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Yadav S, Gajar B, Aloysius RP, Sahoo S. Interplay between superconducting fluctuations and weak localization in disordered TiN thin films. NANOSCALE 2024. [PMID: 39417772 DOI: 10.1039/d4nr02639j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2024]
Abstract
The interplay between superconducting fluctuations (SFs) and weak localization (WL) has been probed by temperature dependent resistance [R(T)] and magnetoresistance (MR) measurements in two-dimensional disordered superconducting TiN thin films. Within a narrow range of temperature above transition temperature (Tc), the coexistence of SF-mediated positive MR and WL-led negative MR in different ranges of magnetic fields and a crossover from positive MR to negative MR with an increase in temperature are reported herein. The crossover temperature coincides with a characteristic temperature (Tmax) at which a resistance peak appears in the zero-field R(T). The resistance peak and associated magnetoresistance anomalies are addressed using quantum corrections to conductivity (QCC) theory. We show that WL can be accounted for the observed negative MR. By introducing individual coefficients to both SFs and WL contributions, the dominance of one over the other is monitored with respect to temperature. It is observed that just above Tc, SFs dominate; with an increase in temperature, the contributions from both become comparable; and finally, at Tmax, WL takes over completely. The presented approach may be adopted to compare various quantum contributions in two-dimensional superconductors, particularly in the regime where both SFs and WL are pronounced.
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Affiliation(s)
- Sachin Yadav
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Bikash Gajar
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - R P Aloysius
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Sangeeta Sahoo
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110012, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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Watson MD, Feng Y, Nicholson CW, Monney C, Riley JM, Iwasawa H, Refson K, Sacksteder V, Adroja DT, Zhao J, Hoesch M. Multiband One-Dimensional Electronic Structure and Spectroscopic Signature of Tomonaga-Luttinger Liquid Behavior in K_{2}Cr_{3}As_{3}. PHYSICAL REVIEW LETTERS 2017; 118:097002. [PMID: 28306267 DOI: 10.1103/physrevlett.118.097002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Indexed: 06/06/2023]
Abstract
We present angle-resolved photoemission spectroscopy measurements of the quasi-one-dimensional superconductor K_{2}Cr_{3}As_{3}. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ∼200 meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds.
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Affiliation(s)
- M D Watson
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - Y Feng
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - C W Nicholson
- Department of Physical Chemistry, Fritz-Haber-Institut of the Max Planck Society, Faradayweg 4-6, Berlin 14915, Germany
| | - C Monney
- Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - J M Riley
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
- SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, United Kingdom
| | - H Iwasawa
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
| | - K Refson
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom
| | - V Sacksteder
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
| | - D T Adroja
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom
- Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
| | - J Zhao
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
| | - M Hoesch
- Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, United Kingdom
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Mitra S, Tewari GC, Mahalu D, Shahar D. Negative Magnetoresistance in Amorphous Indium Oxide Wires. Sci Rep 2016; 6:37687. [PMID: 27876859 PMCID: PMC5120288 DOI: 10.1038/srep37687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 11/01/2016] [Indexed: 11/08/2022] Open
Abstract
We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there exist a finite resistance at the lowest temperature. The R(T) broadening was explained by available phase slip models. At low field, and far below the superconducting critical temperature, the wires with diameter equal to or less than 100 nm, show negative magnetoresistance (nMR). The magnitude of nMR and the crossover field are found to be dependent on both temperature and the cross-sectional area. We find that this intriguing behavior originates from the interplay between two field dependent contributions.
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Affiliation(s)
- Sreemanta Mitra
- The Weizmann Institute of Science, Department of Condensed Matter Physics, Rehovot, 76100, Israel
| | - Girish C Tewari
- The Weizmann Institute of Science, Department of Condensed Matter Physics, Rehovot, 76100, Israel
| | - Diana Mahalu
- The Weizmann Institute of Science, Department of Condensed Matter Physics, Rehovot, 76100, Israel
| | - Dan Shahar
- The Weizmann Institute of Science, Department of Condensed Matter Physics, Rehovot, 76100, Israel
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Petrović AP, Ansermet D, Chernyshov D, Hoesch M, Salloum D, Gougeon P, Potel M, Boeri L, Panagopoulos C. A disorder-enhanced quasi-one-dimensional superconductor. Nat Commun 2016; 7:12262. [PMID: 27448209 PMCID: PMC4961838 DOI: 10.1038/ncomms12262] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 06/17/2016] [Indexed: 12/01/2022] Open
Abstract
A powerful approach to analysing quantum systems with dimensionality d>1 involves adding a weak coupling to an array of one-dimensional (1D) chains. The resultant quasi-1D (q1D) systems can exhibit long-range order at low temperature, but are heavily influenced by interactions and disorder due to their large anisotropies. Real q1D materials are therefore ideal candidates not only to provoke, test and refine theories of strongly correlated matter, but also to search for unusual emergent electronic phases. Here we report the unprecedented enhancement of a superconducting instability by disorder in single crystals of Na2−δMo6Se6, a q1D superconductor comprising MoSe chains weakly coupled by Na atoms. We argue that disorder-enhanced Coulomb pair-breaking (which usually destroys superconductivity) may be averted due to a screened long-range Coulomb repulsion intrinsic to disordered q1D materials. Our results illustrate the capability of disorder to tune and induce new correlated electron physics in low-dimensional materials. Disorder localizes electrons, which is usually detrimental to the onset of superconductivity. Here, Petrović et al. report a disorder-enhanced superconducting instability in quasi-one dimensional Na2-dMo6Se6 and suggest that this effect may originate from an intrinsically screened Coulomb repulsion.
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Affiliation(s)
- A P Petrović
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - D Ansermet
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - D Chernyshov
- Swiss-Norwegian Beamlines, European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38043 Grenoble Cedex, France
| | - M Hoesch
- Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxfordshire, UK
| | - D Salloum
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France.,Faculty of Science III, Lebanese University, PO Box 826, Kobbeh-Tripoli, Lebanon
| | - P Gougeon
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - M Potel
- Sciences Chimiques, CSM UMR CNRS 6226, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - L Boeri
- Institute for Theoretical and Computational Physics, TU Graz, Petersgasse 16, 8010 Graz, Austria
| | - C Panagopoulos
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
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