Locating the Missing Superconducting Electrons in the Overdoped Cuprates La2–xSrxCuO4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates]

Mahmood, Fahad; He, Xi; Božović, Ivan; Armitage, N. P.

doi:10.1103/PhysRevLett.122.027003

Title: Locating the Missing Superconducting Electrons in the Overdoped Cuprates ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ [Locating the Missing Superconducting Electrons in Overdoped Cuprates]

Abstract

Overdoped high-temperature cuprate superconductors have often been understood within the standard BCS framework of superconductivity. However, measurements in a variety of overdoped cuprates indicate that the superfluid density is much smaller than expected from BCS theory and decreases smoothly to zero as the doping is increased. Here, we combine time-domain THz spectroscopy with kHz range mutual inductance measurements on the same overdoped La_2–xSr_xCuO₄ films to determine the total, superfluid, and uncondensed spectral weight as a function of doping. A significant fraction of the carriers remains uncondensed in a wide Drude-like peak as T → 0, while the superfluid density remains linear in temperature. These observations are seemingly inconsistent with existing, realistic theories of impurity scattering suppressing the superfluid density in a BCS-like d-wave superconductor. Furthermore, our large measurement frequency range gives us a unique look at the low frequency spectral weight distribution, which may suggest the presence of quantum phase fluctuations as the critical doping is approached.

Authors:

Mahmood, Fahad ^[1]; He, Xi ^[2];

^[2]; Armitage, N. P. ^[1]

The Johns Hopkins Univ., Baltimore, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)

Publication Date:: Wed Jan 16 00:00:00 EST 2019

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1493573

Alternate Identifier(s):: OSTI ID: 1491058

Report Number(s):: BNL-211247-2019-JAAM
Journal ID: ISSN 0031-9007; PRLTAO

Grant/Contract Number:: SC0012704; FG02-08ER46544

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 122; Journal Issue: 2; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Mahmood, Fahad, He, Xi, Božović, Ivan, and Armitage, N. P. Locating the Missing Superconducting Electrons in the Overdoped Cuprates La2–xSrxCuO4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates].  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevLett.122.027003.

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                    Mahmood, Fahad, He, Xi, Božović, Ivan, & Armitage, N. P. Locating the Missing Superconducting Electrons in the Overdoped Cuprates La2–xSrxCuO4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates].  United States.  https://doi.org/10.1103/PhysRevLett.122.027003

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                    Mahmood, Fahad, He, Xi, Božović, Ivan, and Armitage, N. P. Wed .  
"Locating the Missing Superconducting Electrons in the Overdoped Cuprates La2–xSrxCuO4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates]".  United States.  https://doi.org/10.1103/PhysRevLett.122.027003.  https://www.osti.gov/servlets/purl/1493573.

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@article{osti_1493573,

  title        = {Locating the Missing Superconducting Electrons in the Overdoped Cuprates La2–xSrxCuO4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates]},

  author       = {Mahmood, Fahad and He, Xi and Božović, Ivan and Armitage, N. P.},

  abstractNote = {Overdoped high-temperature cuprate superconductors have often been understood within the standard BCS framework of superconductivity. However, measurements in a variety of overdoped cuprates indicate that the superfluid density is much smaller than expected from BCS theory and decreases smoothly to zero as the doping is increased. Here, we combine time-domain THz spectroscopy with kHz range mutual inductance measurements on the same overdoped La2–xSrxCuO4 films to determine the total, superfluid, and uncondensed spectral weight as a function of doping. A significant fraction of the carriers remains uncondensed in a wide Drude-like peak as T → 0, while the superfluid density remains linear in temperature. These observations are seemingly inconsistent with existing, realistic theories of impurity scattering suppressing the superfluid density in a BCS-like d-wave superconductor. Furthermore, our large measurement frequency range gives us a unique look at the low frequency spectral weight distribution, which may suggest the presence of quantum phase fluctuations as the critical doping is approached.},

  doi          = {10.1103/PhysRevLett.122.027003},

  journal      = {Physical Review Letters},

  number       = 2,

  volume       = 122,

  place        = {United States},

  year         = {Wed Jan 16 00:00:00 EST 2019},

  month        = {Wed Jan 16 00:00:00 EST 2019}

}

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Works referencing / citing this record:

The Quest for High(er) Tc in BaBiO3-Based Heterostructures
journal, November 2019

Božović, Ivan; He, Xi; Bollinger, Anthony T.
Journal of Superconductivity and Novel Magnetism, Vol. 33, Issue 1
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Parabolic Scaling in Overdoped Cuprate: a Statistical Field Theory Approach
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Tao, Yong
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Superfluid stiffness in cuprates: Effect of Mott transition and phase competition
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Impact of electron-electron interactions on the superfluid density of dirty superconductors
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Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film
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Yao, Gang; Duan, Ming-Chao; Liu, Ningning
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Scaling between Superfluid Density and Tc in Overdoped La2−xSrxCuO4 Films
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text, January 2019

