23 Result(s)

Article

X-ray Diffraction Study of MgB₂ at Low Temperatures

We have performed powder X-ray diffraction of MgB₂ superconductor between 10 and 300 K. Temperature dependence of integrated intensities of both (002) and (110) X-ray reflections shows a peak at around T_C, superc...

Y. Xue, S. Asada, A. Hosomichi, S. Naher, J. Xue… in Journal of Low Temperature Physics (2005)

Chapter and Conference Paper

Nuclear Spin-Lattice Relaxation of Single Crystal Sr₁₄Cu₂₄O₄₁

Nuclear spin-lattice relaxation rate T ₁ ⁻¹ has been measured for the ladder sites of two single crystals Sr₁₄Cu₂₄O₄₁ (Sr14-A,B) by ⁶³Cu NMR/NQ...

S. Ohsugi, S. Matsumoto, Y. Kitaoka, M. Matsuda, M. Uehara, T. Nagata… in HFI/NQI 2004 (2005)

Chapter

Superconductivity in MgB₂

T. Muranaka, Y. Zenitani, J. Shimoyama… in Frontiers in Superconducting Materials (2005)

Chapter

Superconductivity and Magnetism in Ladder and Chain Compounds

M. Uehara, N. Motoyama, M. Matsuda, H. Eisaki… in Frontiers in Magnetic Materials (2005)

Article

Nuclear Spin–Lattice Relaxation of Single Crystal Sr₁₄Cu₂₄O₄₁

Nuclear spin–lattice relaxation rate T ₁ ⁻¹ has been measured for the ladder sites of two single crystals Sr₁₄Cu₂₄O₄₁ (Sr14-A,B) by ⁶³Cu NMR/NQR. The hole localizat...

S. Ohsugi, S. Matsumoto, Y. Kitaoka, M. Matsuda, M. Uehara… in Hyperfine Interactions (2004)

Article

Evidence of Electron–Phonon Interaction in Al-Substituted Mg_1−x Al _x B₂

Phonon density of states in Al substituted Mg_1−x Al _x B₂ has been studied by means of inelastic neutron scattering experiments with pulsed neutron time-of-flight technique. Phono...

T. Yokoo, T. Muranaka, M. Arai, K. Papagelis, K. Prassides… in Journal of Superconductivity (2004)

Article

Cu-NQR Study on Single Crystals Sr_14−x Ca _x Cu₂₄O₄₁ with x = 0–11.5

Cu-nuclear quadrupole resonance (NQR) measurements have been performed on single crystals Sr_14−x Ca _x Cu₂₄O₄₁ (Ca _x ) with x = 0–11.5, in order ...

S. Ohsugi, Y. Kitaoka, T. Nagata, H. Fu**o… in Journal of Low Temperature Physics (2003)

Article

Optical measurements of the superconducting gap in MgB ₂

Far-infrared reflectivity studies on the polycrystalline intermetallic compound MgB₂ with a superconducting transition temperature T _c = 39 K were performed at temperatures 20...

B. Gorshunov, C.A. Kuntscher, P. Haas… in The European Physical Journal B - Condense… (2001)

Chapter

Coexistence of Antiferromagnetic order and Superconductivity in the Spin Ladder System Sr_2.5Ca_11.5Cu₂₄O₄₁

The crucial question of whether the superconducting phase found in the spin ladder compound Sr_14-xCa_xCu₂₄O₄₁ is due to the natural pair forming mechanism predicted for isolated ladders is still open. A recent exp...

D. Braithwaite, J. Thomasson, B. Salce… in Frontiers of High Pressure Research II: Ap… (2001)

Chapter

Angle-Resolved Photoemission Study of 1D Chain and Two-Leg Ladder

We performed angle-resolved photoemission spectroscopy (ARPES) on Sr₂CuO₃ and Sr₂CuO₃ to study the difference of electronic structure between the corner-sharing one-dimensional (1D) chain and the two-leg ladder c...

T. Sato, T. Yokoya, H. Fujisawa, T. Takahashi, M. Uehara… in Stripes and Related Phenomena (2000)

Article

Antiferromagnetic Transition in Sr_14−x Ca _x Cu₂₄O₄₁ Investigated by Specific Heat Measurements

Results for low temperature specific heat for single crystals of ladder/chain materials Sr _14−x Ca _x Cu ₂₄ O ₄₁ (x= 0, 8, 10, 11.5) in magnetic field up to ∼15 T are reported...

M. Hiroi, M. Sera, N. Kobayashi, T. Nagata, H. Fu**o… in Journal of Low Temperature Physics (1999)

Chapter and Conference Paper

Spin and Charge Dynamics in the Hole-Doped Two-Leg Ladder Compound Sr_14−x Ca _x Cu₂₄O₄₁

Our experimental results obtained with the doped ladder material Sr_2.5Ca_11.5Cu₂₄O₄₁ have been reviewed. Our main conclusions are 1) anisotropic resistivity under high-pressure has been measured on the single crys...

J. Akimitsu, T. Nagata, H. Fu**o… in Physics and Chemistry of Transition Metal … (1999)

Chapter and Conference Paper

NMR Probe of Magnetic Order and Spin Correlation in Hole-Doped Ladder Cuprates

Comprehensive Cu-NQR and -NMR studies of Sr_14−x Ca _x Cu₂₄O₄₁ (denoted as CaX) including CuO₂ chains and Cu₂O₃ ladders have revealed the onset of long-range magnet...

Y. Kitaoka, T. Mito, S. Ohsugi, K. Magishi… in Physics and Chemistry of Transition Metal … (1999)

Article

Appearance of magnetic long range order in the spin ladder compound LaCuO_2.5

We report here the two current topics in the ladder compounds.

J. Akimitsu, H. Okajima, A. Yamashita, K. Ishii, T. Yokoo… in Hyperfine Interactions (1997)

Article

The magnetic field dependence of the low temperature (0.1K to 3K) residual specific heat of Pr_2−x Ce _x CuO_4−δ

Measurements are presented of the low temperature specific heat of three polycrystalline samples of Pr_2−x Ce _x CuO₄ in magnetic fields of 0, 2 and 4 Tesla. The re...

T. E. Hargreaves, J. Akimitsu, D. F. Brewer… in Czechoslovak Journal of Physics (1996)

Article

A new family of superconductors containing carbonate group

Three new oxycarbonate superconductors recently obtained in our laboratory are described. (1) Sr₂CuO₂(CO₃)_1−x (BO₃) _x (T _c = 35 K) was synthe...

J. Akimitsu, H. Nakata, M. Uehara in Journal of Superconductivity (1994)

Chapter and Conference Paper

Infrared Absorption and Raman Study of R₂CuO₄

Phonon spectra of R₂CuO₄ (R=Pr, Nd, Sm, and Gd) have been measured by infrared absorption and Raman scattering. The symmetry forbidden mode of B_2g has been observed for Gd. This fact suggests that the oxygen in t...

M. Udagawa, Y. Nagaoka, N. Ogita, M. Masada… in Advances in Superconductivity VI (1994)