P. Richard

activity

20082017

most citedUnconventional Anisotropic s-Wave Superconducting Gaps of LiFeAs Iron-Pnictide Superconductor

172 citations · 1.5k across the 28 of their papers we have counts for

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25 papers · 1 filter

cond-mat.supr-con2017★ 14 cited

Is BaCr $_{2}$ As $_{2}$ symmetrical to BaFe $_{2}$ As $_{2}$ with respect to half $3 d$ shell filling?

P. Richard, A. van Roekeghem, B. Q. Lv +7

We have performed an angle-resolved photoemission spectroscopy study of BaCr $_{2}$ As $_{2}$ , which has the same crystal structure as BaFe $_{2}$ As $_{2}$ , a parent compound of Fe-based superc…

cond-mat.supr-con2016★ 15 cited

Observation of non-Fermi liquid behavior in hole-doped LiFe $_{1 - x}$ V $_{x}$ As

L. Y. Xing, X. Shi, P. Richard +12

We synthesized a series of V-doped LiFe $_{1 - x}$ V $_{x}$ As single crystals. The superconducting transition temperature $T_{c}$ of LiFeAs decreases rapidly at a rate of 7 K per 1\% V. The…

cond-mat.supr-con2015★ 44 cited

Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with suppressed superconductivity in LiFe $_{1 - x}$ Co $_{x}$ As

Y. M. Dai, H. Miao, L. Y. Xing +12

A series of LiFe $_{1 - x}$ Co $_{x}$ As compounds with different Co concentrations have been studied by transport, optical spectroscopy, angle-resolved photoemission spectroscopy and nu…

cond-mat.supr-con2015★ 25 cited

Tuning electronic correlations in transition metal pnictides: chemistry beyond the valence count

E. Razzoli, C. E. Matt, M. Kobayashi +14

The effects of electron-electron correlations on the low-energy electronic structure and their relationship with unconventional superconductivity are central aspects in the researc…

cond-mat.supr-con2014★ 13 cited

Camelback-shaped band reconciles heavy electron behavior with weak electronic Coulomb correlations in superconducting TlNi2Se2

N. Xu, C. E. Matt, P. Richard +16

Using high-resolution photoemission spectroscopy and first-principles calculations, we characterize superconducting TlNi $_{2}$ Se $_{2}$ as a material with weak electronic Coulomb correl…

cond-mat.supr-con2014★ 20 cited

Observation of an electron band above the Fermi level in FeTe $_{0.55}$ Se $_{0.45}$ from \emph{in-situ} surface doping

P. Zhang, P. Richard, N. Xu +7

We used \emph{in-situ} potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe $_{0.55}$ Se $_{0.45}$ . The systematic study of the bands near the Fermi lev…

cond-mat.supr-con2014★ 22 cited

Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O

Junzhang Ma, Ambroise van Roekeghem, Pierre Richard +14

The electronic structure of the intercalated iron-based superconductor Ba2Ti2Fe2As4O (Tc - 21.5 K) has been investigated by using angle-resolved photoemission spectroscopy and comb…

cond-mat.supr-con2014★ 78 cited

Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs

H. Miao, T. Qian, X. Shi +8

In conventional BCS superconductors, the quantum condensation of superconducting electron pairs is understood as a Fermi surface (FS) instability, in which the low-energy electrons…

cond-mat.supr-con2014★ 41 cited

Evolution from incoherent to coherent electronic states and its implications to superconductivity in FeTe1-xSex

E. Ieki, K. Nakayama, Y. Miyata +14

We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex to elucidate the electronic states relevant to the sup…

cond-mat.supr-con2014★ 5 cited

Observation of strong-coupling pairing with weakened Fermi-surface nesting at optimal hole doping in Ca $_{0.33}$ Na $_{0.67}$ Fe $_{2}$ As $_{2}$

Y. -B. Shi, Y. -B. Huang, X. -P. Wang +12

We report an angle-resolved photoemission investigation of optimally-doped Ca $_{0.33}$ Na $_{0.67}$ Fe $_{2}$ As $_{2}$ . The Fermi surface topology of this compound is similar to that of the…

cond-mat.supr-con2013★ 2 cited

Observation of momentum-confined in-gap impurity state in Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$ : evidence for anti-phase $s_{\pm}$ pairing

P. Zhang, P. Richard, T. Qian +12

We report the observation by angle-resolved photoemission spectroscopy of an impurity state located inside the superconducting gap of Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$ and vanishing…

cond-mat.supr-con2013★ 32 cited

Coexistence of orbital degeneracy lifting and superconductivity in iron-based superconductors

