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Multiple Superconducting Phases under Pressure for Different Field Directions in UTe2
Dai Aoki, Atsushi Miyake, Ai Nakamura +7
The existence of multiple superconducting phases is a striking feature of UTe2, arising from the spin and orbital degrees of freedom and supporting a spin-triplet superconducting s…
Hall effect on nontrivial quadrupole order in quasi-kagome compound URhSn
Yusei Shimizu, Arvind Maurya, Yoshiya Homma +6
This study focuses on the transport properties of the quasi-kagome compound URhSn, which exhibits successive phase transitions at TC =16 K (ferromagnetic phase) and TO =54 K (inter…
Novel Easy-Axis Switching through Metamagnetism in CeSb
Atsushi Miyake, Ryuta Hayasaka, Hiroto Fukuda +9
A novel magnetic field-induced switching of the magnetization easy axis has been discovered in the layered compound CeSb, which crystallizes in an orthorhombic structure with n…
Piezomagnetism in the Ising ferromagnet URhGe
Mikiya Tomikawa, Ryo Araki, Atsutoshi Ikeda +4
Piezomagnetism, linear response between strain and magnetic field, is relatively unexplored cross-correlation but has promising potential as a novel probe of time-reversal-symmetry…
Fermi surface topology and electronic transport properties of a chiral crystal NbGe with strong electron-phonon interaction
Yoshiki J. Sato, Ai Nakamura, Rei Nishinakayama +3
We report the electronic structures and transport properties of a chiral crystal NbGe, which is a candidate for a coupled electron-phonon liquid. The electrical resistivity and…
Impact of the Ce states in the electronic structure of the intermediate-valence superconductor CeIr
Shin-ichi Fujimori, Ikuto Kawasaki, Yukiharu Takeda +10
The electronic structure of the -based superconductor was studied by photoelectron spectroscopy. The energy distribution of the states were re…
Emergence of Elastic Softening Featuring Ultra-Slow Dynamics Around Magnetic Critical Endpoint in UCoAl
Masahito Yoshizawa, Yusei Shimizu, Yoshiki Nakanishi +4
We conducted an investigation on the temperature and magnetic field dependence of the elastic properties of UCoAl. The longitudinal elastic stiffness, , exhibits significan…
Monoaxial Dzyaloshinskii-Moriya interaction-induced topological Hall effect in a new chiral-lattice magnet GdPtB
Yoshiki J. Sato, Hikari Manako, Ryuji Okazaki +3
We investigate the topological Hall effect (THE) in the monoaxial chiral crystal GdPtB, a recently discovered compound that exhibits putative helimagnetism below 87 K. The dist…
Unraveling the magnetic structure of YbNiSn single crystal via crystal growth and neutron diffraction
Hung-Cheng Wu, Ai Nakamura, Daisuke Okuyama +3
Neutron and x-ray diffraction experiments were performed on the ternary intermetallic compound YbNiSn, formerly categorized as a ferromagnetic Kondo compound. At zero field, an inc…
First Observation of de Haas-van Alphen Effect and Fermi Surfaces in Unconventional Superconductor UTe2
Dai Aoki, Hironori Sakai, Petr Opletal +11
We report the first observation of the de Haas-van Alphen (dHvA) effect in the novel spin-triplet superconductor UTe2 using high quality single crystals with the high residual resi…
Analysis of the unconventional chiral fermions in a non-centrosymmetric chiral crystal
Vikas Saini, Souvik Sasmal, Ruta Kulkarni +2
Symmetry-protected non-trivial states in chiral topological materials hold immense potential for fundamental science and technological advances. Here, we report electrical transpor…
Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe
Atsushi Miyake, Masaki Gen, Akihiko Ikeda +10
The link between the metamagnetic transition and novel spin-triplet superconductivity of UTe was discussed thermodynamically through magnetostriction measurements in a pulsed-m…
Slow Electronic Dynamics in the Paramagnetic State of UTe
Yo Tokunaga, Hironori Sakai, Shinsaku Kambe +13
Te NMR experiments in field () applied along the easy magnetization axis (the -axis) revealed slow electronic dynamics developing in the paramagnetic state of UTe…
Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
Dexin Li, Ai Nakamura, Fuminori Honda +8
We report the magnetic susceptibility and the magnetization under pressures up to 1.7GPa above the critical pressure, Pc ~ 1.5GPa, for H // a, b, c-axes in the novel spin triplet s…
Charge-Density-Wave Order and Multiple Magnetic Transitions in Divalent Europium Compound EuAl
Koji Kaneko, Takuro Kawasaki, Koji Munakata +7
Multiple transition phenomena in divalent Eu compound EuAl with the tetragonal structure were investigated via the single-crystal time-of-flight neutron Laue technique. At 30.0…
Field-Induced Superconductivity near the Superconducting Critical Pressure in UTe2
Dai Aoki, Motoi Kimata, Yoshiki J. Sato +12
We report the magnetoresistance in the novel spin-triplet superconductor UTe2 under pressure close to the critical pressure Pc, where the superconducting phase terminates, for fiel…
Pressure induced multicriticality and electronic instability in quasi-kagome ferromagnet URhSn
Arvind Maurya, Dilip Bhoi, Fuminori Honda +9
We report an unconventional class of pressure induced quantum phase transition, possessing two bicritical points at 6.25 GPa in URhSn. This unique transformation accompanies a Ferm…
Core-Level Photoelectron Spectroscopy Study of UTe
Shin-ichi Fujimori, Ikuto Kawasaki, Yukiharu Takeda +4
The valence state of UTe was studied by core-level photoelectron spectroscopy. The main peak position of the U core-level spectrum of UTe coincides with that of UB…
Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
Dai Aoki, Fuminori Honda, Georg Knebel +8
We performed AC calorimetry and magnetoresistance measurements under pressure for H || a-axis (easy-magnetization axis) in the novel heavy-fermion superconductor UTe2. Thanks to th…
Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors
Dai Aoki, Ai Nakamura, Fuminori Honda +13
The spin-triplet state is most likely realized in uranium ferromagnetic superconductors, UGe2, URhGe, UCoGe. The microscopic coexistence of ferromagnetism and superconductivity mea…
Electronic Structure of UTe Studied by Photoelectron Spectroscopy
Shin-ichi Fujimori, Ikuto Kawasaki, Yukiharu Takeda +4
The electronic structure of the unconventional superconductor UTe was studied by resonant photoelectron spectroscopy (RPES) and angle-resolved photoelectron spectroscopy (ARPES…
125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
Yo Tokunaga, Hironori Sakai, Shinsaku Kambe +11
We report 125Te-NMR studies on a newly discovered heavy fermion superconductor UTe2. Using a single crystal, we have measured the 125Te-NMR Knight shift K and spin-lattice relaxati…
Metamagnetic Transition in Heavy Fermion Superconductor UTe2
Atsushi Miyake, Yusei Shimizu, Yoshiki J. Sato +7
We have studied the magnetization of the recently discovered heavy fermion superconductor UTe up to 56 T in pulsed-magnetic fields. A first-order metamagnetic transition has be…
Unconventional Superconductivity in Heavy Fermion UTe2
Dai Aoki, Ai Nakamura, Fuminori Honda +13
We grew single crystals of the recently discovered heavy fermion superconductor UTe2, and measured the resistivity, specific heat and magnetoresistance. Superconductivity (SC) was…