Publications (11)
Quadrupole-Driven Non-Fermi Liquid and Magnetic-Field Induced Heavy Fermion States in a Non-Kramers Doublet System
T. Onimaru, K. Izawa, K. T. Matsumoto +9
Orbital degrees of freedom in condensed matters could play important roles in forming a variety of exotic electronic states by interacting with conduction electrons. In 4f electron…
Enhanced quasiparticle heat conduction of the multigap superconductor Lu2Fe3Si5
Y. Machida, S. Sakai, K. Izawa +2
The thermal transport measurements have been made on the Fe-based superconductor Lu2Fe3Si5 (Tc ~ 6 K) down to a very low temperature Tc/120. The field and temperature dependences o…
Possible Sign-Reversing s-Wave Superconductivity in Co-Doped BaFe2As2 Proved by Thermal Transport Measurements
Y. Machida, K. Tomokuni, T. Isono +3
Thermal transport measurements have been performed on single-crystalline Co-doped BaFe2As2 down to 0.1 K and under magnetic fields up to 7 T. Significant peak anomalies are observe…
Intact Quasiparticles at an Unconventional Quantum Critical Point
M. L. Sutherland, E. C. T. O'Farrell, W. H. Toews +6
We report measurements of in-plane electrical and thermal transport properties in the limit near the unconventional quantum critical point in the heavy-fermion me…
Twofold spontaneous symmetry breaking in a heavy fermion superconductor UPt
Y. Machida, A. Itoh, Y. So +7
The field-orientation dependent thermal conductivity of the heavy-fermion superconductor UPt was measured down to very low temperatures and under magnetic fields throughout thr…
Thermoelectric response near a quantum critical point of beta-YbAlB4 and YbRh2Si2: A comparative study
Y. Machida, K. Tomokuni, C. Ogura +7
The thermoelectric coefficients have been measured on the Yb-based heavy fermion compounds beta-YbAlB4 and YbRh2Si2 down to a very low temperature. We observe a striking difference…
Anisotropic hysteretic Hall-effect and magnetic control of chiral domains in the chiral spin states of PrIrO
L. Balicas, S. Nakatsuji, Y. Machida +1
We uncover a strong anisotropy in both the anomalous Hall effect (AHE) and the magnetoresistance of the chiral spin states of PrIrO. The AHE appearing below 1.5 K at ze…
Verification of the Wiedemann-Franz law in YbRh2Si2 at a quantum critical point
Y. Machida, K. Tomokuni, K. Izawa +4
The thermal conductivity measurements have been performed on the heavy-fermion compound YbRh2Si2 down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at…
Study of superconducting properties of MgB2
Y. Machida, S. Sasaki, H. Fujii +3
We synthesized single crystalline and policrystalline MgB_2 under ambient pressures. The single crystals of MgB_2 were of good quality, where the crystal structure refinements were…
Thermal conductivity through the quantum critical point in YbRh2Si2 at very low temperature
M. Taupin, G. Knebel, T. D. Matsuda +5
The thermal conductivity of YbRh2Si2 has been measured down to very low temperatures under field in the basal plane. An additional channel for heat transport appears below 30 mK, b…
Weak quasistatic magnetism in the frustrated Kondo lattice Pr_2Ir_2O_7
D. E. MacLaughlin, Y. Ohta, Y. Machida +6
Muon spin relaxation experiments have been performed in the pyrochlore iridate Pr_2Ir_2O_7 for temperatures in the range 0.025-250 K. Kubo-Toyabe relaxation functions are observed…