Magnetic Materials Laboratory

We explore a wide variety of electronic phases formed by strongly interacting electrons (strongly correlated electrons) and the physics behind. The topics include exotic superconductivity, quantum magnetism and metal-insulator transitions. Our playgrounds are in transition metal oxides and rare earth intermetallic where d-electrons and f-electrons dominate the electronic properties. We will be working on properties and functions related with not only magnetism but also a novel spin-charge-lattice coupled phenomena. Development of local probes for magnetism and electronic states are also in progress.

Research Subjects

• Strongly correlated electron systems-novel materials and functions
• Nano-scale characterization of strongly-correlated electron systems
• Development of an advanced measurement system for novel electronic states
• Quantum magnetism

Publications

1. Y. Shimizu, H. Takeda, M. Tanaka, M. Itoh, S. Niitaka, and H. Takagi:
   "An orbital-selective spin liquid in a frustrated heavy fermion spinel LiV2O4"
   Nature Communications 3, 981 (2012)
2. S. Fujiyama, H. Ohsumi, T. Komesu, J. Matsuno, B.J. Kim, M. Takata, T. Arima, and H. Takagi:
   "Two-Dimensional Heisenberg Behavior of Jeff = 1/2 Isospins in the Paramagnetic State of the Spin-Orbital Mott Insulator Sr2IrO4"
   Physical Review Letters 108, 247212 (2012)
3. T. Hanaguri, K. Kitagawa, K. Matsubayashi, Y. Mazaki, Y. Uwatoko, and H. Takagi:
   "Scanning tunneling microscopy/spectroscopy of vortices in LiFeAs"
   Physical Review B 85, 214505 (2012)
4. K. Ishii, I. Jarrige, M. Yoshida, K. Ikeuchi, J. Mizuki, K. Ohashi, T. Takayama, J. Matsuno, and H. Takagi:
   "Momentum-resolved electronic excitations in the Mott insulator Sr2IrO4 studied by resonant inelastic x-ray scattering"
   Physical Review B 83, 115121 (2011)
5. T. Hanguri et al.:
   "Unconventional s-Wave Superconductivity in Fe(Se,Te)"
   Science 328, 474 (2010)
6. H. Kuriyama et al.:
   "Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site"
   Appl. Phys. Lett. 96, 182103 (2010)
7. T. Hanaguri et al.:
   "Momentum-resolved Landau-level spectroscopy of Dirac surface state in Bi2Se3"
   Phys. Rev. B 82, 081305(R) (2010)
8. B.J. Kim et al.:
   "Phase-sensitive observation of a spin-orbital Mott state in Sr2IrO4"
   Science 323, 1329 (2009)
9. K. Takenaka et al.:
   "Conversion of magnetic structure by slight dopants in geometrically frustrated antiperovskite Mn3GaN"
   Appl. Phys. Lett. 95, 132508 (2009)
10. T. Hanaguri et al.:
    "Coherence Factors in a High-Tc Cuprate Probed by Quasi-particle Scattering off Vortices"
    Science 323, 923 (2009)