53 citations · 301 across the 23 of their papers we have counts for
23 papers
Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
Iku Nakaaki, Aoi Hashimoto, Shun Kondo +11
Recently, we have reported that a highly disordered fractal MgO/MgB2 nanocomposite exhibits bulk-like superconducting properties with isotropic pinning, showing an excellent phase-…
Successive Antiferromagnetic Transition in the Frustrated Compound CeMgIn
Kou Onishi, Hitoshi Sugawara, Takahiro Sakurai +2
We report on the magnetic, transport, and thermal properties of the hexagonal ZrNiAl-type compound CeMgIn with Ce atoms forming a distorted kagome network. This compound exhibits s…
Pressure-tuned quantum criticality in the large- antiferromagnet DTN
Kirill Yu. Povarov, David E. Graf, Andreas Hauspurg +11
Strongly correlated spin systems can be driven to quantum critical points via various routes. In particular, gapped quantum antiferromagnets can undergo phase transitions into a ma…
Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
Nanami Teramachi, Aoi Hashimoto, Iku Nakaaki +10
The proximity effect in normal/superconductor heterostructures is an intriguing phenomenon in that the normal side takes on the properties of a superconductor with an induced gap.…
Continuous control of classical-quantum crossover by external high pressure in the coupled chain compound CsCuCl
Daisuke Yamamoto, Takahiro Sakurai, Ryosuke Okuto +4
In solid materials, the parameters relevant to quantum effects, such as the spin quantum number, are basically determined and fixed at the chemical synthesis, which makes it challe…
First ESR Detection of Higgs Amplitude Mode and Analysis with Extended Spin-Wave Theory in Dimer System KCuCl
Masashige Matsumoto, Takahiro Sakurai, Yuki Hirao +3
KCuCl is known to show a quantum phase transition from the disordered to antiferromagnetically ordered phases by applying pressure. There is a longitudinal excitation mode (Hig…
Pressure control of the magnetic anisotropy of the quasi-two-dimensional van der Waals ferromagnet CrGeTe
T. Sakurai, B. Rubrecht, L. T. Corredor +10
We report the results of the pressure-dependent measurements of the static magnetization and of the ferromagnetic resonance (FMR) of CrGeTe to address the properties of…
First-order phase transition to a nonmagnetic ground state in nonsymmorphic NbCrP
Yoshiki Kuwata, Hisashi Kotegawa, Hideki Tou +9
We report the discovery of a first-order phase transition at around 125 K in NbCrP, which is a nonsymmorphic crystal with Pnma space group. From the resistivity, magnetic susceptib…
Spontaneous vortex state in a superconductor/ferromagnet nanocomposite
Nanami Teramachi, Yusuke Seto, Takahiro Sakurai +2
The mechanism of the interplay between superconductivity and magnetism is one of the intriguing and challenging problems in physics. Theory has predicted that the ferromagnetic ord…
Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in MnP
H. Kotegawa, M. Matsuda, F. Ye +13
Antiferromagnet MnP with Neel temperature K is composed of Mn-tetrahedrons and zigzag chains formed by three inequivalent Mn sites. Due to the nearly frustrated lattic…
Magnetic correlations in the pressure-induced superconductor CrAs investigated by As nuclear magnetic resonance
Kei Matsushima, Hisashi Kotegawa, Yoshiki Kuwata +7
We report As-NMR results for CrAs under pressure, which shows superconductivity adjoining a helimagnetically ordered state. We successfully evaluated the Knight shift from t…
Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet CsCuCl
S. A. Zvyagin, D. Graf, T. Sakurai +6
Quantum triangular-lattice antiferromagnets are important prototype systems to investigate phenomena of the geometrical frustration in condensed matter. Apart from highly unusual m…
