Dependence of the absolute value of the penetration depth in (Ba1–xKx)Fe2As2 on doping

Almoalem, Avior; Yagil, Alon; Cho, Kyuil; Teknowijoyo, Serafim; Tanatar, Makariy A.; Prozorov, Ruslan; Liu, Yong; Lograsso, Thomas A.; Auslaender, Ophir M.

doi:10.1103/PhysRevB.98.054516

Title: Dependence of the absolute value of the penetration depth in $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$ on doping

Abstract

Here, we report magnetic force microscopy (MFM) measurements on the iron-based superconductor Ba_1–xK_xFe₂As₂. By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth (λ_ab) in underdoped, optimally doped, and overdoped samples. The results suggest an abrupt increase of λ_ab as doping is increased from x_opt, which is potentially related to the presence of a quantum critical point. The response of superconducting vortices to magnetic forces exerted by the MFM tip for x = 0.19 and 0.58 is compatible with previously observed structural symmetries at those doping levels.

Authors:

Almoalem, Avior ^[1]; Yagil, Alon ^[1]; Cho, Kyuil ^[2]; Teknowijoyo, Serafim ^[2]; Tanatar, Makariy A. ^[2]; Prozorov, Ruslan ^[2]; Liu, Yong ^[3]; Lograsso, Thomas A. ^[2]; Auslaender, Ophir M. ^[1]

Technion–Israel Institute of Technology, Haifa (Israel)
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab., Ames, IA (United States)

Publication Date:: Mon Aug 27 00:00:00 EDT 2018

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

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

OSTI Identifier:: 1471219

Alternate Identifier(s):: OSTI ID: 1466861

Report Number(s):: IS-J-9720
Journal ID: ISSN 2469-9950; PRBMDO

Grant/Contract Number:: 1897/14; AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Almoalem, Avior, Yagil, Alon, Cho, Kyuil, Teknowijoyo, Serafim, Tanatar, Makariy A., Prozorov, Ruslan, Liu, Yong, Lograsso, Thomas A., and Auslaender, Ophir M. Dependence of the absolute value of the penetration depth in (Ba1–xKx)Fe2As2 on doping.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevB.98.054516.

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                    Almoalem, Avior, Yagil, Alon, Cho, Kyuil, Teknowijoyo, Serafim, Tanatar, Makariy A., Prozorov, Ruslan, Liu, Yong, Lograsso, Thomas A., & Auslaender, Ophir M. Dependence of the absolute value of the penetration depth in (Ba1–xKx)Fe2As2 on doping.  United States.  https://doi.org/10.1103/PhysRevB.98.054516

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                    Almoalem, Avior, Yagil, Alon, Cho, Kyuil, Teknowijoyo, Serafim, Tanatar, Makariy A., Prozorov, Ruslan, Liu, Yong, Lograsso, Thomas A., and Auslaender, Ophir M. Mon .  
"Dependence of the absolute value of the penetration depth in (Ba1–xKx)Fe2As2 on doping".  United States.  https://doi.org/10.1103/PhysRevB.98.054516.  https://www.osti.gov/servlets/purl/1471219.

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@article{osti_1471219,

  title        = {Dependence of the absolute value of the penetration depth in (Ba1–xKx)Fe2As2 on doping},

  author       = {Almoalem, Avior and Yagil, Alon and Cho, Kyuil and Teknowijoyo, Serafim and Tanatar, Makariy A. and Prozorov, Ruslan and Liu, Yong and Lograsso, Thomas A. and Auslaender, Ophir M.},

  abstractNote = {Here, we report magnetic force microscopy (MFM) measurements on the iron-based superconductor Ba1–xKxFe2As2. By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth (λab) in underdoped, optimally doped, and overdoped samples. The results suggest an abrupt increase of λab as doping is increased from xopt, which is potentially related to the presence of a quantum critical point. The response of superconducting vortices to magnetic forces exerted by the MFM tip for x = 0.19 and 0.58 is compatible with previously observed structural symmetries at those doping levels.},

