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Journal Articles

Spin correlations of quantum spin liquid and quadrupole-ordered states of Tb$$_{2+x}$$Ti$$_{2-x}$$O$$_{7+y}$$

Kadowaki, Hiroaki*; Wakita, Mika*; F${aa}$k, B.*; Ollivier, J.*; Kawamura, Seiko; Nakajima, Kenji; Lynn, J. W.*

Physical Review B, 99(1), p.014406_1 - 014406_12, 2019/01

https://doi.org/10.1103/PhysRevB.99.014406
 Times Cited Count：9 Percentile：46.05(Materials Science, Multidisciplinary)

Spin correlations of the frustrated pyrochlore oxide Tb$$_{2+x}$$Ti$$_{2-x}$$O$$_{7+y}$$ have been investigated by using inelastic neutron scattering on single-crystalline samples (x = -0.007, 0.000, and 0.003), which have the putative quantum-spin-liquid (QSL) or electric-quadrupolar ground states. Spin correlations, which are notably observed in nominally elastic scattering, show short-range correlations around $$Gamma$$ points, tiny antiferromagnetic Bragg scattering at L and $$Gamma$$ points, and pinch-point-type structures around $$Gamma$$ points. The short-range spin correlations were analyzed using a random-phase approximation (RPA) assuming the paramagnetic state and two-spin interactions among Ising spins. These analyses have shown that the RPA scattering intensity well reproduces the experimental data using temperature- and x-dependent coupling constants of up to tenth-neighbor site pairs. This suggests that no symmetry breaking occurs in the QSL sample and that a quantum treatment beyond the semiclassical RPA approach is required. Implications of the experimental data and the RPA analyses are discussed.

Journal Articles

Continuum excitation and pseudospin wave in quantum spin-liquid and quadrupole ordered states of Tb$$_{2+x}$$Ti$$_{2-x}$$O$$_{7+y}$$

Kadowaki, Hiroaki*; Wakita, Mika*; F${aa}$k, B.*; Ollivier, J.*; Kawamura, Seiko; Nakajima, Kenji; Takatsu, Hiroshi*; Tamai, Mototake*

Journal of the Physical Society of Japan, 87(6), p.064704_1 - 064704_6, 2018/06

https://doi.org/10.7566/JPSJ.87.064704
 Times Cited Count：9 Percentile：57.38(Physics, Multidisciplinary)

The ground states of the frustrated pyrochlore oxide Tb$$_{2+x}$$Ti$$_{2-x}$$O$$_{7+y}$$ have been studied by inelastic neutron scattering experiments. Three single-crystal samples are investigated; one shows no phase transition ($$x = -0.007 < x_{c} < sim -0.0025$$), being a putative quantum spin-liquid (QSL), and the other two ($$x = 0.000, 0.003$$) show electric quadrupole ordering (QO) below $$T_{c} sim 0.5$$ K. The QSL sample shows continuum excitation spectra with an energy scale 0.1 meV as well as energy-resolution-limited (nominally) elastic scattering. As $$x$$ is increased, pseudospin wave of the QO state emerges from this continuum excitation, which agrees with that of powder samples and consequently verifies good $$x$$ control for the present single crystal samples.

Journal Articles

Neutron scattering investigation on quantum spin system SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Kakurai, Kazuhisa; Nukui, Katsuyuki*; Aso, Naofumi*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Kageyama, Hiroshi*; Ueda, Yutaka*; Regnault, L.-P.*; C$'e$pas, O.*

Progress of Theoretical Physics Supplement, (159), p.22 - 32, 2005/10

no abstracts in English

Journal Articles

High energy-resolution inelastic neutron scattering experiments on triplet bound state excitations in SrCu$$_{2}$$(BO$$_{3}$$)$$_{2}$$

Aso, Naofumi*; Kageyama, Hiroshi*; Nukui, Katsuyuki*; Nishi, Masakazu*; Kadowaki, Hiroaki*; Ueda, Yutaka*; Kakurai, Kazuhisa

Journal of the Physical Society of Japan, 74(8), p.2189 - 2192, 2005/08

https://doi.org/10.1143/JPSJ.74.2189
 Times Cited Count：8 Percentile：48.31(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Field-induced ferromagnetic correlation in the metamagnetic crossover in CeRu$$_2$$Si$$_2$$ as studied by neutron scattering

Sato, Masugu*; Koike, Yoshihiro*; Katano, Susumu; Metoki, Naoto; Kadowaki, Hiroaki*; Kawarazaki, Shuzo*

Journal of the Physical Society of Japan, 73(12), p.3418 - 3421, 2004/12

https://doi.org/10.1143/JPSJ.73.3418
 Times Cited Count：20 Percentile：68.56(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Static correlation and dynamical properties of Tb$$^{3+}$$-moments in Tb$$_{2}$$Ti$$_{2}$$O$$_{7}$$; Neutron scattering study

Yasui, Yukio*; Kanada, Masaki*; Ito, Masafumi*; Harashina, Hiroshi*; Sato, Masatoshi*; Okumura, H.*; Kakurai, Kazuhisa; Kadowaki, Hiroaki*

Journal of the Physical Society of Japan, 71(2), p.599 - 606, 2002/02

https://doi.org/10.1143/JPSJ.71.599
 Times Cited Count：80 Percentile：90(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Field-induced ferromagnetic correlation in the heavy-fermion compound CeRu$$_{2}$$Si$$_{2}$$

Sato, Masugu*; Koike, Yoshihiro; Katano, Susumu; Metoki, Naoto; Kadowaki, Hiroaki*; Kawarazaki, Shuzo*

Journal of the Physical Society of Japan, Vol.70, Supplement A, p.118 - 120, 2001/00

no abstracts in English

Journal Articles

Vortex lattice structures in CeRu$$_{2}$$

Suzuki, Junichi; Metoki, Naoto; Haga, Yoshinori; Yamamoto, Etsuji; *; Kakurai, Kazuhisa*; *; Onuki, Yoshichika*

Physica B; Condensed Matter, 241-243, p.871 - 873, 1998/00

https://doi.org/10.1016/S0921-4526(97)00741-2
 Times Cited Count：7 Percentile：46.46(Physics, Condensed Matter)

no abstracts in English

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