Superlattice formation lifting degeneracy protected by non-symmorphic symmetry through a metal-insulator transition in RuAs
Hisashi Kotegawa, Keiki Takeda, Yoshiki Kuwata +6
The single crystal of RuAs obtained by Bi-flux method shows obvious successive metal-insulator transitions at T_MI1~255 K and T_MI2~195$ K. The X-ray diffraction measurement reveal…
Direct Observation of the Quantum Phase Transition of SrCu(BO) by High-Pressure and Terahertz Electron Spin Resonance
Takahiro Sakurai, Yuki Hirao, Keigo Hijii +5
High-pressure and high-field electron spin resonance (ESR) measurements have been performed on a single crystal of the orthogonal-dimer spin system SrCu(BO). With…
Macroscale three-dimensional proximity effect in disordered normal/superconductor nanocomposites
Katsuya Ueno, Nobuhito Kokubo, Satoru Okayasu +8
Recently, interest in Superconductor (S)-Normal (N) interfaces was renewed by the observation of exotic proximity effects in various systems, including S/semiconductor, S/ferromagn…
Dzyaloshinsky-Moriya interaction and the ground state in S=3/2 perfect kagome lattice antiferromagnet (Cr-jarosite) studied by X-band and high-frequency ESR
Susumu Okubo, Ryohei Nakata, Hitoshi Ohta +9
A single crystal S=3/2 perfect kagome lattice antiferromagnet (Cr-jarosite) has been studied by X-band and high-frequency electron spin resonance (ES…
Frequency Extension to THz Range in High Pressure ESR System and Its Application to Shastry-Sutherland Model Compound SrCu(BO)
Hitoshi Ohta, Takahiro Sakurai, Ryosuke Matsui +7
We have made a survey of ceramics for the inner parts of the transmission-type pressure cell to achieve the high pressure and the high transmission in THz range. By using the optim…
Microscopic properties of degradation-free capped GdN thin films studied by Electron Spin Resonance
Tokuro Shimokawa, Yohei Fukuoka, Masashi Fujisawa +8
The microscopic magnetic properties of high-quality GdN thin films have been investigated by electron spin resonance (ESR) and ferromagnetic resonance (FMR) measurements. Detailed…
NaCuMoO_4(OH) as a Candidate Frustrated J_1-J_2 Chain Quantum Magnet
Kazuhiro Nawa, Yoshihiko Okamoto, Akira Matsuo +9
In a frustrated J_1-J_2 chain with the nearest-neighbor ferromagnetic interaction J_1 and the next-nearest-neighbor antiferromagnetic interaction J_2, novel magnetic states such as…
Nonmagnetic Impurity Effect of the S=1/2 Spin Ladder System (pipdH)_2Cu_{1-x}Zn_xBr_4
C. Yokoyama, E. Matsuoka, H. Sugawara +5
We report the synthesis and the magnetic susceptibility of (pipdH)2Cu1-xZnxBr4, which is a nonmagnetic impurity-doped S=1/2 spin ladder system. The samples were synthesized from a…
Enhancement of the superconducting transition temperature of MgB2 by proximity effect of d0 ferromagnet
Takashi Uchino, Kazuyuki Takahashi, Yuki Uenaka +9
Heterostructures of superconducting and ferromagnetic materials are of fundamental interest because of the mutual interaction of antagonistic kinds of ordering at the S-F interface…
Anomalous Spin Dynamics observed by High Frequency ESR in Honeycomb Lattice Antiferromagnet InCu2/3V1/3O3
Susumu Okubo, Hideo Wada, Hitoshi Ohta +5
High-frequency ESR results on the S=1/2 Heisenberg hexagonal antiferromagnet InCu2/3V1/3O3 are reported. This compound appears to be a rare model substance for the honeycomb lattic…
High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCuVO(OH)
Wei-min Zhang, Hitoshi Ohta, Susumu Okubo +5
High-field electron spin resonance (ESR) measurements have been performed on vesignieite BaCuVO(OH), which is considered as a nearly ideal model substance of =1/…