F. Iga
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View article: Quantum Oscillations in the Heat Capacity of Kondo Insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbB</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Quantum Oscillations in the Heat Capacity of Kondo Insulator Open
We observe magnetic quantum oscillations in the heat capacity of the Kondo insulator YbB_{12}. The frequency of these oscillations, F=700 T, agrees with that from magnetoresistance and torque magnetometry experiments for μ_{0}H>35 T in the…
View article: Bulk modulus and thermal expansion of rare-earth tetraborides RB4 (R = Gd, Tb, Dy, Ho, and Tm) via <i>in situ</i> x-ray diffraction
Bulk modulus and thermal expansion of rare-earth tetraborides RB4 (R = Gd, Tb, Dy, Ho, and Tm) via <i>in situ</i> x-ray diffraction Open
X-ray diffraction experiments were conducted on the rare-earth tetraborides RB4 (R = Gd, Tb, Dy, Ho, and Tm) under high pressure at room temperature and low temperature at atmospheric pressure to investigate their structural and lattice be…
View article: Study of Local Atomic Structures of Sm Doped YbB<sub>6</sub> Observed by X-ray Fluorescence Holography
Study of Local Atomic Structures of Sm Doped YbB<sub>6</sub> Observed by X-ray Fluorescence Holography Open
View article: Author Correction: Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator
Author Correction: Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator Open
View article: Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator
Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator Open
View article: Kondo breakdown in the topological Kondo insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Sm</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math> studied by point-contact Andreev reflection spectroscopy
Kondo breakdown in the topological Kondo insulator studied by point-contact Andreev reflection spectroscopy Open
We studied the topological features in Kondo insulator $\mathrm{Sm}{\mathrm{B}}_{6}$ by point-contact Andreev reflection spectroscopy with a Nb probe tip. Below the superconducting transition of Nb, the spectra exhibited a narrow dip at ar…
View article: Resonant x-ray diffraction study using circularly polarized x rays on antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>TbB</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
Resonant x-ray diffraction study using circularly polarized x rays on antiferromagnetic Open
Resonant x-ray diffraction (RXD) measurements at the Tb L3 and the M5 edges were carried out on a single crystal of a rare-earth tetraboride, TbB4, which exhibits antiferromagnetic (AFM) o…
View article: Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB6(001)
Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB6(001) Open
The topology and spin-orbital polarization of two-dimensional (2D) surface electronic states have been extensively studied in this decade. One major interest in them is their close relationship with the parities of the bulk (3D) electronic…
View article: Possible stripe phases in the multiple magnetization plateaus in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>TbB</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:math> from single-crystal neutron diffraction under pulsed high magnetic fields
Possible stripe phases in the multiple magnetization plateaus in from single-crystal neutron diffraction under pulsed high magnetic fields Open
We present a single-crystal neutron diffraction study on the\nShastry-Sutherland lattice system TbB$_4$ at zero magnetic field and under\npulsed high magnetic fields up to 35 T applied along the crystallographic $c$\naxis. While our result…
View article: Hall Anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbB</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Evidence for Unconventional Charge Transport
Hall Anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator : Evidence for Unconventional Charge Transport Open
In correlated electronic systems, strong interactions and the interplay between different degrees of freedom may give rise to anomalous charge-transport properties, which can be tuned by external parameters like temperature and magnetic fi…
View article: Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB$_6$(001)
Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB$_6$(001) Open
The topology and spin-orbital polarization of two-dimensional (2D) surface electronic states have been extensively studied in this decade. One major interest in them is their close relationship with the parities of the bulk (3D) electronic…
View article: Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB$_{12}$: Evidence for Unconventional Charge Transport
Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB$_{12}$: Evidence for Unconventional Charge Transport Open
In correlated electronic systems, strong interactions and the interplay between different degrees of freedom may give rise to anomalous charge transport properties, which can be tuned by external parameters like temperature and magnetic fi…
View article: Unusual high-field metal in a Kondo insulator
Unusual high-field metal in a Kondo insulator Open
View article: Robust hybridization gap in the Kondo insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Yb</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math> probed by femtosecond optical spectroscopy
Robust hybridization gap in the Kondo insulator probed by femtosecond optical spectroscopy Open
In heavy fermions the relaxation dynamics of photoexcited carriers has been\nfound to be governed by the low energy indirect gap, E$_{g}$, resulting from\nhybridization between localized moments and conduction band electrons. Here,\ncarrie…
View article: Field-induced valence fluctuations in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>YbB</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>
Field-induced valence fluctuations in Open
We performed high-magnetic-field ultrasonic experiments on YbB$_{12}$ up to 59 T to investigate the valence fluctuations in Yb ions. In zero field, the longitudinal elastic constant $C_{11}$, the transverse elastic constants $C_{44}$ and $…
