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Publications (17)

cond-mat.str-el2009

Magnetic-field dependence of antiferromagnetic structure in CeRh1-xCoxIn5

M. Yokoyama, Y. Ikeda, I. Kawasaki +4

We investigated effects of magnetic field H on antiferromagnetic (AF) structures in CeRh_{1-x}Co_xIn_5 by performing the elastic neutron scattering measurements. By applying H alon…

cond-mat.str-el2008

Change of Antiferromagnetic Structure near a Quantum Critical Point in CeRh1-xCoxIn5

M. Yokoyama, N. Oyama, H. Amitsuka +6

The elastic neutron scattering experiments were carried out on the solid solutions CeRh_{1-x}Co_xIn_5 to clarify the nature of the antiferromagnetic (AF) state in the vicinity of t…

cond-mat.str-el2002

Magnetic-Field Induced Quantum Critical Point in YbRh $_{2}$ Si $_{2}$

P. Gegenwart, J. Custers, C. Geibel +5

We report low-temperature calorimetric, magnetic and resistivity measurements on the antiferromagnetic (AF) heavy-fermion metal YbRh $_{2}$ Si $_{2}$ ( $T_{N} =$ 70 mK) as a function of ma…

cond-mat.str-el2002

Divergence of the Heavy Quasiparticle Mass at the Antiferromagnetic Quantum Critical Point in YbRh_2Si_2

P. Gegenwart, J. Custers, T. Tayama +4

We report low temperature specific heat, C, magnetization, M, susceptibility, chi, and electrical resistivity, rho, measurements on high-quality single crystals of the heavy-fermio…

cond-mat.str-el2005

Competition between hidden order and antiferromagnetism in URu_2Si_2 under uniaxial stress studied by neutron scattering

M. Yokoyama, H. Amitsuka, K. Tenya +4

We have performed elastic neutron scattering experiments under uniaxial stress sigma applied along the tetragonal [100], [110] and [001] directions for the heavy electron compound…

cond-mat.supr-con2009

Parity Violation in a Single Domain of Spin-Triplet Sr2RuO4 Superconductors

H. Nobukane, K. Inagaki, K. Ichimura +8

We observed an unconventional parity-violating vortex in single domain Sr2RuO4 single crystals using a transport measurement. The current-voltage characteristics of submicron Sr2Ru…

cond-mat.str-el2003

Tuning Heavy Fermion Systems into Quantum Criticality by Magnetic Field

P. Gegenwart, J. Custers, T. Tayama +8

We discuss a series of thermodynamic, magnetic and electrical transport experiments on the two heavy fermion compounds CeNi2Ge2 and YbRh2Si2 in which magnetic fields, B, are used t…

cond-mat.str-el2019

Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5

M. Yokoyama, K. Suzuki, K. Tenya +4

This paper demonstrates the anisotropic response of quantum critical fluctuations with respect to the direction of the magnetic field $B$ in Ni-doped CeCoIn $_{5}$ by measuring the ma…

cond-mat.str-el2017

Observation of a new field-induced phase transition and its concomitant quantum critical fluctuations in CeCo(In $_{1 - x}$ Zn $_{x}$ ) $_{5}$

M. Yokoyama, H. Mashiko, R. Otaka +10

We demonstrate a close connection between observed field-induced antiferromagnetic (AFM) order and quantum critical fluctuation (QCF) in the Zn7%-doped heavy-fermion superconductor…

cond-mat.str-el2012

Low-temperature specific heat for ferromagnetic and antiferromagnetic orders in CaRu1-xMnxO3

M. Yokoyama, S. Nakano, S. Someya +7

Low-temperature specific heat of CaRu1-xMnxO3 was measured to clarify the role of d electrons in ferromagnetic and antiferromagnetic orders observed above x=0.2. Specific heat divi…

cond-mat.str-el2003

Neutron Scattering Study on Competition between Hidden Order and Antiferromagnetism in U(Ru_{1-x}Rh_x)_2Si_2 (x <= 0.05)

M. Yokoyama, H. Amitsuka, S. Itoh +3

We have performed elastic and inelastic neutron scattering experiments on the solid solutions U(Ru_{1-x}Rh_x)_2Si_2 for the Ru rich concentrations: x=0, 0.01, 0.02, 0.025, 0.03, 0.…

cond-mat.str-el2007

Polarized neutron scattering study on antiferromagnetic states in CeRh0.6Co0.4In5

M. Yokoyama, N. Oyama, H. Amitsuka +5

Polarized neutron scattering experiments were performed on mixed compound CeRh0.6Co0.4In5 to clarify the nature of the low-temperature ordered states. Three nonequivalent Bragg pea…

cond-mat.str-el2006

New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh0.6Co0.4In5

M. Yokoyama, H. Amitsuka, K. Matsuda +5

We performed elastic neutron scattering experiments on solid solution CeRh1-xCoxIn5 with x=0.4 to clarify the nature of the antiferromagnetic (AF) phase in the vicinity of the quan…

cond-mat.str-el2012

Neutron Scattering Study on Commensurate and Incommensurate Antiferromagnetic Phases in UPd2Si2 under Uniaxial Stress

T. Nakada, M. Yokoyama, C. Tabata +5

The nature of competition between incommensurate (IC) and commensurate (C) antiferromagnetic (AF) orders in UPd2Si2 was investigated by performing elastic neutron scattering experi…

cond-mat.str-el2006

Pressure-temperature phase diagram of the heavy-electron superconductor URu2Si2

H. Amitsuka, K. Matsuda, I. Kawasaki +7

The pressure-temperature phase diagram of the heavy-electron superconductor URu2Si2 has been reinvestigated by ac-susceptibility and elastic neutron-scattering (NS) measurements pe…

cond-mat.str-el2004

Magnetic Excitations in U(Ru_{1-x}Rh_x)_2Si_2 (x<=0.03)