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

D. P. Lozano; S. Couet; C. Petermann; G. Hamoir; J. K. Jochum; T. Picot; E. Menéndez; K. Houben; V. Joly; V. A. Antohe; Michael Y. Hu; B. M. Leu; A. Alatas; Ayman H. Said; S. Roelants; B. Partoens; M. V. Milošević; F. M. Peeters; L. Piraux; J. Van De Vondel; A. Vantomme; K. Temst; M. J. Van Bael

doi:10.1103/PhysRevB.99.064512

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

D. P. Lozano, S. Couet, C. Petermann, G. Hamoir, J. K. Jochum, T. Picot, E. Menéndez, K. Houben, V. Joly, V. A. Antohe, Michael Y. Hu, B. M. Leu, A. Alatas, Ayman H. Said, S. Roelants, B. Partoens, M. V. Milošević, F. M. Peeters, L. Piraux, J. Van De VondelA. Vantomme, K. Temst, M. J. Van Bael

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Abstract

© 2019 American Physical Society. 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. 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.

Original language	English
Article number	064512
Journal	Physical Review B
Volume	99
DOIs	https://doi.org/10.1103/PhysRevB.99.064512
Publication status	Published - 21 Feb 2019

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Lozano, D. P., Couet, S., Petermann, C., Hamoir, G., Jochum, J. K., Picot, T., Menéndez, E., Houben, K., Joly, V., Antohe, V. A., Hu, M. Y., Leu, B. M., Alatas, A., Said, A. H., Roelants, S., Partoens, B., Milošević, M. V., Peeters, F. M., Piraux, L., ... Van Bael, M. J. (2019). Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects. Physical Review B, 99, [064512]. https://doi.org/10.1103/PhysRevB.99.064512

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title = "Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects",

abstract = "{\textcopyright} 2019 American Physical Society. 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. 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.",

author = "Lozano, {D. P.} and S. Couet and C. Petermann and G. Hamoir and Jochum, {J. K.} and T. Picot and E. Men{\'e}ndez and K. Houben and V. Joly and Antohe, {V. A.} and Hu, {Michael Y.} and Leu, {B. M.} and A. Alatas and Said, {Ayman H.} and S. Roelants and B. Partoens and Milo{\v s}evi{\'c}, {M. V.} and Peeters, {F. M.} and L. Piraux and {Van De Vondel}, J. and A. Vantomme and K. Temst and {Van Bael}, {M. J.}",

year = "2019",

month = feb,

day = "21",

doi = "10.1103/PhysRevB.99.064512",

language = "English",

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Lozano, DP, Couet, S, Petermann, C, Hamoir, G, Jochum, JK, Picot, T, Menéndez, E, Houben, K, Joly, V, Antohe, VA, Hu, MY, Leu, BM, Alatas, A, Said, AH, Roelants, S, Partoens, B, Milošević, MV, Peeters, FM, Piraux, L, Van De Vondel, J, Vantomme, A, Temst, K & Van Bael, MJ 2019, 'Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects', Physical Review B, vol. 99, 064512. https://doi.org/10.1103/PhysRevB.99.064512

TY - JOUR

T1 - Experimental observation of electron-phonon coupling enhancement in Sn nanowires caused by phonon confinement effects

AU - Lozano, D. P.

AU - Couet, S.

AU - Petermann, C.

AU - Hamoir, G.

AU - Jochum, J. K.

AU - Picot, T.

AU - Menéndez, E.

AU - Houben, K.

AU - Joly, V.

AU - Antohe, V. A.

AU - Hu, Michael Y.

AU - Leu, B. M.

AU - Alatas, A.

AU - Said, Ayman H.

AU - Roelants, S.

AU - Partoens, B.

AU - Milošević, M. V.

AU - Peeters, F. M.

AU - Piraux, L.

AU - Van De Vondel, J.

AU - Vantomme, A.

AU - Temst, K.

AU - Van Bael, M. J.

PY - 2019/2/21

Y1 - 2019/2/21

N2 - © 2019 American Physical Society. 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. 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.

AB - © 2019 American Physical Society. 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. 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.

U2 - 10.1103/PhysRevB.99.064512

DO - 10.1103/PhysRevB.99.064512

M3 - Article

VL - 99

M1 - 064512

ER -

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

Abstract

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