Pure CoO nanoparticles in the 4.5−18 nm range have been prepared by decomposition of Co(ΙΙ) cupferronate Decalin at 270 °C under solvothermal conditions. The particles characterized X-ray diffraction, transmission electron microscopy, and cognate techniques. are stable because organic coating that occurs situ. is readily removed heating to 260 without loss nanoparticulate nature. Magnetic measurements reveal presence ferromagnetic interactions low temperatures small (<16 nm). do not exhibit...

Reports the results of studies on a new and very interesting intermediate valence (IV) material EuPd2Si2, which exhibits some unique features not observed so far in any Eu-based IV system. The magnetic susceptibility clear maximum isomer shift shows an unusually large temperature dependence interval 120-200K.

X-ray-absorption near-edge structure (XANES) studies were performed at the ${L}_{\mathrm{III}}$ thresholds of Ce${\mathrm{O}}_{2}$ and Ce${\mathrm{F}}_{4}$ as a function external pressure up to \ensuremath{\cong}267 kbar room temperature. In both cases, ${4f}^{0}$-related higher-energy component essentially double-peaked XANES decreases in relative intensity with pressure, opposite what is generally observed for metallic mixed-valent Ce compounds. This supports proposed peak assignment on...

Electrical resistivity ($\rho$), magnetoresistance (MR), magnetization, thermopower and Hall effect measurements on the single crystal Gd$_{2}$PdSi$_3$, crystallizing in an AlB$_2$-derived hexagonal structure are reported. The well-defined minimum $\rho$ at a temperature above N\'eel (T$_N$= 21 K) large negative MR below $\sim$ 3T$_N$, reported earlier for polycrystals, reproducible even crystals. Such features generally uncharacteristic of Gd alloys. In addition, we also found interesting...

An amine-templated iron(II) sulfate of the composition [H3N(CH2)6NH3] [FeII1.5F3(SO4)]·0.5H2O, I, representing an example a Kagome lattice with Fe in +2 state, has been synthesized under solvothermal conditions. Having determined structure by single-crystal X-ray diffraction, oxidation state iron was established Mossbauer spectroscopy. The magnetic properties Fe(II) compound are rather unusual that it undergoes ferrimagnetic ordering below 19 K and does not exhibit spin-glass freezing.

We have performed field-swept 59Co NMR measurements on the 'exotic' spin-chain material, Ca3Co2O6, crystallizing in K4CdCl6-type rhombohedral structure, believed to exhibit two magnetic transition temperatures (around 24 and 12 K). This is first investigation of this family compounds. are able detect signal below about 15 K, which a conclusive proof for existence non-magnetic Co ions (Co3+ - low-spin 3d6, addition ions) at least narrow temperature range around 10 thereby resolving...

A comparison of photoemission from shallow core levels with deep core-level spectroscopies allows a distinction between mixed valency and covalency in rare-earth systems. The determinative parameter distinguishing these is the Coulomb interaction hole 4f shell. This approach confirms that compound ${\mathrm{CeF}}_{4}$ tetravalent, but does not deny covalent admixture character into valence band.

The magnetic behavior of the compound, Gd3Ru4Al12, which was reported about two decades ago to crystallize in a hexagonal structure (space group P63/mmc), has not been investigated past literature despite interesting structural features (that is, layers and triangular as well kagomé-lattice favoring frustrated magnetism) characterizing this compound. We report here results studies magnetization, heat capacity magnetoresistance temperature range T = 1.8-300 K. establish that there is...

Results on electrical resistivity, magnetoresistance, magnetic susceptibility, heat capacity and 155Gd Mössbauer measurements a Gd-based intermetallic compound, Gd2PdSi3, are reported. A finding of interest is that the resistivity unexpectedly shows well-defined minimum at about 45 K, well above long-range magnetic-ordering temperature (21 K), feature which gets suppressed by application field. This observation in Gd alloy presents an interesting scenario. On basis our results, we propose...

We report the results of dc and ac magnetization measurements as a function temperature (1.8 - 300 K) for spin-chain compound, ${\mathrm{Ca}}_{3}{\mathrm{CoRhO}}_{6},$ which has been recently reported to exhibit partially disordered antiferromagnetic (PDAF) structure in range 30--90 K spin-glass freezing below 30 K. observe an unexpectedly large frequency dependence susceptibility T K, typical superparamagnets. In addition, we find that there is no difference isothermal remanent behavior two...

The compound, Nd7Rh3, crystallizing in Th7Fe3-type hexagonal structure, was previously known to exhibit two magnetic transitions, one at 32 K and the other 10 (in zero field). Here, we report existence of a field-induced first-order antiferromagnetic ferromagnetic transition 1.8 this compound. On basis measurements isothermal magnetization magnetoresistance, provide evidence for occurence kinetic-hindrance, proposed literature, resulting phase co-existence (super-cooled + antifferomagnetic)...

We have obtained Co $2p$, Rh $3d$, Ir $4f$, and valence-band x-ray photoemission spectra of ${\mathrm{Ca}}_{3}{\mathrm{Co}}_{2}{\mathrm{O}}_{6}$, ${\mathrm{Ca}}_{3}\mathrm{Co}\mathrm{Rh}{\mathrm{O}}_{6}$, ${\mathrm{Ca}}_{3}\mathrm{Co}\mathrm{Ir}{\mathrm{O}}_{6}$, ${\mathrm{Sr}}_{3}\mathrm{Zn}\mathrm{Ir}{\mathrm{O}}_{6}$ in order to determine the valence states Co. The spectral features are consistent with picture that is trivalent state at both trigonal prismatic octahedral sites high-...

We bring out novel dielectric behavior of a spin-chain compound, Ca3Co2O6, undergoing Néel order at (TN = ) 24 K. It is found that the virgin curve in plot isothermal constant (ε') versus magnetic-field lies outside 'butterfly-shaped' envelope well below TN (e.g., 2.6 K), with signature partial arrest high-field magnetoelectric (ME) phase zero-field after travelling through magnetic-field-induced magnetic transitions. This contrast to observed magnetization data. Thus, this work brings case...

Abstract Observation of ferroelectricity among non-d 0 systems, which was believed for a long time an unrealistic concept, led to various proposals the mechanisms explain same (i.e. magnetically induced ferroelectricity) during last decade. Here, we provide support displacive-type possibly involving magnetic ions due short-range correlations within spin-chain, through demonstration magnetoelectric coupling in Haldane spin-chain compound Er 2 BaNiO 5 well above its Néel temperature ( T N = )...

We report the results of various measurements, namely magnetization, complex dielectric permittivity and electric polarization (P) on Dy2BaNiO5 as a function temperature (T) magnetic-field (H), apart from heat-capacity (C), with primary motivation exploring existence magnetoelectric (ME) coupling among Haldane spin-chain systems. The M(T) C(T) data establish long range magnetic ordering at 58K. most noteworthy observations are: (i) Distinct anomalies are observed in constant ({\epsilon}') vs...

The compound, Fe2TiO5 (FTO)is a well-known uniaxial anisotropic spin-glass insulator with two successive glassy freezing temperatures i.e. transverse (TTF= 9K) and longitudinal (TLF= 55 K). In this article, we present the results of measurements complex dielectric behavior, electric polarization as function temperature (T), in addition to characterization by magnetic susceptibility heat-capacity, primarily explore magnetoelectric (ME) coupling multiglass properties spin cluster-glass FTO....