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Title: Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates

Abstract

Here we performed an experimental study of the temperature and doping dependence of the energy-loss function of the bilayer and trilayer bismuth cuprates family. The primary aim is to obtain information on the energy stored in the Coulomb interaction between the conduction electrons, on the temperature dependence thereof, and on the change of Coulomb interaction when Cooper pairs are formed. We performed temperature-dependent ellipsometry measurements on several Bi2Sr2CaCu2O8₋x single crystals: underdoped with Tc=60, 70, and 83 K; optimally doped with Tc=91 K; overdoped with Tc=84, 81, 70, and 58 K; as well as optimally doped Bi2Sr2Ca2Cu3O10+x with Tc=110 K. Our first observation is that, as the temperature drops through Tc, the loss function in the range up to 2 eV displays a change of temperature dependence as compared to the temperature dependence in the normal state. This effect at—or close to—Tc depends strongly on doping, with a sign change for weak overdoping. The size of the observed change in Coulomb energy, using an extrapolation with reasonable assumptions about its q dependence, is about the same size as the condensation energy that has been measured in these compounds. Our results therefore lend support to the notion that the Coulomb energy ismore » an important factor for stabilizing the superconducting phase. Lastly, because of the restriction to small momentum, our observations do not exclude a possible significant contribution to the condensation energy of the Coulomb energy associated with the region of q around (π,π).« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF)
OSTI Identifier:
1305439
Alternate Identifier(s):
OSTI ID: 1336224
Report Number(s):
BNL-113255-2016-JA
Journal ID: ISSN 2160-3308; PRXHAE; 031027
Grant/Contract Number:  
SC00112704; AC02-07CH11358; SC0012704; AC02-98CH10886
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 6 Journal Issue: 3; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Levallois, J., Tran, M. K., Pouliot, D., Presura, C. N., Greene, L. H., Eckstein, J. N., Uccelli, J., Giannini, E., Gu, G. D., Leggett, A. J., and van der Marel, D. Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates. United States: N. p., 2016. Web. doi:10.1103/PhysRevX.6.031027.
Levallois, J., Tran, M. K., Pouliot, D., Presura, C. N., Greene, L. H., Eckstein, J. N., Uccelli, J., Giannini, E., Gu, G. D., Leggett, A. J., & van der Marel, D. Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates. United States. https://doi.org/10.1103/PhysRevX.6.031027
Levallois, J., Tran, M. K., Pouliot, D., Presura, C. N., Greene, L. H., Eckstein, J. N., Uccelli, J., Giannini, E., Gu, G. D., Leggett, A. J., and van der Marel, D. Wed . "Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates". United States. https://doi.org/10.1103/PhysRevX.6.031027.
@article{osti_1305439,
title = {Temperature-Dependent Ellipsometry Measurements of Partial Coulomb Energy in Superconducting Cuprates},
author = {Levallois, J. and Tran, M. K. and Pouliot, D. and Presura, C. N. and Greene, L. H. and Eckstein, J. N. and Uccelli, J. and Giannini, E. and Gu, G. D. and Leggett, A. J. and van der Marel, D.},
abstractNote = {Here we performed an experimental study of the temperature and doping dependence of the energy-loss function of the bilayer and trilayer bismuth cuprates family. The primary aim is to obtain information on the energy stored in the Coulomb interaction between the conduction electrons, on the temperature dependence thereof, and on the change of Coulomb interaction when Cooper pairs are formed. We performed temperature-dependent ellipsometry measurements on several Bi2Sr2CaCu2O8₋x single crystals: underdoped with Tc=60, 70, and 83 K; optimally doped with Tc=91 K; overdoped with Tc=84, 81, 70, and 58 K; as well as optimally doped Bi2Sr2Ca2Cu3O10+x with Tc=110 K. Our first observation is that, as the temperature drops through Tc, the loss function in the range up to 2 eV displays a change of temperature dependence as compared to the temperature dependence in the normal state. This effect at—or close to—Tc depends strongly on doping, with a sign change for weak overdoping. The size of the observed change in Coulomb energy, using an extrapolation with reasonable assumptions about its q dependence, is about the same size as the condensation energy that has been measured in these compounds. Our results therefore lend support to the notion that the Coulomb energy is an important factor for stabilizing the superconducting phase. Lastly, because of the restriction to small momentum, our observations do not exclude a possible significant contribution to the condensation energy of the Coulomb energy associated with the region of q around (π,π).},
doi = {10.1103/PhysRevX.6.031027},
journal = {Physical Review. X},
number = 3,
volume = 6,
place = {United States},
year = {Wed Aug 24 00:00:00 EDT 2016},
month = {Wed Aug 24 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevX.6.031027

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Cited by: 23 works
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Figures / Tables:

FIG. 1 FIG. 1: S–N difference of the partial Coulomb energy $E^{C}_{q}$ . Left: According to the MIR scenario (schematic). Right: Resulting from a BCS model calculation for d-wave symmetry, p = 0.16 hole doping, and the interaction adjusted such as to give Tc = 100 K. Both panels represent the qzmore » = 0 cut in momentum space, corresponding to electric field polarized along the planes. $E^{C}_{q}$ at q = 0 corresponds to the integral (Eq. (1)) of the optical in-plane loss-function.« less

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