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Trigonal Silver Nanostructure for Single Molecule Detection with Surface Enhanced Raman Scattering
Y. Yamaguchi,M. Futamata,M. Ishikawa,Y. Maruyama 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Silver nanostructure was fabricated by means of nanosphere lithography developed by Van Duyne et al. The nanostructure is composed of a two-dimensional (2-D) array of trigonal prisms that could form an enormous electric field at their sharp edges under localized surface plasmon resonances to provide single molecule sensitivity. In fact, it yielded the blinking of a SERS signal from adsorbed rhodamine 6G, which is an abrupt and repeated intensity fluctuation with time and has been attributed to a single molecule phenomenon. The blinking occurred on the trigonal metal nanostructure approximately 20 times as efficiently as on continuous silver films prepared with the same evaporation condition as for the trigonal structure. Accordingly, the trigonal silver nanostructure is quite promising to give single molecule sensitivity in SERS.
Kim, D Y,Ryu, D H,Hong, J B,Park, J-G,Kwon, Y S,Jung, M A,Jung, M H,Takeda, N,Ishikawa, M,Kimura, S IOP Pub 2004 Journal of Physics, Condensed Matter Vol.16 No.46
<P>We report on the magnetic susceptibility, specific heat and electrical resistivity of the heavy fermion compounds CeNiGe<SUB>2−<I>x</I></SUB>Si<SUB><I>x</I></SUB> (<img ALIGN='MIDDLE' SRC='http://ej.iop.org/images/0953-8984/16/46/018/cm185233ieqn1.gif' ALT='0\leq x \leq 1 '/>). Compounds with <I>x</I><1 show antiferromagnetic order, which with increasing <I>x</I> shifts toward lower temperature owing to increased exchange coupling between the localized 4f magnetic moments and conduction electrons. Eventually, the magnetic order almost becomes absent, for <I>x</I> = 1. An anomaly observed in the specific heat is well interpreted by the Kondo model for a degenerate impurity spin <I>J</I> = 1/2 in the Coqblin–Schrieffer limit. A coherence peak indicative of the formation of a Kondo lattice is found in the electrical resistivity, whose features are consistent with the results for the specific heat. Interestingly, there is a significant deviation from Fermi-liquid behaviour at the critical concentration <I>x</I> = 1. This deviation is attributed to a quantum phase transition in a model with two-dimensional antiferromagnetic fluctuations.</P>
Lattice Modulation in YMn2O5 and TbMn2O5 Studied by Using Synchrotron Radiation X-rays
Yukio Noda,H Kimura,H Sawa,K Kohn,N Ikeda,S Kobayashi,Y Ishikawa,Y Kamada,Y Wakabayashi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
RMn2O5 (R = Y and rare earth) shows successive magnetic and ferroelectric phase transitions at about 45 K, 40 K, 39 K, 20 K and 10 K and is called a multiferroic compound. We have investigated the lattice modulation vectors (qL) of YMn2O5 and TbMn2O5 by using single crystal Synchrotron Radiation X-ray diraction and compared them with the magnetic propagation vectors (qM) studied by neutron diraction. The relation of the propagation vectors between magnetic materials and dielectrics is found to be qL = 2qM. A preliminary structure analysis of the atomic displacement pattern in the commensurate ferroelectric phase of TbMn2O5 is discussed.fb