
|
Celasco M, Masoero A, Mazzetti P, Stepanescu A. Evidence of current-noise hysteresis in superconducting YBa2Cu3O7- delta specimens in a magnetic field. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:5366-5368. [PMID: 9998361 DOI: 10.1103/physrevb.44.5366] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
16
|
Song Y, Misra A, Crooker PP, Gaines JR. 1/f noise and morphology of YBa2Cu3O7- delta single crystals. PHYSICAL REVIEW LETTERS 1991; 66:825-828. [PMID: 10043910 DOI: 10.1103/physrevlett.66.825] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
17
|
Lee JH, Lee SC, Khim ZG. Noise measurement near the transition region in YBa2Cu3O7- delta thin-film superconductor. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:6806-6809. [PMID: 9991053 DOI: 10.1103/physrevb.40.6806] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|