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Title: Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects

Abstract

Reducing the size of a superconductor below its characteristic length scales can either enhance or suppress its critical temperature ( Tc). Depending on the bulk value of the electron-phonon coupling strength, electronic and phonon confinement effects will play different roles in the modification of Tc. Experimentally disentangling each contribution has remained a challenge. We have measured both the phonon density of states and Tc of Sn nanowires with diameters of 18, 35, and 100 nm in order to quantify the effects of phonon confinement on superconductivity. Furthermore, we observe a shift of the phonon frequency towards the low-energy region and an increase in the electron-phonon coupling constant that can account for the measured increase in Tc.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1];  [4];  [5];  [6];  [5];  [5];  [7];  [7];  [7];  [7];  [2];  [1] more »;  [1];  [1];  [1] « less
  1. KU Leuven, Leuven (Belgium)
  2. Univ. catholique de Louvain, Louvain-la-Neuve (Belgium)
  3. KU Leuven, Leuven (Belgium); Univ. Autonoma de Barcelona, Cerdanyola del Valles (Spain)
  4. Univ. catholique de Louvain, Louvain-la-Neuve (Belgium); Univ. of Bucharest, Bucharest-Magurele (Romania)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Miami Univ., Oxford, OH (United States)
  7. Univ. Antwerpen, Antwerpen (Belgium)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1497389
Alternate Identifier(s):
OSTI ID: 1546323
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Lozano, D. P., Couet, S., Petermann, C., Hamoir, G., Jochum, J. K., Picot, T., Menéndez, E., Houben, K., Joly, V., Antohe, V. A., Hu, Michael Y., Leu, B. M., Alatas, A., Said, Ayman H., Roelants, S., Partoens, B., Milošević, M. V., Peeters, F. M., Piraux, L., Van de Vondel, J., Vantomme, A., Temst, K., and Van Bael, M. J. Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.064512.
Lozano, D. P., Couet, S., Petermann, C., Hamoir, G., Jochum, J. K., Picot, T., Menéndez, E., Houben, K., Joly, V., Antohe, V. A., Hu, Michael Y., Leu, B. M., Alatas, A., Said, Ayman H., Roelants, S., Partoens, B., Milošević, M. V., Peeters, F. M., Piraux, L., Van de Vondel, J., Vantomme, A., Temst, K., & Van Bael, M. J. Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects. United States. doi:10.1103/PhysRevB.99.064512.
Lozano, D. P., Couet, S., Petermann, C., Hamoir, G., Jochum, J. K., Picot, T., Menéndez, E., Houben, K., Joly, V., Antohe, V. A., Hu, Michael Y., Leu, B. M., Alatas, A., Said, Ayman H., Roelants, S., Partoens, B., Milošević, M. V., Peeters, F. M., Piraux, L., Van de Vondel, J., Vantomme, A., Temst, K., and Van Bael, M. J. Thu . "Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects". United States. doi:10.1103/PhysRevB.99.064512.
@article{osti_1497389,
title = {Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects},
author = {Lozano, D. P. and Couet, S. and Petermann, C. and Hamoir, G. and Jochum, J. K. and Picot, T. and Menéndez, E. and Houben, K. and Joly, V. and Antohe, V. A. and Hu, Michael Y. and Leu, B. M. and Alatas, A. and Said, Ayman H. and Roelants, S. and Partoens, B. and Milošević, M. V. and Peeters, F. M. and Piraux, L. and Van de Vondel, J. and Vantomme, A. and Temst, K. and Van Bael, M. J.},
abstractNote = {Reducing the size of a superconductor below its characteristic length scales can either enhance or suppress its critical temperature (Tc). Depending on the bulk value of the electron-phonon coupling strength, electronic and phonon confinement effects will play different roles in the modification of Tc. Experimentally disentangling each contribution has remained a challenge. We have measured both the phonon density of states and Tc of Sn nanowires with diameters of 18, 35, and 100 nm in order to quantify the effects of phonon confinement on superconductivity. Furthermore, we observe a shift of the phonon frequency towards the low-energy region and an increase in the electron-phonon coupling constant that can account for the measured increase in Tc.},
doi = {10.1103/PhysRevB.99.064512},
journal = {Physical Review B},
number = 6,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

Superconducting transition in Nb nanowires fabricated using focused ion beam
journal, October 2009