  doi          = {10.1103/PhysRevB.98.054516},

  journal      = {Physical Review B},

  number       = 5,

  volume       = 98,

  place        = {United States},

  year         = {Mon Aug 27 00:00:00 EDT 2018},

  month        = {Mon Aug 27 00:00:00 EDT 2018}

}

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Here, controlled pointlike disorder introduced by 2.5-MeV electron irradiation was used to probe the superconducting state of single crystals of CaK(Fe_1–xNi_x)₄As₄ superconductor at x = 0 and 0.05 doping levels. Both compositions show an increase of the residual resistivity and a decrease of the superconducting transition temperature, T_c, at the rate of dT_c/dρ(T_c) ≈ 0.19 K/(μΩcm) for x = 0 and 0.38 K/(μΩcm) for x = 0.05, respectively. In the Ni-doped compound (x = 0.05), the coexisting spin-vortex crystal (SVC) magnetic phase is suppressed at the rate of dT_N/dρ(T_N) ≈ 0.16 K/(μΩcm). The low-temperature variation of London penetration depth ismore »« less
Cited by 14
https://doi.org/10.1103/PhysRevB.97.140508

Full Text Available
Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Journal Article Gordon, R. T. ; Kim, H. ; Salovich, N. ; ... - Physical Review. B, Condensed Matter and Materials Physics

The zero-temperature value of the in-plane London penetration depth, λ a b ( 0 ) , has been measured in single crystals of Ba ( Fe 1 - x Co x ) 2 As 2 as a function of the Co concentration, x , across both the underdoped and overdoped superconducting regions of the phase diagram. For x ≳ 0.047 , λ a b ( 0 ) has been found to have values between 120 ± 50 and 300 ± 50 nm . A pronounced increase in λ a b ( 0 ) , to a value as high asmore »« less
https://doi.org/10.1103/PhysRevB.82.054507
${}^{77}{Se}$ NMR investigation of the $K_{x}$ Fe $_{2 - y}$ Se $_{2}$ high- $T_{c}$ superconductor ( $T_{c} = 33$ K)

Journal Article Torchetti, D. A. ; Fu, M. ; Christensen, D. C. ; ... - Physical Review. B, Condensed Matter and Materials Physics

We report comprehensive 77 Se NMR measurements on a single crystalline sample of the recently discovered FeSe-based high-temperature superconductor K x Fe 2 - y Se 2 ( T c = 33 K) in a broad temperature range up to 290 K. Despite deviations from the stoichiometric KFe 2 Se 2 composition, we observed 77 Se NMR line shapes as narrow as 4.5 kHz under a magnetic field applied along the crystal c axis, and found no evidence for co-existence of magnetic order with superconductivity. On the other hand, the 77 Se NMR line shape splits into two peaks withmore »« less
https://doi.org/10.1103/PhysRevB.83.104508
Experimental elucidation of the origin of the ‘double spin resonances’ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Journal Article Wang, Meng ; Yi, M. ; Sun, H. L. ; ... - Physical Review B

We report a combined study of the spin resonances and superconducting gaps for underdoped ( T _c = 19 K), optimally doped (T_c = 25 K), and overdoped (T_c = 19 K) Ba (Fe_{1 - x}Co _x) ₂ As ₂ single crystals with inelastic neutron scattering and angle resolved photoemission spectroscopy. We also find a quasi-two-dimensional spin resonance whose energy scales with the superconducting gap in all three compounds. In addition, anisotropic low energy spin excitation enhancements in the superconducting state have been deduced and characterized for the under and optimally doped compounds. Our data suggest that the quasi-two-dimensionalmore »« less
Cited by 12
https://doi.org/10.1103/PhysRevB.93.205149

Full Text Available

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Title: Dependence of the absolute value of the penetration depth in ( Ba 1 – x K x ) Fe 2 As 2 on doping

