Specific heat in strongly hole-doped iron-based superconductors

Chichinadze, Dmitry V.; Chubukov, Andrey V.

doi:10.1103/physrevb.99.024509

Title: Specific heat in strongly hole-doped iron-based superconductors

Abstract

We compute specific heat C(T) in a strongly hole-doped Fe-based superconductor, like KFe₂As₂, which has only hole pockets. We model the electronic structure by a three-orbital/three-pocket model with two smaller hole pockets made out of d_xz and d_yz orbitals and a larger pocket made out of d_xy orbital. We use as an input the experimental fact that the mass of d_xy fermion is several times heavier than that of d_xz/d_yz fermions. We argue that the heavy d_xy band gives the largest contribution to the specific heat in the normal state, but the superconducting gap on the d_xy pocket is much smaller than that on d_xz/d_yz pockets. We argue that in this situation the jump of C(T) at T_c is determined by d_xz/d_yz fermions, and the ratio (C_s–C_n)/C_n is a fraction of that in a one-band BCS superconductor. At T < T_c,C(T) remains relatively flat down to some T*, below which it rapidly drops. This behavior is consistent with the data for KFe₂As₂ and related materials. We use one-parameter model for the interactions and fix this only parameter by matching the experimental ratio of the gaps on the two d_xz/d_yz pockets. Furthermore, we argue that the resulting parameter-free model reproduces quantitativelymore »« less

Authors:

Chichinadze, Dmitry V. ^[1]; Chubukov, Andrey V. ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)

Publication Date:: Tue Jan 22 00:00:00 EST 2019

Research Org.:: Univ. of Minnesota, Minneapolis, MN (United States)

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

OSTI Identifier:: 1612172

Alternate Identifier(s):: OSTI ID: 1491618

Grant/Contract Number:: SC0014402

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B

Additional Journal Information:: Journal Volume: 99; Journal Issue: 2; 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; Materials Science; Physics; Multiband superconductivity

Citation Formats


                    Chichinadze, Dmitry V., and Chubukov, Andrey V. Specific heat in strongly hole-doped iron-based superconductors.  United States: N. p., 2019. 
Web.  doi:10.1103/physrevb.99.024509.

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                    Chichinadze, Dmitry V., & Chubukov, Andrey V. Specific heat in strongly hole-doped iron-based superconductors.  United States.  https://doi.org/10.1103/physrevb.99.024509

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                    Chichinadze, Dmitry V., and Chubukov, Andrey V. Tue .  
"Specific heat in strongly hole-doped iron-based superconductors".  United States.  https://doi.org/10.1103/physrevb.99.024509.  https://www.osti.gov/servlets/purl/1612172.

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@article{osti_1612172,

  title        = {Specific heat in strongly hole-doped iron-based superconductors},

  author       = {Chichinadze, Dmitry V. and Chubukov, Andrey V.},

  abstractNote = {We compute specific heat C(T) in a strongly hole-doped Fe-based superconductor, like KFe2As2, which has only hole pockets. We model the electronic structure by a three-orbital/three-pocket model with two smaller hole pockets made out of dxz and dyz orbitals and a larger pocket made out of dxy orbital. We use as an input the experimental fact that the mass of dxy fermion is several times heavier than that of dxz/dyz fermions. We argue that the heavy dxy band gives the largest contribution to the specific heat in the normal state, but the superconducting gap on the dxy pocket is much smaller than that on dxz/dyz pockets. We argue that in this situation the jump of C(T) at Tc is determined by dxz/dyz fermions, and the ratio (Cs–Cn)/Cn is a fraction of that in a one-band BCS superconductor. At T < Tc,C(T) remains relatively flat down to some T*, below which it rapidly drops. This behavior is consistent with the data for KFe2As2 and related materials. We use one-parameter model for the interactions and fix this only parameter by matching the experimental ratio of the gaps on the two dxz/dyz pockets. Furthermore, we argue that the resulting parameter-free model reproduces quantitatively the data on C(T) for KFe2As2. We further argue that the very existence of a finite T* < Tc favors s+– gap structure over d-wave, because in the latter case T* would almost vanish.},

  doi          = {10.1103/physrevb.99.024509},

  journal      = {Physical Review. B},

  number       = 2,

  volume       = 99,

  place        = {United States},

  year         = {Tue Jan 22 00:00:00 EST 2019},

  month        = {Tue Jan 22 00:00:00 EST 2019}

}

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Title: Specific heat in strongly hole-doped iron-based superconductors

Abstract

Citation Formats

Materials and Novel Superconductivity in Iron Pnictide Superconductors journal, March 2011

Electronic specific heat of Ba 1 − x K x Fe 2 As 2 from 2 to 380 K journal, October 2013

Evidence for excluding the possibility of d -wave superconducting-gap symmetry in Ba-doped KFe 2 As 2 journal, February 2014

Superconducting specific-heat jump Δ C el ∝ T c β ( β ≈ 2 ) for K 1 − x Na x Fe 2 As 2 journal, February 2014

Selective Mott Physics as a Key to Iron Superconductors journal, April 2014

Exotic d -Wave Superconducting State of Strongly Hole-Doped K x Ba 1 − x Fe 2 As 2 journal, September 2011

Superconductivity gets an iron boost journal, March 2010

To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report journal, June 2009

Extraordinary Doping Effects on Quasiparticle Scattering and Bandwidth in Iron-Based Superconductors journal, September 2014

Interplay between Magnetism, Superconductivity, and Orbital Order in 5-Pocket Model for Iron-Based Superconductors: Parquet Renormalization Group Study journal, January 2017

