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201.
Structural aspects of metamagnetism in Ca2-xSrxRuO4: evidence for field tuning of orbital occupation
Kriener M Steffens P Baier J Schumann O Zabel T Lorenz T Friedt O Müller R Gukasov A Radaelli PG Reutler P Revcolevschi A Nakatsuji S Maeno Y Braden M 《Physical review letters》2005,95(26):267403
The crystal structure of Ca(2-x)Sr(x)RuO(4) with 0.2 < or = x < or = 1.0 has been studied by diffraction techniques and by high resolution capacitance dilatometry as a function of temperature and magnetic field. Upon cooling in zero magnetic field, the crystal structure and the octahedra shrink along the c direction and elongate in the a and b planes, whereas the opposite occurs upon cooling at high field (x = 0.2 and 0.5). These findings yield evidence for an orbital rearrangement driven by temperature and magnetic field, which accompanies the metamagnetic transition at low temperature. The temperature and magnetic-field dependencies are found to be governed by the same energy scale. 相似文献
202.
Balicas L Nakatsuji S Hall D Ohnishi T Fisk Z Maeno Y Singh DJ 《Physical review letters》2005,95(19):196407
We report an electrical transport study in Ca2-xSrxRuO4 single crystals at high magnetic fields (B). For x=0.2, the Hall constant Rxy decreases sharply at an anisotropic metamagnetic transition, reaching its value for Sr2RuO4 at high fields. A sharp decrease in the coefficient of the resistivity T2 term and a change in the structure of the angular magnetoresistance oscillations for B rotating in the planes confirms the reconstruction of the Fermi surface. Our observations and local-density-approximation calculations indicate a strong dependence of the Fermi surface on Ca concentration and suggest the coexistence of itinerant and localized electronic states in single layered ruthenates. 相似文献
203.
Nakatsuji S Yeo S Balicas L Fisk Z Schlottmann P Pagliuso PG Moreno NO Sarrao JL Thompson JD 《Physical review letters》2002,89(10):106402
The La dilution of the Kondo lattice CeCoIn5 is studied. The scaling laws found for the magnetic susceptibility and the specific heat reveal two well-separated energy scales, corresponding to the single-impurity Kondo temperature T(K) and an intersite spin-liquid temperature T(*). The Ce-dilute alloy has the expected Fermi liquid ground state, while the specific heat and resistivity in the dense Kondo regime exhibit non-Fermi-liquid behavior, which scales with T(*). These observations indicate that the screening of the magnetic moments in the lattice involves antiferromagnetic intersite correlations with a larger energy scale in comparison with the Kondo impurity case. 相似文献
204.
Shuzo Akiyama Shinichi Nakatsuji Shohei Eda Motohiro Kataoka Masazumi Nakagawa 《Tetrahedron letters》1979,20(30):2813-2816
Isorenieratene has been efficiently synthesized using 4-(t-butylthio)-3-buten-2-one as chain lengthening agent. 相似文献
205.
K Nakashima C Umekawa S Nakatsuji S Akiyama R S Givens 《Biomedical chromatography : BMC》1989,3(1):39-42
The peroxyoxalate chemiluminescence detection of biological thiols combined with high-performance liquid chromatography (HPLC) is described. SH groups of the thiol compounds including glutathione (GSH), cysteine, N-acetylcysteine, cysteamine, and D-penicillamine were labelled with N-[4-(6-dimethylamino-2-benzofuranyl)phenyl]maleimide (DBPM), a specific fluorogenic reagent for SH group. The labelling reaction was carried out at 60 degrees C for 30 min and at pH 8.5 and a sample of the resulting reaction mixture was subjected to HPLC. Five kinds of labelled thiols were separated within 12 min on ODS-80 column (150 x 4.6 mm ID; 5 microns) and detected in the ranges from 500 fmol to 2 pmol/100 microL (cysteamine and N-acetylcysteine), to 3 pmol/100 microL (cysteine) and to 5 pmol/100 microL (GSH and D-penicillamine). The lower detection limits were from 7 fmol (cysteamine) to 113 fmol (GSH) per 100 microL (S/N = 2). The method was applied to the determination of thiols in a rat liver. The amounts of glutathione and cysteine were 1.23 +/- 0.15 mumol/g (n = 5) and 0.15 +/- 0.04 mumol/g (n = 5), respectively. 相似文献
206.
Nakatsuji S Hall D Balicas L Fisk Z Sugahara K Yoshioka M Maeno Y 《Physical review letters》2003,90(13):137202
Low temperature magnetic, thermal, and transport measurements in Ca2-xSrxRuO4 clarify the appearance of a cluster glass phase, after the evolution of a nearly ferromagnetic heavy-mass Fermi liquid from the spin-triplet superconductor Sr2RuO4. As the Mott transition is approached across a 2nd-order structural transition, both the magnetization and specific heat decrease considerably while the transport scattering rate diverges. A metamagnetic transition to a highly spin polarized state, with a local moment S=1/2, is observed. We argue that an orbital rearrangement with Ca substitution changes itinerant ferromagnetism to antiferromagnetism of localized moments. 相似文献
207.
Nakatsuji S Machida Y Maeno Y Tayama T Sakakibara T Duijn Jv Balicas L Millican JN Macaluso RT Chan JY 《Physical review letters》2006,96(8):087204
Strongly frustrated magnetism of the metallic pyrochlore oxide Pr2Ir2O7 has been revealed by single crystal study. While Pr 4f moments have an antiferromagnetic RKKY interaction energy scale of /T*/ = 20 K mediated by Ir 5d-conduction electrons, no magnetic long-range order is found except for partial spin freezing at 120 mK. Instead, the Kondo effect, including a lnT dependence in the resistivity, emerges and leads to a partial screening of the moments below /T*/. Our results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K. 相似文献
208.
209.
Transient absorption spectra in the visible region have been measured for benzonitrile, o-, m- and p-dicyanobenzene, and 1,2,4,5-tetracyanobenzene in ether-isopentane-ethanol glass at 77 K by means of a flash spectroscopy technique with a sample cell of long path length. Weak transient absorptions decaying at the same rates as the corresponding phosphorescences have been detected in the visible region (400–600 nm), and are attributed to TT transitions which may be associated with local excitations within the benzene ring. 相似文献
210.
Metaloxidesareonekindofmaterialofimportantapplications[1,2].Fortheclustermodelingofmetaloxideswithquantumchemicalmethods,thewaysgointothreegroups[3,4],i.e.thebareclustermodel,thesaturatedclustermodelandtheembeddedclustermodel.Thebareclustermodelissimplyasmal… 相似文献