Abstract

Citation Formats

Doping evolution of the superconducting gap structure in the underdoped iron arsenide Ba 1 − x K x Fe 2 As 2 revealed by thermal conductivity journal, June 2016

Disorder-induced power-law response of a superconducting vortex on a plane journal, September 2015

Lifshitz Transition and Chemical Instabilities in Ba 1 − x K x Fe 2 As 2 Superconductors journal, April 2014

Vortex images on Ba 1 − x K x Fe 2 As 2 observed directly by magnetic force microscopy journal, January 2012

Two-Gap Superconductivity in Ba 1 − x K x Fe 2 As 2 : A Complementary Study of the Magnetic Penetration Depth by Muon-Spin Rotation and Angle-Resolved Photoemission journal, May 2009

Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba 1 − x K x Fe 2 As 2 journal, February 2017

A Quantum Critical Point Lying Beneath the Superconducting Dome in Iron Pnictides journal, March 2014

Abrupt change in the energy gap of superconducting Ba 1 − x K x Fe 2 As 2 single crystals with hole doping journal, October 2012

Different response of the crystal structure to isoelectronic doping in BaFe 2 ( As 1 − x P x ) 2 and ( Ba 1 − x Sr x ) Fe 2 As 2 journal, July 2010

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped Ba ( Fe 0.953 Co 0.047 ) 2 As 2 Compound Using X-ray and Neutron Scattering Techniques journal, August 2009

Magnetic penetration depth in unconventional superconductors journal, June 2006

Apparent violation of the conductivity sum rule in certain superconductors journal, September 1992

Strong correlations, strong coupling, and s -wave superconductivity in hole-doped BaFe 2 As 2 single crystals journal, November 2016

Evidence of a Spin Resonance Mode in the Iron-Based Superconductor Ba 0.6 K 0.4 Fe 2 As 2 from Scanning Tunneling Spectroscopy journal, May 2012

Energy gap evolution across the superconductivity dome in single crystals of (Ba 1− x K x )Fe 2 As 2 journal, September 2016

London penetration depth and strong pair breaking in iron-based superconductors journal, May 2010

Gradual suppression of antiferromagnetism in BaFe 2 (As 1 − x P x ) 2 : Zero-temperature evidence for a quantum critical point journal, May 2012

Superfluid density and specific heat within a self-consistent scheme for a two-band superconductor journal, July 2009

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe 2 (As 1- x P x ) 2 journal, March 2012

Mechanics of individual isolated vortices in a cuprate superconductor journal, November 2008

Structural and Magnetic Phase Transitions near Optimal Superconductivity in BaFe 2 ( As 1 − x P x ) 2 journal, April 2015

Anomalous Suppression of the Orthorhombic Lattice Distortion in Superconducting Ba ( Fe 1 − x Co x ) 2 As 2 Single Crystals journal, February 2010

Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba 1 − x K x Fe 2 As 2 journal, July 2014

Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor Ba 1 − x K x Fe 2 As 2 journal, March 2009

How Many Quantum Phase Transitions Exist Inside the Superconducting Dome of the Iron Pnictides? journal, July 2013

Local Measurement of the Superfluid Density in the Pnictide Superconductor Ba ( Fe 1 − x Co x ) 2 As 2 across the Superconducting Dome journal, February 2011

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2 journal, June 2012

Doping dependence of Hall coefficient and evolution of coherent electronic state in the normal state of the Fe-based superconductor Ba 1 − x K x Fe 2 As 2 journal, February 2012

Enhancement of the London Penetration Depth in Pnictides at the Onset of Spin-Density-Wave Order under Superconducting Dome journal, April 2013

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2 journal, July 2015

Controlled manipulation of individual vortices in a superconductor journal, October 2008

Local measurement of the penetration depth in the pnictide superconductor Ba ( Fe 0.95 Co 0.05 ) 2 As 2 journal, March 2010