View article: Point-Contact Spectroscopy Study of Kondo Insulator SmB<sub>6</sub>
Point-Contact Spectroscopy Study of Kondo Insulator SmB<sub>6</sub> Open
View article: Physical Properties of Novel Material TmB<sub>6</sub> Synthesized by Molecular Beam Epitaxy Method
Physical Properties of Novel Material TmB<sub>6</sub> Synthesized by Molecular Beam Epitaxy Method Open
View article: Novel Dynamical Properties in the Zero-Field Antiferroquadrupole Ordered State of CeB<sub>6</sub>
Novel Dynamical Properties in the Zero-Field Antiferroquadrupole Ordered State of CeB<sub>6</sub> Open
11 B-nuclear magnetic resonance (NMR) measurements have been carried out on CeB 6 , a prototypical compound for antiferro-quadrupole (AFQ) ordering.NMR spectra were successfully obtained even below 0.1 T where some macroscopic measurements…
View article: The Temperature Dependence of the Magnetization Process of the Kondo Insulator YbB12
The Temperature Dependence of the Magnetization Process of the Kondo Insulator YbB12 Open
The properties of the Kondo insulator in a strong magnetic field are one of the most intriguing subjects in condensed matter physics. The Kondo insulating state is expected to be suppressed by magnetic fields, which results in the dramatic…
View article: High Pressure Synthesis and Physical Properties under High Pressure of Topological Kondo Insulators YbB<sub>12</sub> and SmB<sub>6</sub>
High Pressure Synthesis and Physical Properties under High Pressure of Topological Kondo Insulators YbB<sub>12</sub> and SmB<sub>6</sub> Open
In this article, recent topics in the high-pressure synthesis and physical properties under high pressure circumstance on Topological Kondo Insulators SmB6 and YbB12 were reviewed. As for high pressure synthesis of substitution by Ca for Y…
View article: Material Development of Kondo Insulator Yb<sub>1−</sub><i><sub>x</sub></i>Ca<i><sub>x</sub></i>B<sub>12</sub> by High-Pressure Synthesis
Material Development of Kondo Insulator Yb<sub>1−</sub><i><sub>x</sub></i>Ca<i><sub>x</sub></i>B<sub>12</sub> by High-Pressure Synthesis Open
View article: Divalent ion substitution effect on Yb-site in Kondo insulator YbB12
Divalent ion substitution effect on Yb-site in Kondo insulator YbB12 Open
YbB12 has been investigated energetically as a typical Kondo insulator. To study detailed formation mechanism of Kondo energy gap, we have investigated transport and magnetic properties of Yb1-xR3+xB12 (R3+ = non-magnetic trivalent ions). …
View article: Non-magnetic element substitution effect in Kondo insulator YbB12 and exotic surface effect in this alloy system
Non-magnetic element substitution effect in Kondo insulator YbB12 and exotic surface effect in this alloy system Open
Kondo temperature TK’s for Kondo insulator alloys Yb1-xRxB12 (R = Y, Lu, Sc and Zr) show drastic variation as every x increase. It is found that YbB12 in a virtual gap-less state would have a peak at about 25 K in magnetic susceptibility χ…
View article: Magnetic properties of perovskite Ca1−<i>x</i>Sr<i>x</i>FeO3
Magnetic properties of perovskite Ca1−<i>x</i>Sr<i>x</i>FeO3 Open
We synthesized Ca1−xSrxFeO3 containing tetravalent iron Fe4+ with high valence by low temperature heat treatment along with ozone oxidization. We investigated the magnetic properties of perovskite Ca1−xSrxFeO3. The charge disproportionatio…
View article: Kondo-like behavior near the magnetic instability in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="bold">SmB</mml:mi><mml:mn mathvariant="bold">6</mml:mn></mml:msub></mml:math>: Temperature and pressure dependences of the Sm valence
Kondo-like behavior near the magnetic instability in : Temperature and pressure dependences of the Sm valence Open
We report a systematic study of Sm valence in the prototypical intermediate valence compound SmB$_6$. Sm mean valence, $v_{\rm Sm}$, was measured by X-ray absorption spectroscopy as functions of pressure ($1
View article: Non-trivial surface states of the Kondo insulator SmB$_6$ unveiled from the new crystal orientation
Non-trivial surface states of the Kondo insulator SmB$_6$ unveiled from the new crystal orientation Open
The peculiar metallic electronic states observed in the Kondo insulator, Samarium hexaboride (SmB$_6$), has stimulated considerable attention in the study of novel and non-trivial electronic phenomena. However, the experimental results of …
View article: Evidence for in-gap surface states on the single phase SmB6(001) surface
Evidence for in-gap surface states on the single phase SmB6(001) surface Open
Structural and electronic properties of the SmB 6 (001) single-crystal surface prepared by Ar + ion sputtering and controlled annealing are investigated by scanning tunneling microscopy. In contrast to the cases of cleaved surfaces, we obs…
View article: Electronic states in the pressure-induced magnetically ordered phase in SmB<sub>6</sub>
Electronic states in the pressure-induced magnetically ordered phase in SmB<sub>6</sub> Open
We have carried out the high-pressure measurement of X-ray absorption spectroscopy on the intermediate valence compound SmB6 which shows magnetic ordering as well as an insulator-metal transition at critical pressure Pc ∼ 10 GPa. The valen…
View article: Magnetization Process of the Kondo Insulator YbB<sub>12</sub> in Ultrahigh Magnetic Fields
Magnetization Process of the Kondo Insulator YbB<sub>12</sub> in Ultrahigh Magnetic Fields Open
The magnetization process of the Kondo insulator YbB12 has been unveiled in ultrahigh magnetic fields of up to 120 T at 4.2 K. We have found a novel metamagnetic transition at Bc2 = 102 T in addition to the previously known transition at B…
View article: Temperature dependence of Yb valence in the sub-surface of YbB<sub>12</sub>(001)
Temperature dependence of Yb valence in the sub-surface of YbB<sub>12</sub>(001) Open
The typical Kondo insulator, YbB12, is a candidate of topological Kondo insulators. To clarify the surface electronic structure of not only bulk but also surface by photoelectron measurements, we developed a method to obtain a clean surfac…