* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Searching for the Field-Induced Non-Magnetic Phase - ICAM
Nitrogen-vacancy center wikipedia , lookup
Renormalization wikipedia , lookup
Atomic orbital wikipedia , lookup
Quantum electrodynamics wikipedia , lookup
Renormalization group wikipedia , lookup
Many-worlds interpretation wikipedia , lookup
Theoretical and experimental justification for the Schrödinger equation wikipedia , lookup
Quantum fiction wikipedia , lookup
Orchestrated objective reduction wikipedia , lookup
Quantum computing wikipedia , lookup
Magnetic monopole wikipedia , lookup
Symmetry in quantum mechanics wikipedia , lookup
Quantum field theory wikipedia , lookup
Hydrogen atom wikipedia , lookup
Coherent states wikipedia , lookup
Quantum teleportation wikipedia , lookup
Scalar field theory wikipedia , lookup
EPR paradox wikipedia , lookup
Interpretations of quantum mechanics wikipedia , lookup
Quantum machine learning wikipedia , lookup
Quantum key distribution wikipedia , lookup
Electron configuration wikipedia , lookup
Quantum group wikipedia , lookup
Magnetoreception wikipedia , lookup
Hidden variable theory wikipedia , lookup
Quantum state wikipedia , lookup
Canonical quantization wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Searching for the Field-Induced Non-Magnetic Phase Transition and the Quantum Criticality Yasuyuki SHIMURA Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan, National High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, USA In the strongly correlated electron systems, quantum phase transition realized at ~ 0 K can be induced by magnetic field, pressure or chemical substitution. In the vicinity of the transition point between magnetic ordered phases and paramagnetic phase, quantum critical behavior like non-Fermi liquid behavior and/or heavy fermion superconductivity have been observed. The quantum phase transition without magnetic instability also exists like valence transition, orbital (quadrupolar) transition, and so on. However the quantum criticality has not been clarified well. Novel phenomena induced by strong hybridization between quadrupolar moments and conduction electrons have attracted recent intensive attention. One of the promising compound for the study is the cubic caged compound PrV2Al20, which has a strong hybridization between conduction electrons and the 4f- non-magnetic ground doublet having only orbital moments [1]. In fact, anomalous metallic state emerges owing to the putative “two-channel” Kondo effect using the orbital moments (electric quadrupole moments). Below the antiferro-quadrupole (AFQ) ordering temperature of T Q = 0.6 K [1,2], PrV2Al20 exhibits the heavy-fermion superconductivity with a strongly enhanced effective mass (m * ~ 140 m 0) at T SC = 0.05 K [3]. Recently, we have measured the magnetoresistance in PrV2Al20 down to 0.4 K up to 31 T for H // [111] [4]. The AFQ phase is found to be suppressed by the strong magnetic field at H c ~ 11 T. In the vicinity of the critical field, the temperature dependence of the resistivity shows sub-linear T-dependence, clearly deviated from the Fermi-liquid behavior. This is the first observation of the field-induced quadrupolar quantum criticality. In addition, we found the heavy-cyclotron effective mass up to m*/m0 ~ 10 from the Shubnikov-de Haas Oscillation. In this presentation, we will discuss the field-induced quantum criticality due to the quadrupole moments in PrV2Al20. If we have a time, I will also talk about the recent results of the intermediate valence compounds a-YbAlB4 isostructural to the Yb-based heavy fermion superconductor b-YbAlB4 under high magnetic field and pressure [5]. [1] A. Sakai and S. Nakatsuji, J. Phys. Soc. Jpn. 80, 063701 (2011). [2] Y. Shimura, Y. Ohta, T. Sakakibara, A. Sakai and S. Nakatsuji, J. Phys. Soc. Jpn. 82, 043705 (2013). [3] M. Tsujimoto, Y, Matsumoto, T. Tomita, A. Sakai, and S. Nakatsuji, Phys. Rev. Lett. 113, 267001 (2014). [4] Y. Shimura, M. Tsujimoto, B. Zeng, L. Balicas, A. Sakai, and S. Nakatsuji, arXiv:1412.4120 (2014). [5] Y. Matsumoto et al., Science 331, 316 (2011).