Effect of Magnetic Criticality and Fermi-Surface Topology on the Magnetic Penetration Depth journal, October 2013

Nonexponential London penetration depth of external magnetic fields in superconducting Ba 1 − x K x Fe 2 As 2 single crystals journal, July 2009

Local characterization of superconductivity in BaF e 2 ( A s 1 − x P x ) 2 journal, February 2015

Superconducting state coexisting with a phase-separated static magnetic order in ( Ba , K ) Fe 2 As 2 , ( Sr , Na ) Fe 2 As 2 , and CaFe 2 As 2 journal, July 2009

Diamagnetic vortex barrier stripes in underdoped BaFe 2 ( As 1 − x P x ) 2 journal, August 2016

Single-vortex pinning and penetration depth in superconducting NdFeAsO 1 − x F x journal, October 2015

Superconductivity at 38 K in the Iron Arsenide ( Ba 1 − x K x ) Fe 2 As 2 journal, September 2008

Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba ( Fe 1 − x Co x ) 2 As 2 journal, August 2010

Frequency modulation detection using high‐ Q cantilevers for enhanced force microscope sensitivity journal, January 1991

Effects of electron irradiation on resistivity and London penetration depth of Ba 1 − x K x Fe 2 As 2 ( x ≤ 0.34 ) iron-pnictide superconductor journal, September 2014

Singularity of the London Penetration Depth at Quantum Critical Points in Superconductors journal, October 2013

Low temperature specific heat of the hole-doped Ba 0.6 K 0.4 Fe 2 As 2 single crystals journal, May 2009

Behavior of vortices near twin boundaries in underdoped Ba(Fe 1 − x Co x ) 2 As 2 journal, February 2011

Magnetic Penetration Depth in the FeAs-Based Superconductor KFe 2 As 2 journal, January 2012

Electronic nematicity above the structural and superconducting transition in BaFe2(As1−xP x )2 journal, June 2012

Microscopic Coexistence of Superconductivity and Magnetism in Ba 1 − x K x Fe 2 As 2 journal, November 2011

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba 1 − x K x Fe 2 As 2 journal, July 2015

Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba 0.1 K 0.9 Fe 2 As 2 journal, December 2013

Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal, September 2008

Phase transition beneath the superconducting dome in BaFe 2 ( As 1 − x P x ) 2 journal, August 2015

Superconductivity near a Quantum-Critical Point: The Special Role of the First Matsubara Frequency journal, October 2016

Thermodynamic phase diagram, phase competition, and uniaxial pressure effects in BaFe 2 (As 1 − x P x ) 2 studied by thermal expansion journal, September 2012

Magnetoelastic coupling in the phase diagram of Ba 1 − x K x Fe 2 As 2 as seen via neutron diffraction journal, May 2011

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba 1 − x K x )Fe 2 As 2 ( 0.22 ≤ x ≤ 1 ) journal, April 2014

Magnetic Penetration Depth in Unconventional Superconductors journal, January 2007

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2 text, January 2021

Controlled Manipulation of Individual Vortices in a Superconductor text, January 2008

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2) text, January 2008

Superfluid density and specific heat within self-consistent scheme for two-band superconductor text, January 2009

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe$_2$(As$_{1-x}$P$_x$)$_2$ text, January 2011

Quantum critical point lying beneath the superconducting dome in iron-pnictides text, January 2013

Effect of magnetic criticality and Fermi-surface topology on the magnetic penetration depth text, January 2013

How many quantum phase transitions exist inside the superconducting dome of the iron pnictides? text, January 2013

Disorder induced power-law response of a superconducting vortex on a plane text, January 2014

Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO$_{1-x}$F$_x$ text, January 2015

Energy Gap Evolution Across the Superconductivity Dome in Single Crystals of (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$ text, January 2016

Magnetic Penetration Depth in Unconventional Superconductors text, January 2006

Analysis of the London penetration depth in Ni-doped CaKFe 4 As 4 journal, September 2019

