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Journal Articles

Gradual development of $$Gamma^{5g}$$ antiferromagnetic moment in the giant negative thermal expansion material Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N ($$xsim$$ 0.5)

Kodama, Katsuaki; Iikubo, Satoshi*; Takenaka, Koshi*; Takigawa, Masashi*; Takagi, Hidenori*; Shamoto, Shinichi

Physical Review B, 81(22), p.224419_1 - 224419_8, 2010/06

https://doi.org/10.1103/PhysRevB.81.224419
 Times Cited Count：45 Percentile：81.05(Materials Science, Multidisciplinary)

Journal Articles

Local lattice distortion in the giant negative thermal expansion material Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N

Iikubo, Satoshi*; Kodama, Katsuaki; Takenaka, Koshi*; Takagi, Hidenori*; Takigawa, Masashi*; Shamoto, Shinichi

Physical Review Letters, 101(20), p.205901_1 - 205901_4, 2008/11

https://doi.org/10.1103/PhysRevLett.101.205901
 Times Cited Count：186 Percentile：96.70(Physics, Multidisciplinary)

Giant negative thermal expansion is achieved in antiperovskite manganese nitrides when the sharp volume change associated with magnetic ordering is broadened by substitution. In this Letter, we address the unique role of the "magic" element, Ge, for such broadening in Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N. We present evidence for a local lattice distortion well described by the low-temperature tetragonal (${it T$_{4}$}$) structure of Mn$$_3$$GeN for a range of $$x$$, where the overall structure remains cubic. This structural instability shows a strong correlation with the broadness of the growth of the ordered magnetic moment and, hence, is considered to trigger the broadening of the volume change.

Journal Articles

Field-induced magnetic order and simultaneous lattice deformation in TlCuCl$$_3$$

Vyaselev, O.*; Takigawa, Masashi*; Vasiliev, A.*; Osawa, Akira; Tanaka, Hidekazu*

Physical Review Letters, 92(20), p.207202_1 - 207202_4, 2004/05

https://doi.org/10.1103/PhysRevLett.92.207202
 Times Cited Count：37 Percentile：78.57(Physics, Multidisciplinary)

We report the results of Cu and Cl nuclear magnetic resonance experiments and thermal expansion measurements in magnetic fields in the coupled dimer spin system TlCuCl$$_3$$. We found that the field-induced antiferromagnetic transition as confirmed by the splitting of NMR lines is slightly discontinuous. The abrupt change of the electric field gradient at the Cl sites, as well as the sizable change of the lattice constants, across the phase boundary indicate that the magnetic order is accompanied by simultaneous lattice deformation. These results suggest the importance of the spin-lattice correlations in this system.

Journal Articles

$$^{171}$$Yb NMR in the Kondo semiconductor YbB$$_{12}$$

Ikushima, Kenji; Kato, Y.*; Takigawa, Masashi*; Iga, Fumitoshi*; Hiura, Sayaka*; Takabatake, Toshiro*

Physica B; Condensed Matter, 281-282, p.274 - 275, 2000/06

https://doi.org/10.1016/S0921-4526(99)00815-7
 Times Cited Count：24 Percentile：72.45(Physics, Condensed Matter)

no abstracts in English

Oral presentation

NMR study on Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N with large negative thermal expansion

Kodama, Katsuaki; Takigawa, Masashi*; Iikubo, Satoshi; Takenaka, Koshi*; Takagi, Hidenori*; Shamoto, Shinichi

no journal, , 

Anti-peroveskite system Mn$$_3$$Cu$$_{1-x}$$Ge$$_x$$N exhibits a sharp volume expansion due to the magneto-volume effect at $$xsim0.15$$. With increasing $$x$$, the magneto-volume effect is broadened against temperature $$T$$, and as a result, the volume expansion becomes almost linear to $$T$$ and the system has a giant negative thermal expansion coefficient arround room temperature, at $$xsim 0.5$$. Such broadening of the magneto-volume effect may be due to the competitation between $$Gamma^{5g}$$- and $$Gamma^{4g}$$-type antiferromagnetic structures. Then we have performed $$^{14}$$N-NMR on Mn$$_3$$Cu$$_{0.6}$$Ge$$_{0.4}$$N in order to investigate the origin of the broadening of the magneto-volume effect. The experimental results show that $$Gamma^{4g}$$-type antiferromagnetic structre does not exist and $$Gamma^{5g}$$-type antiferromagnetic ordered moment continuously increases with decreasing $$T$$.

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