Pairing Mechanism in Fe-Based Superconductors journal, March 2012

Sudden reversal in the pressure dependence of Tc in the iron-based superconductor KFe2As2 journal, May 2013

Manifesto for a higher Tc journal, April 2011

Scaling of the superconducting gap with orbital character in FeSe journal, November 2018

Specific heat and upper critical fields in KFe 2 As 2 single crystals journal, April 2012

Hund Interaction, Spin-Orbit Coupling, and the Mechanism of Superconductivity in Strongly Hole-Doped Iron Pnictides journal, February 2017

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides journal, September 2011

Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe 2 As 2 single crystals journal, December 2012

Orbital order in FeSe: The case for vertex renormalization journal, July 2018

Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe 2 As 2 journal, July 2009

Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides journal, February 2009

Magnetic interactions in iron superconductors: A review journal, January 2016

Specific heat of MgB 2 in a one- and a two-band model from first-principles calculations journal, January 2002

Gap symmetry in KFe 2 As 2 and the cos 4 θ gap component in LiFeAs journal, January 2012

Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides journal, July 2009

Fermi Surface and Mass Enhancement in KFe 2 As 2 from de Haas–van Alphen Effect Measurements journal, May 2010

Strong Correlations from Hund’s Coupling journal, April 2013

High-temperature superconductivity in iron-based materials journal, August 2010

Superconductivity in iron compounds journal, December 2011

Evidence of d -wave superconductivity in K 1 − x Na x Fe 2 As 2 ( x = 0 , 0.1 ) single crystals from low-temperature specific-heat measurements journal, May 2013

What drives nematic order in iron-based superconductors? journal, January 2014

Fermi surface of Ba1−xKxFe2As2 as probed by angle-resolved photoemission journal, May 2009

Mass Enhancements and Band Shifts in Strongly Hole-Overdoped Fe-Based Pnictide Superconductors: KFe2As2 and CsFe2As2 journal, January 2018

Magnetism, Superconductivity, and Spontaneous Orbital Order in Iron-Based Superconductors: Which Comes First and Why? journal, December 2016

Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe 2 As 2 journal, July 2013

Electronic band structure and momentum dependence of the superconducting gap in Ca 1 − x Na x Fe 2 As 2 from angle-resolved photoemission spectroscopy journal, March 2013

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Gap symmetry and structure of Fe-based superconductors journal, October 2011

Iron-based superconductors, seven years later journal, June 2015

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides journal, October 2010

Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2 journal, September 2012

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journal, October 2013

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Extraordinary Doping Effects on Quasiparticle Scattering and Bandwidth in Iron-Based Superconductors
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Interplay between Magnetism, Superconductivity, and Orbital Order in 5-Pocket Model for Iron-Based Superconductors: Parquet Renormalization Group Study
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Pairing Mechanism in Fe-Based Superconductors
journal, March 2012

Sudden reversal in the pressure dependence of Tc in the iron-based superconductor KFe2As2
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Manifesto for a higher Tc
journal, April 2011

Scaling of the superconducting gap with orbital character in FeSe
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Specific heat and upper critical fields in KFe $_{2}$ As $_{2}$ single crystals
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Hund Interaction, Spin-Orbit Coupling, and the Mechanism of Superconductivity in Strongly Hole-Doped Iron Pnictides
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Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
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Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe $_{2}$ As $_{2}$ single crystals
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Orbital order in FeSe: The case for vertex renormalization
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Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor ${KFe}_{2} {As}_{2}$
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Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides
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Specific heat of MgB ₂ in a one- and a two-band model from first-principles calculations
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Gap symmetry in KFe $_{2}$ As $_{2}$ and the $\cos$ 4 $θ$ gap component in LiFeAs
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Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides
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Fermi Surface and Mass Enhancement in KFe ₂ As ₂ from de Haas–van Alphen Effect Measurements
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Strong Correlations from Hund’s Coupling
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Superconductivity in iron compounds
journal, December 2011

Evidence of $d$ -wave superconductivity in K $_{1 - x}$ Na $_{x}$ Fe $_{2}$ As $_{2}$ ( $x = 0, 0.1$ ) single crystals from low-temperature specific-heat measurements
journal, May 2013

What drives nematic order in iron-based superconductors?
journal, January 2014

Fermi surface of Ba1−xKxFe2As2 as probed by angle-resolved photoemission
journal, May 2009

Mass Enhancements and Band Shifts in Strongly Hole-Overdoped Fe-Based Pnictide Superconductors: KFe2As2 and CsFe2As2
journal, January 2018

Magnetism, Superconductivity, and Spontaneous Orbital Order in Iron-Based Superconductors: Which Comes First and Why?
journal, December 2016

Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor ${KFe}_{2} {As}_{2}$
journal, July 2013

Electronic band structure and momentum dependence of the superconducting gap in Ca $_{1 - x}$ Na $_{x}$ Fe $_{2}$ As $_{2}$ from angle-resolved photoemission spectroscopy
journal, March 2013

Specific heat in KFe $_{2}$ As $_{2}$ in zero and applied magnetic field
journal, May 2011

Gap symmetry and structure of Fe-based superconductors
journal, October 2011

Iron-based superconductors, seven years later
journal, June 2015

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010

Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2
journal, September 2012

Multiband Superconductivity in KFe ₂ As ₂ : Evidence for One Isotropic and Several Lilliputian Energy Gaps
journal, January 2014

Strain-Driven Approach to Quantum Criticality in $A {Fe}_{2} {As}_{2}$ with $A = K$ , Rb, and Cs
journal, June 2016