Title: Dependence of the absolute value of the penetration depth in $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$ on doping

Doping evolution of the superconducting gap structure in the underdoped iron arsenide ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ revealed by thermal conductivity
journal, June 2016

Disorder-induced power-law response of a superconducting vortex on a plane
journal, September 2015

Lifshitz Transition and Chemical Instabilities in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ Superconductors
journal, April 2014

Vortex images on Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ observed directly by magnetic force microscopy
journal, January 2012

Two-Gap Superconductivity in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ : A Complementary Study of the Magnetic Penetration Depth by Muon-Spin Rotation and Angle-Resolved Photoemission
journal, May 2009

Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, February 2017

A Quantum Critical Point Lying Beneath the Superconducting Dome in Iron Pnictides
journal, March 2014

Abrupt change in the energy gap of superconducting Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ single crystals with hole doping
journal, October 2012

Different response of the crystal structure to isoelectronic doping in ${BaFe}_{2} {({As}_{1 - x} P_{x})}_{2}$ and $({Ba}_{1 - x} {Sr}_{x}) {Fe}_{2} {As}_{2}$
journal, July 2010

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped $Ba ({Fe}_{0.953} {Co}_{0.047})_{2} {As}_{2}$ Compound Using X-ray and Neutron Scattering Techniques
journal, August 2009

Magnetic penetration depth in unconventional superconductors
journal, June 2006

Apparent violation of the conductivity sum rule in certain superconductors
journal, September 1992

Strong correlations, strong coupling, and $s$ -wave superconductivity in hole-doped ${BaFe}_{2} {As}_{2}$ single crystals
journal, November 2016

Evidence of a Spin Resonance Mode in the Iron-Based Superconductor ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$ from Scanning Tunneling Spectroscopy
journal, May 2012

Energy gap evolution across the superconductivity dome in single crystals of (Ba _{1− x} K _x )Fe ₂ As ₂
journal, September 2016

London penetration depth and strong pair breaking in iron-based superconductors
journal, May 2010

Gradual suppression of antiferromagnetism in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ : Zero-temperature evidence for a quantum critical point
journal, May 2012

Superfluid density and specific heat within a self-consistent scheme for a two-band superconductor
journal, July 2009

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe ₂ (As _{1- x} P _x ) ₂
journal, March 2012

Mechanics of individual isolated vortices in a cuprate superconductor
journal, November 2008

Structural and Magnetic Phase Transitions near Optimal Superconductivity in ${{BaFe}_{2} ({As}_{1 - x} P_{x})}_{2}$
journal, April 2015

Anomalous Suppression of the Orthorhombic Lattice Distortion in Superconducting $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$ Single Crystals
journal, February 2010

Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped ${Ba}_{1 - x}$ $K_{x}$ ${Fe}_{2}$ ${As}_{2}$
journal, July 2014

Electronic Phase Separation in the Slightly Underdoped Iron Pnictide Superconductor ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, March 2009

How Many Quantum Phase Transitions Exist Inside the Superconducting Dome of the Iron Pnictides?
journal, July 2013

Local Measurement of the Superfluid Density in the Pnictide Superconductor $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$ across the Superconducting Dome
journal, February 2011

A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
journal, June 2012

Doping dependence of Hall coefficient and evolution of coherent electronic state in the normal state of the Fe-based superconductor Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$
journal, February 2012

Enhancement of the London Penetration Depth in Pnictides at the Onset of Spin-Density-Wave Order under Superconducting Dome
journal, April 2013

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2
journal, July 2015

Controlled manipulation of individual vortices in a superconductor
journal, October 2008

Local measurement of the penetration depth in the pnictide superconductor $Ba {({Fe}_{0.95} {Co}_{0.05})}_{2} {As}_{2}$
journal, March 2010

Effect of Magnetic Criticality and Fermi-Surface Topology on the Magnetic Penetration Depth
journal, October 2013

Nonexponential London penetration depth of external magnetic fields in superconducting ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ single crystals
journal, July 2009

