Zobrazeno 1 - 10
of 339
pro vyhledávání: '"Jeong, I. -K."'
Autor:
Jeong, I. -K., Hur, N.
To unravel the origin of the dielectric anomaly at the antiferromagnetic ordering of magnetoelectric Bi$_2$Fe$_4$O$_9$ we performed neutron powder diffraction measurements across the N$\acute{\rm e}$el temperature, $T_{\rm N}$. Both local structures
Externí odkaz:
http://arxiv.org/abs/1605.03681
We performed neutron powder diffraction measurements on (Bi$_{0.5}$Na$_{0.5+x}$)TiO$_3$ and (Bi$_{0.5+y}$Na$_{0.5}$)TiO$_3$ to study structural evolution induced by the non-stoichiometry. Despite the non-stoichiometry, the local structure ($r$$\leq$
Externí odkaz:
http://arxiv.org/abs/1509.01341
We present a unique example of giant magnetoelectric effect in a conventional multiferroic HoMnO3, where polarization is very large (~56 mC/m2) and the ferroelectric transition temperature is higher than the magnetic ordering temperature by an order.
Externí odkaz:
http://arxiv.org/abs/0805.3289
Autor:
Jeong, I. -K., Darling, T. W., Lee, J. K., Proffen, Th., Heffner, R. H., Park, J. S., Hong, K. S., Dmowski, W., Egami, T.
Using neutron pair distribution function (PDF) analysis over the temperature range from 1000 K to 15 K, we demonstrate the existence of local polarization and the formation of medium-range, polar nanoregions (PNRs) with local rhombohedral order in a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0412173
Autor:
Cao, D., Heffner, R. H., Bridges, F., Jeong, I. -K., Bauer, E. D., Yuhasz, W. M., Maple, M. B.
Extended X-ray Absorption Fine Structure (EXAFS) experiments have been carried out on PrRu$_4$P$_{12}$ and PrOs$_4$P$_{12}$ to study the metal-to-insulator (MI) phase transition in PrRu$_4$P$_{12}$. No Pr displacement was observed across the MI trans
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408701
Autor:
Jeong, I. -K., Darling, T. W., Graf, M. J., Proffen, Th., Heffner, R. H., Lee, Yongjae, Vogt, T., Jorgensen, J. D.
The temperature and pressure dependence of the thermal displacements and lattice parameters were obtained across the $\gamma \to \alpha$ phase transition of Ce using high-pressure, high-resolution neutron and synchrotron x-ray powder diffraction. The
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308416
The mean-square relative displacements (MSRD) of atomic pair motions in crystals are studied as a function of pair distance and temperature using the atomic pair distribution function (PDF). The effects of the lattice vibrations on the PDF peak width
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209603
Autor:
Peterson, P. F., Proffen, Th., Jeong, I. -K., Billinge, S. J. L., Choi, K. -S., Kanatzidis, M. G., Radaelli, P. G.
High real-space resolution atomic pair distribution functions (PDFs) have been obtained from ZnSe(1-x)Te(x) using neutron powder diffraction. Distinct Zn-Se and Zn-Te nearest neighbor (nn) bonds, differing in length by delta_r= 0.14Angstroms, are res
Externí odkaz:
http://arxiv.org/abs/cond-mat/0009364
Nearest and higher neighbor distances as well as bond length distributions (static and thermal) of the In_xGa_(1-x)As (0
Externí odkaz:
http://arxiv.org/abs/cond-mat/0008079
High resolution total and indium differential atomic pair distribution functions (PDFs) for In_(0.5)Ga_(0.5)As alloys have been obtained by high energy and anomalous x-ray diffraction experiments, respectively. The first peak in the total PDF is reso
Externí odkaz:
http://arxiv.org/abs/cond-mat/9911293