Shunichiro Kittaka
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View article: Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr$_2$Zn$_{20}$
Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr$_2$Zn$_{20}$ Open
We performed field-angle-resolved magnetostriction and thermal-expansion measurements on PrIr$_2$Zn$_{20}$, a cubic non-Kramers compound exhibiting antiferroquadrupolar order below $T_{\rm Q}=0.125$ K. Thermal expansion exhibits two qualit…
View article: High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4
High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4 Open
We performed high-resolution magnetostriction measurements on the Pauli-limited superconductor Sr$_2$RuO$_4$ using high-quality single crystals. A first-order superconducting transition, accompanied by pronounced hysteresis, was observed u…
View article: Rotational Grüneisen ratio: A probe for quantum criticality in anisotropic systems
Rotational Grüneisen ratio: A probe for quantum criticality in anisotropic systems Open
The Gr\"{u}neisen ratio $\Gamma$ and its magnetic analog, the magnetic Gr\"{u}neisen ratio $\Gamma_H$, are powerful probes to study the nature of quantum phase transitions. Here, we propose a Gr\"{u}neisen parameter, the rotational Gr\"{u}…
View article: Field-Induced Criticality in YbCu4Au
Field-Induced Criticality in YbCu4Au Open
YbCu4Au is a unique material exhibiting multiple quantum fluctuations simultaneously. In this study, we investigated the field-induced criticality in YbCu4Au, based on comprehensive micro and macro measurements, including powder X-ray diff…
View article: Multiple magnetic orders discovered in the superconducting state of EuFe<sub>2</sub>(As <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> P <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> )<sub>2</sub>
Multiple magnetic orders discovered in the superconducting state of EuFe<sub>2</sub>(As P )<sub>2</sub> Open
The interplay between superconductivity and magnetism is an important subject in condensed matter physics. EuFe 2 As 2 -based iron pnictides could offer an interesting plateau to study their relationship that has attracted considerable att…
View article: Anisotropy of the magnetic-field-induced phase pocket in the non-Kramers doublet system <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>PrIr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Zn</mml:mi><mml:mn>20</mml:mn></mml:msub></mml:mrow></mml:math>
Anisotropy of the magnetic-field-induced phase pocket in the non-Kramers doublet system Open
We provide thermodynamic evidence for the presence of a\nmagnetic-field-induced small phase pocket near the antiferro-quadrupole (AFQ)\nphase boundary in the non-Kramers $\\Gamma_3$ doublet system PrIr$_2$Zn$_{20}$.\nIn particular, we meas…
View article: CCDC 985033: Experimental Crystal Structure Determination
CCDC 985033: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Modulation vector of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 revealed by high-resolution magnetostriction measurements
Modulation vector of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 revealed by high-resolution magnetostriction measurements Open
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is an exotic superconducting phase formed by Cooper pairs with finite center-of-mass momentum $q$. On theoretical grounds, the superconducting order parameter in the FFLO state is spatially…
View article: Piezomagnetic switching of the anomalous Hall effect in an antiferromagnet at room temperature
Piezomagnetic switching of the anomalous Hall effect in an antiferromagnet at room temperature Open
View article: Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields Open
Magnetic-field-angle-resolved specific heat and magnetization measurements were conducted on a ferromagnetic superconductor UCoGe with remarkable anisotropic upper critical field $H_{\rm c2}$. Although $H_{\rm c2}$ reaches a high magnetic …
View article: CCDC 1403881: Experimental Crystal Structure Determination
CCDC 1403881: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1403882: Experimental Crystal Structure Determination
CCDC 1403882: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Gapped ground state in a spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> frustrated square lattice
Gapped ground state in a spin- frustrated square lattice Open
We present a model compound with a spin-1/2 frustrated square lattice, in\nwhich three ferromagnetic (F) interactions and one antiferromagnetic (AF)\ncompet. Considering the effective spin-1 formed by the dominant F dimer, this\nsquare lat…
View article: Erratum: Quadrupole Order in the Frustrated Pyrochlore <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Tb</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Ti</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>+</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> [Phys. Rev. Lett. <b>116</b>, 217201 (2016)]
Erratum: Quadrupole Order in the Frustrated Pyrochlore [Phys. Rev. Lett. <b>116</b>, 217201 (2016)] Open
This corrects the article DOI: 10.1103/PhysRevLett.116.217201.
