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Journal Articles

Spin-orbital short-range order on a honeycomb-based lattice

Nakatsuji, Satoru*; Kuga, Kentaro*; Kimura, Kenta*; Satake, Ryuta*; Katayama, Naoyuki*; Nishibori, Eiji*; Sawa, Hiroshi*; Ishii, Rieko*; Hagiwara, Masayuki*; Bridges, F.*; et al.

Science, 336(6081), p.559 - 563, 2012/05

 Times Cited Count:108 Percentile:95.76(Multidisciplinary Sciences)

Frustrated magnetic materials can remain disordered to the lowest temperatures. Such is the case for Ba$$_3$$CuSb$$_2$$O$$_9$$, which is magnetically anisotropic at the atomic scale but curiously isotropic on mesoscopic length and time scales. We find that the frustration on the triangular lattice is imprinted in a nanostructured honeycomb lattice of Cu$$^{2+}$$ ions that resists a coherent static Jahn-Teller distortion. The resulting two-dimensional random-bond spin-1/2 system on the honeycomb lattice has a broad spectrum of spin-dimer like excitations and low-energy spin degrees of freedom that retain.

Oral presentation

Magnetic properties of the spinel AYb$$_2$$S$$_4$$ (A = Cd, Mg) probed by $$mu$$SR

Higemoto, Wataru; Ito, Takashi; Koda, Akihiro*; Iritani, Kenshi*; Halim, M.*; Nakatsuji, Satoru*

no journal, , 

Varieties of magnetic states are seen in spinel structural magnets due to spin frustration effect. In particular, much attention is paid on recent study on pyrochlore structural magnet with rare-earth elements because interesting spin state, spin ice or other state, is observed. We have studied on spinel magnet AYb$$_2$$S$$_4$$ to clarify the magnetic ground state by means of muon spin relaxation method. In our measurement, static magnetic ordering state was clearly observed.

Oral presentation

Magnetic properties of the spinel AYb$$_2$$Se$$_4$$ (A=Cd, Mg) probed by $$mu$$SR

Higemoto, Wataru; Ito, Takashi; Iritani, Kenshi*; Halim, M.*; Nakatsuji, Satoru*

no journal, , 

A spinel structural system shows a variety of the magnetic state due to its frustration effect. Up to now, we have studied the magnetic ground state of spinel structural system AYb$$_2$$S$$_4$$(A=Cd, Mg) by using muon spin relaxation method and observed the appearance of the magnetic ordering state below 2K in CdYb$$_2$$S$$_4$$ and 1.5K in MgYb$$_2$$S$$_4$$. For systematic study of the frustration effect, we are measuring muon spin relaxation in same structural compounds AYb$$_2$$Se$$_4$$ (A=Cd, Mg). In CdYb$$_2$$Se$$_4$$, the local magnetic field was observed below 2K. In the presentation, we will discuss the detail of the magnetic state.

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