T. Takayama

activity

20112022

most citedKitaev quantum spin liquid - concept and materialization

832 citations · 2.9k across the 41 of their papers we have counts for

collaborators

41 papers

cond-mat.str-el2022★ 40 cited

Magnetic and Electrical Properties of high-entropy rare-earth manganites

Ashutosh Kumar, David Bérardan, Diana Dragoe +4

Detailed investigations of structural, magnetic and electronic transport properties of hole-doped high-entropy rare-earth manganites are presented. The high-entropy samples (LaNdPr…

cond-mat.str-el2022★ 12 cited

Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate $β$ -Li $_{2}$ IrO $_{3}$

Thomas Halloran, Yishu Wang, Mengqun Li +8

We present a thorough experimental study of the three-dimensional hyperhoneycomb Kitaev magnet $β$ -Li $_{2}$ IrO $_{3}$ , using a combination of inelastic neutron scattering (INS), time-do…

cond-mat.supr-con2021★ 78 cited

Discovery of Superconductivity in (Ba,K)SbO $_{3}$

Minu Kim, Graham M. McNally, Hun-Ho Kim +12

Superconducting bismuthates (Ba,K)BiO $_{3}$ (BKBO) constitute an interesting class of superconductors in that superconductivity with a remarkably high $T_{c}$ of 30 K arises…

cond-mat.str-el2021

Evidence for strong electron correlations in a non-symmorphic Dirac semimetal

Yu-Te Hsu, Danil Prishchenko, Maarten Berben +8

Metallic iridium oxides (iridates) provide a fertile playground to explore new phenomena resulting from the interplay between topological protection, spin-orbit and electron-electr…

cond-mat.str-el2021★ 141 cited

Spin-orbit-entangled electronic phases in 4 $d$ and 5 $d$ transition-metal compounds

Tomohiro Takayama, Jiri Chaloupka, Andrew Smerald +2

Complex oxides with $4 d$ and $5 d$ transition-metal ions recently emerged as a new paradigm in correlated electron physics, due to the interplay between spin-orbit coupling and elec…

cond-mat.str-el2021★ 10 cited

Lattice dynamics and structural transition of the hyperhoneycomb iridate $β$ -Li $_{2}$ IrO $_{3}$ investigated by high-pressure Raman scattering

Sungkyun Choi, Heung-Sik Kim, Hun-Ho Kim +8

We report a polarized Raman scattering study of the lattice dynamics of $β$ -Li $_{2}$ IrO $_{3}$ under hydrostatic pressures up to 7.62 GPa. At ambient pressure, $β$ -Li $_{2}$ IrO $_{3}$ exhibit…

cond-mat.supr-con2020★ 30 cited

Charge Order Lock-in by Electron-Phonon Coupling in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$

Qisi Wang, K. von Arx, M. Horio +11

We report an ultrahigh resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bond-stretching phonon mode in stripe-ordered cuprate La $_{1.675}$ Eu $_{0.2}$ Sr$_{…

cond-mat.supr-con2020★ 4 cited

Effect of pressure on the pseudogap and charge-density-wave phases of the cuprate La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ probed by thermopower measurements

A. Gourgout, A. Ataei, M. -E. Boulanger +9

We report thermopower measurements under hydrostatic pressure on the cuprate superconductor La $_{1.6 - x}$ Nd $_{0.4}$ Sr $_{x}$ CuO $_{4}$ (Nd-LSCO), at low-temperature in the normal state ac…

cond-mat.str-el2020★ 7 cited

The spontaneous symmetry breaking in Ta $_{2}$ NiSe $_{5}$ is structural in nature

Edoardo Baldini, Alfred Zong, Dongsung Choi +16

The excitonic insulator is an electronically-driven phase of matter that emerges upon the spontaneous formation and Bose condensation of excitons. Detecting this exotic order in ca…

cond-mat.str-el2020★ 43 cited

Phononic soft mode and strong electronic background behavior across the structural phase transition in the excitonic insulator Ta $_{2}$ NiSe $_{5}$ (with Erratum)

Min-Jae Kim, Armin Schulz, Tomohiro Takayama +3

Ta $_{2}$ NiSe $_{5}$ became one of the most investigated candidate materials for hosting an excitonic insulator ground state. Many studies describe the corresponding phase transition as…

cond-mat.str-el2020★ 2 cited

Magnetic correlations in the semimetallic hyper-kagome iridate Na3Ir3O8

G. Simutis, T. Takayama, Q. Barthélemy +3

We present a microscopic study of a doped quantum spin liquid candidate, the hyperkagome Na $_{3}$ Ir $_{3}$ O $_{8}$ compound by using $^{23}$ Na NMR. We determine the intrinsic behavior of t…

cond-mat.supr-con2020★ 165 cited

Phonons become chiral in the pseudogap phase of cuprates

G. Grissonnanche, S. Thériault, A. Gourgout +11

The nature of the pseudogap phase of cuprates remains a major puzzle. One of its new signatures is a large negative thermal Hall conductivity $κ_{xy}$ , which appears for doping…

cond-mat.str-el2020★ 32 cited

Quantum Paraelectricity in the Kitaev Quantum-Spin-Liquid Candidates H $_{3}$ LiIr $_{2}$ O $_{6}$ and D $_{3}$ LiIr $_{2}$ O $_{6}$

K. Geirhos, P. Lunkenheimer, M. Blankenhorn +7

H3LiIr2O6 is the first honeycomb-lattice system without any signs of long-range magnetic order down to the lowest temperatures, raising the hope for the realization of an ideal Kit…

cond-mat.supr-con2019★ 31 cited

High-Temperature Charge-Stripe Correlations in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$