View article: Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite
Thermal Hall Effects of Spins and Phonons in Kagome Antiferromagnet Cd-Kapellasite Open
We have investigated the thermal-transport properties of the kagome\nantiferromagnet Cd-kapellasite (Cd-K). We find that a field suppression effect\non the longitudinal thermal conductivity k_xx sets in below ~25 K, suggesting a\nlarge spi…
View article: Fully gapped superconductivity without sign reversal in the topological superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>PbTaSe</mml:mi><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math>
Fully gapped superconductivity without sign reversal in the topological superconductor Open
We investigate the superconducting gap function of topological superconductor\nPbTaSe$_2$. Temperature, magnetic field, and three-dimensional (3D) field-angle\ndependences of the specific heat prove that the superconductivity of PbTaSe$_2$…
View article: Synthesis and Magnetic Properties of M<sup>2+</sup>Ti<sup>4+</sup> Substituted Ba<sub>12</sub>Fe<sub>28</sub>Ti<sub>15</sub>O<sub>84</sub>
Synthesis and Magnetic Properties of M<sup>2+</sup>Ti<sup>4+</sup> Substituted Ba<sub>12</sub>Fe<sub>28</sub>Ti<sub>15</sub>O<sub>84</sub> Open
We investigated the synthesis conditions and magnetic properties of M-Ti substituted Ba12Fe28Ti15O84 with initial compositions of Ba12Fe28-2xTi15+xMxO84 (M = Zn, Mg, Ni, Cu, and Co) sintered at 1100-1300°C. The highest substitution amounts…
View article: Field-Orientation Effect on Ferro-Quadrupole Order in PrTi<sub>2</sub>Al<sub>20</sub>
Field-Orientation Effect on Ferro-Quadrupole Order in PrTi<sub>2</sub>Al<sub>20</sub> Open
Ferro-quadrupole (FQ) order in the non-Kramers $\\Gamma_3$ doublet system\nPrTi$_2$Al$_{20}$ has been investigated via angle-resolved measurements of the\nspecific heat, rotational magnetocaloric effect, and entropy, under a rotating\nmagn…
View article: Emergent critical phenomenon in spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math> ferromagnetic-leg ladders: Quasi-one-dimensional Bose–Einstein condensate
Emergent critical phenomenon in spin- ferromagnetic-leg ladders: Quasi-one-dimensional Bose–Einstein condensate Open
We examine the magnetic-field-induced criticality of phase boundary near saturation field $H_{\mathrm{c}}$ in the spin-1/2 ferromagnetic (FM)-leg ladder 3-Cl-4-F-V [=3-(3-chloro-4-fluorophenyl)-1,5-diphenylverdazyl], the predominant intera…
View article: Quasiparticle Evidence for the Nematic State above <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi mathvariant="normal">c</mml:mi></mml:msub></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>
Quasiparticle Evidence for the Nematic State above in Open
In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. Electronic nematic states have been observed in various unconventional superconductors such as cuprate, iron-based, h…
View article: CCDC 1889996: Experimental Crystal Structure Determination
CCDC 1889996: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Thermodynamic evidence for novel quantum criticality in a frustrated metal
Thermodynamic evidence for novel quantum criticality in a frustrated metal Open
Various exotic phases of matter have been discovered near a quantum critical point where magnetic order is suppressed to absolute zero temperature by strong quantum fluctuations. There have remained fundamental questions whether geometrica…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math> ferromagnetic Heisenberg chain in a verdazyl-based complex
ferromagnetic Heisenberg chain in a verdazyl-based complex Open
We present a model compound for the $S$=1/2 ferromagnetic Heisenberg chain composed of the verdazyl-based complex $[$Zn(hfac)$_2]$$[$4-Cl-$o$-Py-V-(4-F)$_2]$. $Ab$ $initio$ MO calculations indicate a predominant ferromagnetic interaction f…
View article: Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CeCoIn</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>
Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped Open
This paper demonstrates the anisotropic response of quantum critical\nfluctuations with respect to the direction of the magnetic field $B$ in\nNi-doped CeCoIn$_5$ by measuring the magnetization $M$ and specific heat $C$.\nThe results show …
View article: Unconventional Field-Induced Spin Gap in an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:mrow></mml:math> Chiral Staggered Chain
Unconventional Field-Induced Spin Gap in an Chiral Staggered Chain Open
We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain [Cu(pym)(H_{2}O)_{4}]SiF_{6}·H_{2}O (pym=pyrimidine). Electron-spin resonance, magnetometry and heat capacity measurements reveal the presence o…
View article: CCDC 1865094: Experimental Crystal Structure Determination
CCDC 1865094: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 1865093: Experimental Crystal Structure Determination
CCDC 1865093: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Field-induced quantum magnetism in the verdazyl-based charge-transfer salt<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mi>o</mml:mi><mml:mtext>−</mml:mtext><mml:mi>MePy</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant="normal">V</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>p</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Br</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mo>]</mml:mo></mml:mrow><mml:msub><mml:mi>FeCl</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Field-induced quantum magnetism in the verdazyl-based charge-transfer salt Open
We successfully synthesized a verdazyl-based charge-transfer salt\n$[$$o$-MePy-V-($p$-Br)$_2]$FeCl$_4$, which has an $S_{\\rm{V}}$=1/2 on the\nradical $o$-MePy-V-($p$-Br)$_2$ and an $S_{\\rm{Fe}}$=5/2 on the FeCl$_4$ anion.\n$Ab$ $initio$ …
View article: Magnetization study on the ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis
Magnetization study on the ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis Open
Dc magnetization measurements have been performed on the orthorhombic Ising ferromagnet URhGe with high-precision control of the magnetic field direction near the hard b axis.The ferromagnetic moment of this compound, which aligns along th…
View article: Field-enhanced quantum fluctuation in an <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math> frustrated square lattice
Field-enhanced quantum fluctuation in an frustrated square lattice Open
We present a new model compound with the S = 1/2 frustrated square lattice composed of the charge-transfer salt (o-MePy-V)PF6. Ab initio calculations indicate the formation of an S = 1/2 square lattice, in which six types of nearest-neighb…