Local characterization of superconductivity in $BaF e_{2} {(A s_{1 - x} P_{x})}_{2}$
journal, February 2015

Superconducting state coexisting with a phase-separated static magnetic order in $(Ba, K) {Fe}_{2} {As}_{2}$ , $(Sr, Na) {Fe}_{2} {As}_{2}$ , and ${CaFe}_{2} {As}_{2}$
journal, July 2009

Diamagnetic vortex barrier stripes in underdoped ${BaFe}_{2} {({As}_{1 - x} P_{x})}_{2}$
journal, August 2016

Single-vortex pinning and penetration depth in superconducting ${NdFeAsO}_{1 - x} F_{x}$
journal, October 2015

Superconductivity at 38 K in the Iron Arsenide $({Ba}_{1 - x} K_{x}) {Fe}_{2} {As}_{2}$
journal, September 2008

Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, August 2010

Frequency modulation detection using high‐ Q cantilevers for enhanced force microscope sensitivity
journal, January 1991

Effects of electron irradiation on resistivity and London penetration depth of ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2} (x \leq 0.34)$ iron-pnictide superconductor
journal, September 2014

Singularity of the London Penetration Depth at Quantum Critical Points in Superconductors
journal, October 2013

Low temperature specific heat of the hole-doped ${Ba}_{0.6} K_{0.4} {Fe}_{2} {As}_{2}$ single crystals
journal, May 2009

Behavior of vortices near twin boundaries in underdoped Ba(Fe $_{1 - x} {Co}_{x})_{2} {As}_{2}$
journal, February 2011

Magnetic Penetration Depth in the FeAs-Based Superconductor KFe ₂ As ₂
journal, January 2012

Electronic nematicity above the structural and superconducting transition in BaFe2(As1−xP x )2
journal, June 2012

Microscopic Coexistence of Superconductivity and Magnetism in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, November 2011

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, July 2015

Possible nodal superconducting gap and Lifshitz transition in heavily hole-doped Ba $_{0.1}$ K $_{0.9}$ Fe $_{2}$ As $_{2}$
journal, December 2013

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Phase transition beneath the superconducting dome in ${BaFe}_{2} {({As}_{1 - x} P_{x})}_{2}$
journal, August 2015

Superconductivity near a Quantum-Critical Point: The Special Role of the First Matsubara Frequency
journal, October 2016

Thermodynamic phase diagram, phase competition, and uniaxial pressure effects in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ studied by thermal expansion
journal, September 2012

Magnetoelastic coupling in the phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ as seen via neutron diffraction
journal, May 2011

Comprehensive scenario for single-crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba $_{1 - x}$ K $_{x}$ )Fe $_{2}$ As $_{2}$ ( $0.22 \leq x \leq 1$ )
journal, April 2014

Magnetic Penetration Depth in Unconventional Superconductors
journal, January 2007

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2
text, January 2021

Controlled Manipulation of Individual Vortices in a Superconductor
text, January 2008

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2)
text, January 2008

Superfluid density and specific heat within self-consistent scheme for two-band superconductor
text, January 2009

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe$_2$(As$_{1-x}$P$_x$)$_2$
text, January 2011

Quantum critical point lying beneath the superconducting dome in iron-pnictides
text, January 2013

Effect of magnetic criticality and Fermi-surface topology on the magnetic penetration depth
text, January 2013

How many quantum phase transitions exist inside the superconducting dome of the iron pnictides?
text, January 2013

Disorder induced power-law response of a superconducting vortex on a plane
text, January 2014

Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsO$_{1-x}$F$_x$
text, January 2015

Energy Gap Evolution Across the Superconductivity Dome in Single Crystals of (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$
text, January 2016

Magnetic Penetration Depth in Unconventional Superconductors
text, January 2006

Analysis of the London penetration depth in Ni-doped ${CaKFe}_{4} {As}_{4}$
journal, September 2019