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Title: Locating the Missing Superconducting Electrons in the Overdoped Cuprates La 2 – x Sr x CuO 4 [Locating the Missing Superconducting Electrons in Overdoped Cuprates]

Abstract

Citation Formats

Onset of Global Phase Coherence in Josephson-Junction Arrays: A Dissipative Phase Transition journal, May 1986

Anomalously sharp superconducting transitions in overdoped La 2 − x Sr x CuO 4 films journal, December 2010

d -wave superconductor as a model of high- T c superconductors journal, January 1994

Microwave conductivity of d -wave superconductors journal, November 1993

Effect of strong scattering on the low-temperature penetration depth of a d -wave superconductor journal, August 1993

Fermi Surface and Quasiparticle Excitations of Overdoped Tl 2 Ba 2 CuO 6 + δ journal, August 2005

Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4 journal, March 2011

Optical conductivity of overdoped cuprate superconductors: Application to La 2 − x Sr x CuO 4 journal, August 2018

Muon spin rotation study of the correlation between T c and n s / m * in overdoped Tl 2 Ba 2 CuO 6 + δ journal, September 1993

Impurity-induced quasiparticle transport and universal-limit Wiedemann-Franz violation in d -wave superconductors journal, July 2000

Phase fluctuations, dissipation, and superfluid stiffness in d -wave superconductors journal, April 2001

From quantum matter to high-temperature superconductivity in copper oxides journal, February 2015

Low-temperature AC conductivity of Bi2Sr2CaCu2O8+δ journal, May 2000

Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8+delta journal, March 2002

Vanishing of phase coherence in underdoped Bi2Sr2CaCu2O8+δ journal, March 1999

Magnetic-field penetration depth in TI2Ba2CuO6+δ in the overdoped regime journal, August 1993

Disorder and superfluid density in overdoped cuprate superconductors journal, July 2017

Superconductivity and the c Axis Spectral Weight of High-Tc Superconductors journal, August 1999

Phase Fluctuations in a Strongly Disordered s -Wave NbN Superconductor Close to the Metal-Insulator Transition journal, January 2011

Variation of the in-plane penetration depth λ ab as a function of doping in La 2 − x Sr x CuO 4 ± δ thin films on SrTiO 3 : Implications for the overdoped state journal, September 1996

Dependence of the critical temperature in overdoped copper oxides on superfluid density journal, August 2016

Microwave spectroscopy of thermally excited quasiparticles in YBa 2 Cu 3 O 6.99 journal, July 1999

Superconductivity in Bad Metals journal, April 1995

Superconductor-to-metal quantum phase transition in overdoped La 2 − x Sr x CuO 4 journal, April 2011

Nodal Quasiparticle Lifetime in the Superconducting State of Bi 2 Sr 2 CaCu 2 O 8 + δ journal, September 2000

Temporal correlations of superconductivity above the transition temperature in La2−xSrxCuO4 probed by terahertz spectroscopy journal, February 2011

Weak-coupling d -wave BCS superconductivity and unpaired electrons in overdoped La 2 − x Sr x Cu O 4 single crystals journal, August 2007

On the possibility of fast vortices in the cuprates: A vortex plasma model analysis of THz conductivity and diamagnetism in La 2 − x Sr x CuO 4 journal, September 2011

Observability of Quantum Phase Fluctuations in Cuprate Superconductors journal, April 2001

In-plane optical conductivity of La 2 − x Sr x Cu O 4 : Reduced superconducting condensate and residual Drude-like response journal, March 2005

Superfluid response in monolayer high- T c cuprates journal, June 2003

Superfluid Density in a Highly Underdoped YBa 2 Cu 3 O 6 + y Superconductor journal, December 2007

Importance of phase fluctuations in superconductors with small superfluid density journal, March 1995

Quantum oscillations in an overdoped high-Tc superconductor journal, October 2008

Observability of Quantum Phase Fluctuations in Cuprate Superconductors text, January 2001

Optical conductivity of overdoped cuprate superconductors: application to LSCO text, January 2018

Observability of quantum phase fluctuations in cuprate superconductors text, January 2000

Superfluid response in monolayer high-Tc cuprates text, January 2003

Impurity-Induced Quasiparticle Transport and Universal Limit Wiedemann-Franz Violation in d-Wave Superconductors text, January 1999

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Title: Locating the Missing Superconducting Electrons in the Overdoped Cuprates ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ [Locating the Missing Superconducting Electrons in Overdoped Cuprates]

Onset of Global Phase Coherence in Josephson-Junction Arrays: A Dissipative Phase Transition
journal, May 1986

