Department office
Kita 10, Nisi 8, Kita-ku,
Sapporo 060-0810,
JAPAN TEL: +81(JPN)-11-706-2692
FAX +81(JPN)-11-706-4926
jimu*phys.sci.hokudai.ac.jp
(Replace "*" with "@" when sending email.)

Magnetism in Strongly Correlated Electron Systems

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Magnetism in Strongly Correlated Electron Systems I
(Very Low Temperature Group)

Investigating the Mysteries of Heavy Fermion Systems Using Very Low Temperature

Research Keywords

  • Very Low Temperature
  • High Magnetic Field
  • Physical Property Measurements under High Pressure
  • Ultrasonic Investigations of Electronic Property
  • Rare Earth and Actinide Compounds
  • Magnetism in Strongly Correlated Electron Systems
  • Heavy Electron Systems
  • Unconventional Superconductivity
  • Multipolar Ordering
  • Anomalous Non-Fermi Liquid Behavior

Research Interest

Solid State Physics

Research Theme

  • Magnetic Properties and Superconductivity in the f-electron Compounds
  • Study of Quantum Critical Phenomena Using High Pressure at Very Low Temperature
  • Ultrasonic Investigation of Local Charge Fluctuation

Research Activities

Our group investigates magnetic properties of 4f- and 5f-electron compounds with particular interest in the heavy-electron (heavy-fermion) systems, using very-low-temperature experimental techniques and microscopic measurements such as neutron scattering and muSR. The heavy-electron systems are the inter-metallic compounds, which contain elements of the rare earths (Ce, Pr, Yb, etc.) or actinides (U, Np, etc.) and behave as Landau’s Fermi liquids with quasiparticles whose effective masses are two to three orders of magnitudes larger than in ordinary metals. Such electronic states basically result from the hybridization effects that couple the 4f- or 5f- orbital levels of the lanthanide or actinide ions with the conduction states. A blend of this “c-f hybridization” and characteristics of local f orbits in compounds leads to a wide variety of non-trivial aspects of strongly correlated electrons at low temperatures. The heavy-electron compound was first recognized in CeAl3 in 1975, and drew the interests of many physicists by the discovery of superconductivity in CeCu2Si2 four years later. Since then, this research field has been providing a vast amount of new interesting materials and physics, most of which still deserve further investigations. Research on the heavy-electron compounds by our group started 1987, and presently focuses on the issues expressed by the keywords: weak antiferromagnetism, hidden order, anisotropic superconductivity, non-Fermi-liquid behavior, quantum criticality, quadrupole order, metamagnetism, etc.

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Argon arc-melting of uranium compound,
viewed through a viewing port of furnace.

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Setting up the 3He cryostat (≧ 200 mK).

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Setting up the Faraday-force magnetometer
on 3He-4He dilution refrigerator (≧ 10 mK).

 

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Hiroshi AMITSUKA Professor

Organization Departments of Physics, Faculty of Science

Division Department of Condensed Matter Physics

Tatsuya YANAGISAWA Associate Professor

Organization Departments of Physics, Faculty of Science

Division Department of Condensed Matter Physics

Hiroyuki HIDAKA Assistant Professor

Organization Departments of Physics, Faculty of Science

Division Department of Condensed Matter Physics

Contact

amiami*phys.sci.hokudai.ac.jp

(Replace "*" with "@" when sending email.)

Laboratory Website

http://phys.sci.hokudai.ac.jp/LABS/kyokutei/vlttop_j.html

Address

ZIP Code 060-0810

Address Kita 10, Nisi 8, Kita-ku, Sapporo 060-0810, JAPAN 

TEL +81(JPN)-11-706-3500

FAX +81(JPN)-11-706-4926

 

 

 

Magnetism in Strongly Correlated Electron Systems II
(Surface Magnetism Group / Spin and nano physics group)

Challenge to the novel spin physics of invisible nano world

Research Keywords

  • spin
  • nano
  • surface
  • thin film
  • Spin-Polarized Scanning Electron Microscope (Spin SEM)
  • Spin-Polarized Scanning Tunneling Microscope (SP-STM)
  • Spin-Polarized Spectroscope

Research Interest

nano magnetism

Research Activities

We are doing researches on magnetism and electron spin physics of solids, mainly for the surfaces, ultra-thin films, and nano-structured materials, where the key words are “spin” and “nano”. When materials become smaller or thinner, there appear novel magnetic and spin-related properties, because of the broken symmetry. In the experiments, we are using Spin-Polarized Scanning Electron Microscope (Spin SEM), Spin-Polarized Scanning Tunneling Microscope (STM), Spin-Polarized Spectroscope, 4 Probe with SEM/STM, Physical Property Measurement System etc, which we developed or modified for our own use.
 

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Kazuyuki KOIKE Professor

Organization Departments of Physics, Faculty of Science

Division Department of Condensed Matter Physics

Hideo MATSUMAYA Associate Professor

Organization Departments of Physics, Faculty of Science

Division Department of Condensed Matter Physics

Contact

koike*phys.sci.hokudai.ac.jp

(Replace "*" with "@" when sending email.)

Laboratory Website

http://phys.sci.hokudai.ac.jp/LABS/kyokutei/koike/en/index.html

Address

ZIP Code 060-0810

Address Kita 10, Nisi 8, Kita-ku, Sapporo 060-0810, JAPAN 

TEL +81(JPN)-11-706-2685