609 citations · 5k across the 87 of their papers we have counts for
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Translational symmetry breaking in the electronic nematic phase of BaFe2As2
K. Koshiishi, L. Liu, K. Okazaki +13
The microscopic origin of the nematicity, namely, four-fold rotational symmetry breaking in iron-based superconductors has been controversial since its discovery. In particular, it…
Single-Crystal Growth and Characterization of Cuprate Superconductor (Hg,Re)BaCaCuO
Yutaro Mino, Shigeyuki Ishida, Junichiro Kato +8
We grew (Hg,Re)BaCaCuO ((Hg,Re)1223) single crystals with good reproducibility via the single-step flux method using monoxides as raw materials. A double-sealin…
Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum
Yusuke Iguchi, Ruby Shi, Kunihiro Kihou +4
The magnetic response is a state-defining property of superconductors. The magnetic flux penetrates type-II bulk superconductors by forming quantum vortices when the enclosed magne…
Calorimetric evidence for two phase transitions in BaKFeAs with fermion pairing and quadrupling states
Ilya Shipulin, Nadia Stegani, Ilaria Maccari +9
Theoretically, materials that break multiple symmetries allow, under certain conditions, the formation of four-fermion condensates above the superconducting critical temperature. S…
Elastoresistivity of heavily hole doped 122 iron pnictides superconductors
Xiaochen Hong, Steffen Sykora, Federico Caglieris +8
Nematicity in the heavily hole-doped iron pnictide superconductors remains controversial. Sizeable nematic fluctuations and even nematic orders far from a magnetic instability were…
Quartic metal: Spontaneous breaking of time-reversal symmetry due to four-fermion correlations in BaKFeAs
Vadim Grinenko, Daniel Weston, Federico Caglieris +19
Discoveries of ordered quantum states of matter are of great fundamental interest, and often lead to unique applications. The most well known example -- superconductivity -- is cau…
Elastoresistance measurements on CaKFeAs and KCaFeAsF with the Fe site of symmetry
Taichi Terashima, Yoshitaka Matsushita, Hiroyuki Yamase +11
We report resistance and elastoresistance measurements on (BaK)FeAs, CaKFeAs, and KCaFeAsF. The Fe-site symmetry is in the…
Emerging superconductivity with broken time reversal symmetry inside a superconducting -wave state
V. Grinenko, R. Sarkar, K. Kihou +17
In general, magnetism and superconductivity are antagonistic to each other. However, there are several families of superconductors, in which superconductivity may coexist with magn…
Anomalous peak effect in iron-based superconductors BaKFeAs ( 0.69 and 0.76) for magnetic-field directions close to the plane and its possible relation to the spin paramagnetic effect
Taichi Terashima, Naoki Kikugawa, Andhika Kiswandhi +7
We report magnetic torque measurements on iron-pnictide superconductors BaKFeAs ( 0.69 and 0.76) up to an applied field of = 45 T. The peak eff…
Diverse fluctuations and anisotropic Gr{\" u}neisen parameter behavior in iron-based superconductor Ba(FeCo)As and their correlation with superconductivity
Chiaki Fujii, Shalamujiang Simayi, Kouhei Sakano +10
In this study, the temperature dependence of elastic constants , , , and of the iron-based superconductor Ba(Fe$_{1…
Anisotropy and multiband superconductivity in Sr2RuO4
S. J. Kuhn, W. Morgenlander, E. R. Louden +8
Despite numerous studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have extended previous small-angle neutron scattering studies of…
Superconductivity with broken time reversal symmetry in ion irradiated BaKFeAs single crystals
V. Grinenko, P. Materne, R. Sarkar +7
Over the last years a lot of theoretical and experimental efforts have been made to find states with broken time reversal symmetry (BTRS) in multi-band superconductors. In particul…
Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(FeRu)As: Effects of spin-orbit coupling
L. Liu, K. Okazaki, T. Yoshida +22
We have investigated the superconducting gap of optimally doped Ba(FeRu)As by angle-resolved photoemission spectroscopy (APRES) using bulk-sensitive 7 eV…
Spin excitations in hole-overdoped iron-based superconductors
K. Horigane, K. Kihou, K. Fujita +5
Understanding the overall features of magnetic excitation is essential for clarifying the mechanism of Cooper pair formation in iron-based superconductors. In particular, clarifyin…
Suppression of low-energy longitudinal spin-excitations in Co-underdoped BaFe2As2
F. Waßer, C. H. Lee, K. Kihou +4
Polarized inelastic neutron scattering experiments were performed to study magnetic excitations in the normal and superconducting phases of Co-underdoped BaFeAs, which exhi…
Suppression of spin-exciton state in hole overdoped iron-based superconductors
C. H. Lee, K. Kihou, J. T. Park +7
The mechanism of Cooper pair formation in iron-based superconductors remains a controversial topic. The main question is whether spin or orbital fluctuations are responsible for th…
Simultaneous Evidence for Pauli Paramagnetic Effects and Multiband Superconductivity in KFeAs by Small-Angle Neutron Scattering Studies of the Vortex Lattice
S. J. Kuhn, H. Kawano-Furukawa, E. Jellyman +11
We study the intrinsic anisotropy of the superconducting state in KFeAs, using small-angle neutron scattering to image the vortex lattice as the applied magnetic field is r…
Orbital anisotropy underlying the superconducting dome in BaFe(AsP) superconductors
T. Sonobe, T. Shimojima, A. Nakamura +8
We investigate the in-plane anisotropy of Fe 3d orbitals occurring in a wide temperature and composition range of BaFe2(As1-xPx)2 system. By employing the angle-resolved photoemiss…
In-plane electronic anisotropy in the antiferromagnetic-orthorhombic phase of isovalent-substituted Ba(FeRu)As
L. Liu, T. Mikami, S. Ishida +17
We have studied the anisotropy in the in-plane resistivity and the electronic structure of isovalent Ru-substituted BaFeAs in the antiferromagnetic-orthorhombic phase using…
Anisotropy of incommensurate magnetic excitations in slightly overdoped BaKFeAs probed by polarized inelastic neutron scattering experiments
N. Qureshi, C. H. Lee, K. Kihou +3
Polarized neutron scattering experiments on the slightly overdoped superconductor BaKFeAs reveal broad magnetic resonance scattering peaking at approximatel…
Magnetic form factor analysis on detwinned single crystal of BaFeAs
K. Kodama, M. Ishikado, S. Wakimoto +5
We have performed neutron diffraction measurement on a single crystal of parent compound of iron-based superconductor, BaFeAs at 12~K. In order to investigate in-plane anis…
Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from Laser ARPES
W. Malaeb, T. Shimojima, Y. Ishida +15
We performed a Laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1-xKxFe2As2 (BaK) iron-based superconductor. We observed a robust low-bindi…
Identifying the `Fingerprint' of Antiferromagnetic Spin-Fluctuations on Iron-Pnictide Superconductivity
Milan P. Allan, Kyungmin Lee, Andreas W. Rost +9
Cooper pairing in the iron-based high-Tc superconductors is often conjectured to involve bosonic fluctuations. Among the candidates are antiferromagnetic spin-fluctuations and d-or…
Electronic structure of BaNiP observed by angle-resolved photoemission spectroscopy
S. Ideta, T. Yoshida, M. Nakajima +16
We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNiP which shows a superconducting transition at 2.5 K. We observed hole and e…