Anomalous Magnetic Properties of Honeycomb Lattice Compounds -Neutron Scattering-
| Project/Area Number |
20540333
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
YASUI Yukio Nagoya University, 理学研究科, 助教 (80345850)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SATO Masatoshi 名古屋大学, 理学研究科, 名誉教授 (40092225)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
|---|
| Keywords | ハニカム格子 / スピンギャップ / 中性子散乱 / 磁気構造 / 磁気励起 / 特異な磁性 |
|---|
| Research Abstract |
Anomalous magnetic behaviors of honeycomb lattice compound Na_3M_2SbO_6 and Na_2M_2TeO_6 (M=Cu, Ni and Co) have been investigated by means of neutron scattering and measurements of magnetic susceptibility x and specific heat C. For M=Cu, spin-gap behaviors have been observed in the temperature dependences of x and C. In order to extract information of an origin of the spin-gap, magnetic excitation spectra have been measured by neutron inelastic scattering on a single crystal of Na_3Cu_2SbO_6. From the intensity distribution and the dispersion curves of the excitations, we have evaluated the values of spin-gap and exchange interactions. The results of x and C data of Na_3Ni_2SbO_6, Na_3Co_2SbO_6, Na_2Ni_2TeO_6, and Na_2Co_2TeO_6 indicate that the spin systems exhibit an antiferromagnetic transition at TN=18K, 6K, 34K, and 25K, respectively. To investigate the magnetic structure of these systems, neutron diffraction studies have been carried out for the polycrystalline samples. We can determine the magnetic structure of Na_3Ni_2SbO_6, and Na_2Co_2TeO_6.
|
Report
(4 results)
Research Products
(69 results)