H. Miao, L. -M. Wang, P. Richard +10

In contrast to conventional superconducting (SC) materials, superconductivity in high-temperature superconductors (HTCs) usually emerges in the presence of other fluctuating orders…

cond-mat.supr-con2013★ 91 cited

Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2

N. Xu, P. Richard, X. Shi +11

We performed a high energy resolution ARPES investigation of over-doped Ba0.1K0.9Fe2As2 with T_c= 9 K. The Fermi surface topology of this material is similar to that of KFe2As2 and…

cond-mat.supr-con2012★ 37 cited

Observation of an isotropic superconducting gap at the Brillouin zone center of Tl $_{0.63}$ K $_{0.37}$ Fe $_{1.78}$ Se $_{2}$

X. -P. Wang, P. Richard, A. van Roekeghem +10

We performed a high-resolution angle-resolved photoemission spectroscopy study on superconducting (SC) Tl $_{0.63}$ K $_{0.37}$ Fe $_{1.78}$ Se $_{2}$ ( $T_{c} = 29$ K) in the whole Brillouin zo…

cond-mat.supr-con2012★ 43 cited

Three-dimensionality and orbital characters of Fermi surface in (Tl,Rb) $_{y}$ Fe $_{2 - x}$ Se $_{2}$

Z. -H. Liu, P. Richard, N. Xu +11

We report a comprehensive angle-resolved photoemission spectroscopy study of the tridimensional electronic bands in the recently discovered Fe selenide superconductor (Tl,Rb) $_{y}$ Fe…

cond-mat.supr-con2012★ 64 cited

Orbital Characters Determined from Fermi Surface Intensity Patterns using Angle-Resolved Photoemission Spectroscopy

X. -P. Wang, P. Richard, Y. -B. Huang +10

In order to determine the orbital characters on the various Fermi surface pockets of the Fe-based superconductors Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$ and FeSe $_{0.45}$ Te $_{0.55}$ ,…

cond-mat.supr-con2011★ 172 cited

Unconventional Anisotropic s-Wave Superconducting Gaps of LiFeAs Iron-Pnictide Superconductor

K. Umezawa, Y. Li, H. Miao +10

We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (Tc = 18 K). We reveal multiple nodeless superconducting (SC) gaps wit…

cond-mat.supr-con2011★ 137 cited

Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45

H. Miao, P. Richard, Y. Tanaka +17

The momentum distribution of the energy gap opening at the Fermi level of superconductors is a direct fingerprint of the pairing mechanism. While the phase diagram of the iron-base…

cond-mat.supr-con2011★ 13 cited

Two pseudogaps with different energy scales at the antinode of the high-temperature Bi $_{2}$ Sr $_{2}$ CuO $_{6}$ superconductor using angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, Y. -M. Xu +8

We have performed high-resolution angle-resolved photoemission spectroscopy on single-layered cuprate Bi $_{2}$ Sr $_{2}$ CuO $_{6}$ to clarify the origin of the pseudogap. By using various p…

cond-mat.supr-con2010★ 96 cited

Universality of superconducting gaps in overdoped Ba0.3K0.7Fe2As2 observed by angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, P. Richard +8

We have performed angle-resolved photoemission spectroscopy on the overdoped Ba $_{0.3}$ K $_{0.7}$ Fe $_{2}$ As $_{2}$ superconductor ( $T_{c}$ = 22 K). We demonstrate that the superconducting…

cond-mat.supr-con2010★ 1 cited

Fermiology of Sr4V2O6Fe2As2: Quasi-Nested Fe vs Mott-Insulating V Orbitals

T. Qian, N. Xu, Y. -B. Shi +14

We have performed an angle-resolved photoemission spectroscopy study of a new iron-based superconductor Sr4V2O6Fe2As2. While V 3d orbitals are found to be in a Mott insulator state…

cond-mat.supr-con2010★ 81 cited

Unconventional superconducting gap in NaFe $_{0.95}$ Co $_{0.05}$ As observed by angle-resolved photoemission spectroscopy

Z. -H. Liu, P. Richard, K. Nakayama +16

We have performed high resolution angle-resolved photoemission measurements on superconducting electron-doped NaFe $_{0.95}$ Co $_{0.05}$ As ( $T_{c} \sim$ 18 K). We observed a hole-like…

cond-mat.supr-con2009★ 82 cited

Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides

Y. -M. Xu, P. Richard, K. Nakayama +15

High-temperature superconductivity in iron-arsenic materials (pnictides) near an antiferromagnetic phase raises the possibility of spin-fluctuation-mediated pairing. However, the i…

cond-mat.supr-con2008★ 120 cited

Electronic structure of heavily electron-doped BaFe $_{1.7}$ Co $_{0.3}$ As $_{2}$ studied by angle-resolved photoemission

Y. Sekiba, T. Sato, K. Nakayama +9

We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe $_{1.7}$ Co $_{0.3}$ As $_{2}$ . We find that the two ho…

Is BaCr2​As2​ symmetrical to BaFe2​As2​ with respect to half 3d shell filling?

Observation of non-Fermi liquid behavior in hole-doped LiFe1−x​Vx​As

Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with suppressed superconductivity in LiFe1−x​Cox​As