J. P. He

Electrically driven spin excitation in a ferroelectric magnet DyMnO_3 (2007)

Kida, N., Ikebe, Y., Takahashi, Y., He, J. P., Kaneko, Y., Yamasaki, Y., ...

Temperature (5--250 K) and magnetic field (0--70 kOe) variations of the low-energy (1--10 meV) electrodynamics of spin excitations have been investigated for a complete set of light-polarization...

Local Tunneling Spectroscopy across a Metamagnetic Critical Point in the Bi-layer Ruthenate Sr3Ru2O7 (2007)

Iwaya, K., Satow, S., Hanaguri, T., Shannon, N., Yoshida, Y., Ikeda, S. I., ...

The local spectroscopic signatures of metamagnetic criticality in Sr3Ru2O7 were explored using scanning tunneling microscopy (STM). Singular features in the tunneling spectrum were found close to the...

Logarithmic growth law in the two-dimensional Ising spin glass state resulting from the electron doping in single-layered manganites (2007)

Mathieu, R., He, J. P., Kaneko, Y., Yoshino, H., Asamitsu, A., Tokura, Y.

The ac-susceptibility of the electron doped single-layered manganite La$_{1.1}$Sr$_{0.9}$MnO$_4$ is analyzed in detail. A quasi two-dimensional (2$D$) antiferromagnetic (AFM) order with Ising...

Variation of charge/orbital ordering in layered manganites Pr1-xCa1+xMnO4 investigated by transmission electron microscopy (2007)

Yu, X. Z., Mathieu, R., Arima, T., Kaneko, Y., He, J. P., Uchida, M., ...

Structural features of the charge/orbital ordering (CO/OO) in single-layered manganites Pr1-xCa1+xMnO4 have been investigated systematically by transmission electron microscopy. Analyses of electron...

Coexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder (2007)

Mathieu, R., He, J. P., Yu, X. Z., Kaneko, Y., Uchida, M., Lee, Y. S., ...

The relationship between orbital and spin degrees of freedom in the single-crystals of the hole-doped Pr$_{1-x}$Ca$_{1+x}$MnO$_4$, 0.3 $\leq$ $x$ $\leq$ 0.7, has been investigated by means of...

Bandwidth-disorder phase diagram of half doped layered manganites (2006)

Mathieu, R., Uchida, M., Kaneko, Y., He, J. P., Yu, X. Z., Kumai, R., ...

Phase diagrams in the plane of $r_A$ (the average ionic radius, related to one-electron bandwidth $W$) and $\sigma^2$ (the ionic radius variance, measuring the quenched disorder), or...

In-plane anisotropy of the electronic structure for the charge/orbital-ordered state in half-doped manganite with layered structure (2006)

Lee, Y. S., Onoda, S., Arima, T., Tokunaga, Y., He, J. P., Kaneko, Y., ...

We report on the in-plane anisotropy of the electronic response in the spin/charge/orbital ordered phase of a half-doped layered-structure manganite. The optical conductivity spectra for a single...

Impurity-induced transition to a Mott insulator in Sr$_3$Ru$_2$O$_7$ (2005)

Mathieu, R., Asamitsu, A., Kaneko, Y., He, J. P., Yu, X. Z., Kumai, R., ...

The electrical, magnetic, and structural properties of Sr$_3$(Ru$_{1-x}$Mn$_x$)$_2$O$_7$ (0 $\leq x \leq$ 0.2) are investigated. The parent compound Sr$_3$Ru$_2$O$_7$ is a paramagnetic metal,...

Eu$_{0.5}$Sr$_{1.5}$MnO$_4$: a three-dimensional XY spin glass (2005)

Mathieu, R., Asamitsu, A., Kaneko, Y., He, J. P., Tokura, Y.

The frequency, temperature, and dc-bias dependence of the ac-susceptibility of a high quality single crystal of the Eu$_{0.5}$Sr$_{1.5}$MnO$_4$ layered manganite is investigated....