S. Araki

New Superconducting and Magnetic Phases Emerge on the Magnetic Criticality in CeIn3

We report the discovery of new superconducting and novel magnetic phases in CeIn 3 on the verge of antiferromagnetism (AFM) under pressure ( P ) through the In-nuclear quadrupole resonance (NQR) measurements. We have found a P -induced phase separation of AFM and paramagnetism (PM) without any trace of a quantum phase transition in CeIn 3 . A new type of superconductivity (SC) was found, under P =2.28–2.5 GPa, to coexist with AFM. It is magnetically separated from PM where the heavy fermion SC takes place. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs.

A change of the Fermi surface in UGe2 across the critical pressure

We carried out the de Haas-van Alphen (dHvA) experiment under pressure for a ferromagnet UGe2. The dHvA frequency of a main dHvA branch named α, that corresponds to a majority up-spin band 40-hole Fermi surface, decreases monotonously with increasing pressure, but in the pressure range from pc* (1.2 GPa) to pc (1.5 GPa) the dHvA signal disappears completely, where pc and pc* correspond to critical pressures for a Curie temperature TC and the second phase transition temperature T* ( pc we observed new dHvA branches with large cyclotron masses of 19-64m0, which correspond to main Fermi surfaces in the paramagnetic state.

Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn 3 : An In 115 -NQR study under pressure

We report on pressure-induced unconventional superconductivity (SC) in the heavy-fermion (HF) antiferromagnet

A change of the Fermi surface across the metamagnetic transition under pressure in UGe2

{\mathrm{CeIn}}_{3}

Metamagnetic transition of CeRh2Si2 under high fields and high pressures at various temperatures

by means of nuclear-quadrupole-resonance (NQR) studies conducted under a high pressure. The temperature

De Haas–van Alphen effect in CeNi under pressure

(T)

Metamagnetism in PrCu2 based on the quadrupole moment

and pressure

Heavy electron mass and the Kondo effect in PrSn3

(P)

Anisotropic ferroquadrupolar phase in magnetic fields for PrCu2

dependences of the In-NQR spectra have revealed a first-order quantum-phase transition (QPT) from antiferromagnetism (AFM) to paramagnetism (PM) at a critical pressure

Crystalline electric field excitations in CeAgSb2

{P}_{\mathrm{c}}=2.46\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}