Qisi Wang, M. Horio, K. von Arx +24

We use resonant inelastic x-ray scattering to investigate charge-stripe correlations in La $_{1.675}$ Eu $_{0.2}$ Sr $_{0.125}$ CuO $_{4}$ . By differentiating elastic from inelastic scatter…

cond-mat.str-el2019★ 23 cited

Pressure-induced structural dimerization in the hyperhoneycomb iridate $β$ -Li $_{2}$ IrO $_{3}$ at low temperatures

L. S. I. Veiga, K. Glazyrin, G. Fabbris +10

A pressure-induced collapse of magnetic ordering in $β$ -Li $_{2}$ IrO $_{3}$ at $P_{m} \sim 1.5 - 2$ GPa has previously been interpreted as evidence for possible emergence of spin liquid state…

cond-mat.str-el2019★ 832 cited

Kitaev quantum spin liquid - concept and materialization

Hidenori Takagi, Tomohiro Takayama, George Jackeli +2

A decade ago, Alexei Kitaev proposed an exactly solvable $S$ = 1/2 model on a two-dimensional honeycomb lattice, where the spins fractionalize into Majorana fermions and form a top…

cond-mat.supr-con2019★ 29 cited

Band Structure of Overdoped Cuprate Superconductors: Density Functional Theory Matching Experiments

K. P. Kramer, M. Horio, S. S. Tsirkin +25

A comprehensive angle resolved photoemission spectroscopy study of the band structure in single layer cuprates is presented with the aim of uncovering universal trends across diffe…

cond-mat.str-el2019★ 4 cited

Long-range magnetic ordering in rocksalt-type high-entropy oxides

Marco Polo Jimenez-Segura, Tomohiro Takayama, David Bérardan +4

We report the magnetic properties of Mg $_{0.2}$ Co $_{0.2}$ Ni $_{0.2}$ Cu $_{0.2}$ Zn $_{0.2}$ O, a high-entropy oxide with rocksalt structure, and the influence of substitutions on these…

cond-mat.str-el2018★ 15 cited

Monoclinic SrIrO $_{3}$ - A Dirac semimetal produced by non-symmorphic symmetry and spin-orbit coupling

T. Takayama, A. N. Yaresko, H. Takagi

SrIrO $_{3}$ crystallizes in a monoclinic structure of distorted hexagonal perovskite at ambient pressure. The transport measurements show that the monoclinic SrIrO $_{3}$ is a low-carri…

cond-mat.str-el2018★ 24 cited

Almost pure $J_{eff} = 1/2$ Mott state of In $_{2}$ Ir $_{2}$ O $_{7}$ in the limit of reduced inter-site hopping

A. Krajewska, T. Takayama, R. Dinnebier +4

The pyrochlore iridate In $_{2}$ Ir $_{2}$ O $_{7}$ is a strong $J_{eff} = 1/2$ Mott insulator with frustrated magnetism. Despite the large trigonal crystal field, a small admixture…

cond-mat.str-el2018★ 42 cited

Infrared phonon spectra of quasi-one-dimensional Ta $_{2}$ NiSe $_{5}$ and Ta $_{2}$ NiS $_{5}$

T. I. Larkin, R. D. Dawson, M. Höppner +6

Using a combination of infrared ellipsometry, time-domain terahertz spectroscopy, and far-infrared reflectometry we have obtained the $a c$ -plane complex dielectric function of mono…

cond-mat.supr-con2018★ 194 cited

Thermodynamic signatures of quantum criticality in cuprates

B. Michon, C. Girod, S. Badoux +14

The three central phenomena of cuprate superconductors are linked by a common doping $p^{⋆}$ , where the enigmatic pseudogap phase ends, around which the superconducting phase f…

cond-mat.supr-con2018★ 94 cited

Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates

M. Horio, K. Hauser, Y. Sassa +24

We present a soft x-ray angle-resolved photoemission spectroscopy study of the overdoped high-temperature superconductors La $_{2 - x}$ Sr $_{x}$ CuO $_{4}$ and La $_{1.8 - x}$ Eu $_{0.2}$ Sr $_{x}$ Cu…

cond-mat.supr-con2018★ 49 cited

Superconductivity in Layered Pnictides BaRh2P2 and BaIr2P2

Daigorou Hirai, Tomohiro Takayama, Ryuji Higashinaka +2

Bulk superconductivity was discovered in BaRh2P2 (Tc = 1.0 K) and BaIr2P2 (Tc = 2.1 K), which are isostructural to (Ba,K)Fe2As2, indicative of the appearance of superconductivity o…

Magnetic and Electrical Properties of high-entropy rare-earth manganites

Magnetic Excitations and Interactions in the Kitaev Hyperhoneycomb Iridate β-Li2​IrO3​

Discovery of Superconductivity in (Ba,K)SbO3​

Evidence for strong electron correlations in a non-symmorphic Dirac semimetal

Spin-orbit-entangled electronic phases in 4d and 5d transition-metal compounds

Lattice dynamics and structural transition of the hyperhoneycomb iridate β-Li2​IrO3​ investigated by high-pressure Raman scattering

Charge Order Lock-in by Electron-Phonon Coupling in La1.675​Eu0.2​Sr0.125​CuO4​

Effect of pressure on the pseudogap and charge-density-wave phases of the cuprate La1.6−x​Nd0.4​Srx​CuO4​ probed by thermopower measurements

The spontaneous symmetry breaking in Ta2​NiSe5​ is structural in nature

Phononic soft mode and strong electronic background behavior across the structural phase transition in the excitonic insulator Ta2​NiSe5​ (with Erratum)