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RISS 인기검색어
- 검색키워드
- 저자 : Hilscher, G (검색결과 2 건)
- 무료
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- 유료
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The magnetic instability of Yb<sub>2</sub>Pd<sub>2</sub>(In,Sn) in a non-Fermi liquid environment
Bauer, E,Hilscher, G,Michor, H,Paul, Ch,Aoki, Y,Sato, H,Adroja, D T,Park, J-G,Bonville, P,Godart, C,Sereni, J,Giovannini, M,Saccone, A IOP Pub 2005 Journal of physics, an Institute of Physics journa Vol.17 No.11
<P>Various concentrations of the solid solution Yb<SUB>2</SUB>Pd<SUB>2</SUB>In<SUB>1−<I>x</I></SUB>Sn<SUB><I>x</I></SUB> ranging from <I>x</I> = 0 to 1 with the tetragonal Mo<SUB>2</SUB>FeB<SUB>2</SUB>-type structure were prepared and their physical properties were studied by means of bulk and spectroscopic measurements as a function of temperature, pressure and magnetic fields. Results deduced from these studies indicate a slight variation of the valency of the Yb ions, from <img SRC='http://ej.iop.org/images/0953-8984/17/11/032/cm192308ieqn1.gif' ALIGN='MIDDLE' ALT='\nu \approx 2.9 '/> for both border compounds to &ngr; = 3 at <I>x</I> = 0.6. This variation gives rise to the appearance of long range magnetic order in a narrow concentration region around <I>x</I> = 0.6, while both border compounds remain non-magnetic. The outstanding concentration dependence for the ordered regime may be indicative of two quantum critical points, a novel feature not yet observed in Yb compounds. </P>
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Irreversible field-induced magnetic phase transitions and properties of Ho<sub>3</sub>Co
Baranov, N V,Goto, T,Hilscher, G,Markin, P E,Michor, H,Mushnikov, N V,Park, J-G,Yermakov, A A IOP Pub 2005 Journal of physics, an Institute of Physics journa Vol.17 No.21
<P>The results of magnetic susceptibility, magnetization, electrical resistivity and specific heat measurements performed on Ho<SUB>3</SUB>Co single crystals show that this compound exhibits two different antiferromagnetic structures: AF<SUB>II</SUB> at 8 K<<I>T</I>< 22 K and AF<SUB>I</SUB> below <I>T</I><SUB>t</SUB>≈8 K. Below the Néel temperature <I>T</I><SUB>N</SUB> = 22 K the application of a magnetic field along the main crystallographic directions induces magnetic phase transitions which are accompanied by giant magnetoresistance. At <I>T</I><<I>T</I><SUB>t</SUB> the field-induced phase transitions along the <B><I>c</I></B>- and <B><I>b</I></B>-axes are found to be irreversible, and a small ferromagnetic component is observed along the <B><I>a</I></B>-axis. These peculiarities are associated with the non-Kramers character of the Ho ion and with the presence of a complex incommensurate magnetic structure of Ho<SUB>3</SUB>Co below <I>T</I><SUB>N</SUB>. The temperature coefficient of the electrical resistivity for Ho<SUB>3</SUB>Co above <I>T</I><SUB>N</SUB> over a wide temperature range is found to differ from that observed for other R<SUB>3</SUB>Co compounds. Such a behaviour is attributed to the presence of an additional contribution to the conduction electron scattering by spin fluctuations induced by f–d exchange in the itinerant d-electron subsystem. The value of this extra contribution and its temperature range is suggested to depend on the spin value of the R ion. The excess of the effective magnetic moment per R ion, which is observed in Ho<SUB>3</SUB>Co and in other R<SUB>3</SUB>M type compounds, is also attributed to spin fluctuations induced by f–d exchange.</P>
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