Anomalously sharp superconducting transitions in overdoped ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$ films
journal, December 2010

d -wave superconductor as a model of high- $T_{c}$ superconductors
journal, January 1994

Microwave conductivity of d -wave superconductors
journal, November 1993

Effect of strong scattering on the low-temperature penetration depth of a d -wave superconductor
journal, August 1993

Fermi Surface and Quasiparticle Excitations of Overdoped ${Tl}_{2} {Ba}_{2} {CuO}_{6 + δ}$
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Phase-fluctuating superconductivity in overdoped La2−xSrxCuO4
journal, March 2011

Optical conductivity of overdoped cuprate superconductors: Application to ${La}_{2 - x} {Sr}_{x} {CuO}_{4}$
journal, August 2018

Muon spin rotation study of the correlation between $T_{c}$ and $n_{s}$ / $m^{*}$ in overdoped ${Tl}_{2}$ ${Ba}_{2}$ ${CuO}_{6 + δ}$
journal, September 1993

Impurity-induced quasiparticle transport and universal-limit Wiedemann-Franz violation in d -wave superconductors
journal, July 2000

Phase fluctuations, dissipation, and superfluid stiffness in d -wave superconductors
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From quantum matter to high-temperature superconductivity in copper oxides
journal, February 2015

Low-temperature AC conductivity of Bi2Sr2CaCu2O8+δ
journal, May 2000

Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8+delta
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Vanishing of phase coherence in underdoped Bi2Sr2CaCu2O8+δ
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Magnetic-field penetration depth in TI2Ba2CuO6+δ in the overdoped regime
journal, August 1993

Disorder and superfluid density in overdoped cuprate superconductors
journal, July 2017

Superconductivity and the c Axis Spectral Weight of High-Tc Superconductors
journal, August 1999

Phase Fluctuations in a Strongly Disordered $s$ -Wave NbN Superconductor Close to the Metal-Insulator Transition
journal, January 2011

Variation of the in-plane penetration depth $λ_{ab}$ as a function of doping in ${La}_{2 - x}$ ${Sr}_{x}$ ${CuO}_{4 \pm δ}$ thin films on ${SrTiO}_{3}$ : Implications for the overdoped state
journal, September 1996

Dependence of the critical temperature in overdoped copper oxides on superfluid density
journal, August 2016

Microwave spectroscopy of thermally excited quasiparticles in ${YBa}_{2} {Cu}_{3} O_{6.99}$
journal, July 1999

Superconductivity in Bad Metals
journal, April 1995

Superconductor-to-metal quantum phase transition in overdoped La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$
journal, April 2011

Nodal Quasiparticle Lifetime in the Superconducting State of ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$
journal, September 2000

Temporal correlations of superconductivity above the transition temperature in La2−xSrxCuO4 probed by terahertz spectroscopy
journal, February 2011

Weak-coupling $d$ -wave BCS superconductivity and unpaired electrons in overdoped ${La}_{2 - x} {Sr}_{x} Cu O_{4}$ single crystals
journal, August 2007

On the possibility of fast vortices in the cuprates: A vortex plasma model analysis of THz conductivity and diamagnetism in La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$
journal, September 2011

Observability of Quantum Phase Fluctuations in Cuprate Superconductors
journal, April 2001

In-plane optical conductivity of ${La}_{2 - x} {Sr}_{x} Cu O_{4}$ : Reduced superconducting condensate and residual Drude-like response
journal, March 2005

Superfluid response in monolayer high- $T_{c}$ cuprates
journal, June 2003

Superfluid Density in a Highly Underdoped ${YBa}_{2} {Cu}_{3} O_{6 + y}$ Superconductor
journal, December 2007

Importance of phase fluctuations in superconductors with small superfluid density
journal, March 1995

Quantum oscillations in an overdoped high-Tc superconductor
journal, October 2008

Observability of Quantum Phase Fluctuations in Cuprate Superconductors
text, January 2001

Optical conductivity of overdoped cuprate superconductors: application to LSCO
text, January 2018

Observability of quantum phase fluctuations in cuprate superconductors
text, January 2000

Superfluid response in monolayer high-Tc cuprates
text, January 2003

Impurity-Induced Quasiparticle Transport and Universal Limit Wiedemann-Franz Violation in d-Wave Superconductors
text, January 1999

The Quest for High(er) Tc in BaBiO3-Based Heterostructures
journal, November 2019

Parabolic Scaling in Overdoped Cuprate: a Statistical Field Theory Approach
journal, January 2020

Superfluid stiffness in cuprates: Effect of Mott transition and phase competition
journal, September 2019

Impact of electron-electron interactions on the superfluid density of dirty superconductors
journal, May 2019

Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film
journal, December 2019

Scaling between Superfluid Density and Tc in Overdoped La2−xSrxCuO4 Films
journal, June 2019

Parabolic scaling in overdoped cuprate: a statistical field theory approach
text, January 2019