Magnetic studies of ceramic and single crystal ${\mathrm{CaRuO}}_{3}$ samples demonstrate that irreversibility appears in the zero-field-cooled field-cooled curves only when measured at low applied magnetic fields. A small hysteresis loop opens temperatures, remanent magnetization decreases with temperature disappears \ensuremath{\sim}90 71 K for samples, respectively. The easy axis is [001]. M\"ossbauer 1% ${}^{57}\mathrm{Fe}$ doped show a sextet 4.1 which 90 K. It proposed not...

NMR, EPR and magnetization measurements in Na$_x$CoO$_2$ for $0.65\leq x\leq 0.75$ are presented. While the signal arises from Co$^{4+}$ magnetic moments ordering at $T_c\simeq 26$ K, $^{59}$Co NMR originates cobalt nuclei metallic regions with no long range order characterized by a generalized susceptibility typical of strongly correlated systems. This phase separation insulating is argued to occur below $T^*(x)$ ($220 - 270$ K). Above $T^*$ an anomalous decrease intensity observed...

We peruse various anomalous physical responses of the cubic (ferromagnetic ${\mathrm{SrRuO}}_{3}$ and paramagnetic ${\mathrm{CaRuO}}_{3}$) ruthenates, such as fractional power-law conductivity, Raman line shapes, Hall currents. show how these exciting observations are naturally described within a new, local (orbital) non-Fermi-liquid state arising from strong, multiorbital Coulomb interactions. Introducing multiorbital, correlated model treated dynamical mean-field theory, we also find two...

${\mathrm{CaRuO}}_{3}$ is a perovskite with an orthorhombic distortion and shows the characteristics of spin-glass behavior below ${T}_{C}=87\mathrm{K}.$ Magnetic studies polycrystalline ${\mathrm{CaRu}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ $(0<x<0.1)$ reveal that ferromagnetic transition at ${T}_{C}=34\mathrm{K}$ appears regardless nonmagnetic Ti concentration. On other hand, magnetic M\"ossbauer effect show ${T}_{C}$...

Why superconductivity appears in only one member (M=${\mathrm{NH}}_{4}$) of the isostructural family organic conductors \ensuremath{\alpha}-(BEDT-TTF${)}_{2}$MHg(SCN${)}_{4}$ is a long-standing question. Others (M =K,Rb,Tl) have density-wave ground states. To address this problem, we studied pressure effects superconducting \ensuremath{\alpha}-(BEDT-TTF${)}_{2}$${\mathrm{NH}}_{4}$Hg(SCN${)}_{4}$ (${\mathit{T}}_{\mathit{c}}$=1.0 K). Our results show remarkable dependence Fermi surface...

${\mathrm{CaRuO}}_{3}$ is a perovskite with an orthorhombic distortion, and believed to be close magnetic ordering. Magnetic studies of single-crystal polycrystalline ${\mathrm{CaRu}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{O}}_{3}$ $(0<~x<~15\mathrm{at}.%\mathrm{Cu})$ reveal that spin-glass-like transition develops for $x<~7\mathrm{at}.%$ Cu. The obtained value the effective moment ${p}_{\mathrm{eff}}=3.55{\ensuremath{\mu}}_{B}$ $x=5\mathrm{at}.%$ Cu single crystal, indicates presence...

Thermodynamic and transport properties of the CaRu1–xTixO3 system with x = 0, 0.03, 0.07, 0.10, 0.15 in magnetic field up to 9 T have been studied. The unconventional temperature dependences susceptibility, specific heat, electrical resistivity observed for CaRuO3 are typical non-Fermi liquids they support assumption about proximity quantum critical point. analysis experimental results suggests electronic phase separation into ferromagnetic itinerant regions coexisting strongly correlated...

Calcium ruthenate ($\mathrm{CaRu}{\mathrm{O}}_{3}$) is widely believed to be located close a quantum critical point due the strong non-Fermi-liquid behavior expressed in temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, corresponding anomalous behavior, marking crossover regimes magnetic response $\mathrm{CaRu}{\mathrm{O}}_{3}$, still lacking. Here we report detailed AC and DC susceptibility measurements $\mathrm{CaRu}{\mathrm{O}}_{3}$...

Specific heat of the layered NaxCoO2 (x=0.65, 0.70 and 0.75) oxides has been measured in temperature range 3-360 K magnetic field 0 9 T. The analysis data, assuming combined effect inter-layer superexchange phase separation into mesoscopic domains with localized spins embedded a matrix itinerant electronic character, suggests that dominant contribution to specific region short-range ordering is mediated by quasi-2D antiferromagnetic clusters, perpendicular CoO2 layers.

The specific heat in the temperature region from 100mKto360K and magnetic fields of 0 9T susceptibility 2to360K a field 1T are measured layered NaxCoO2 (x=0.65, 0.70, 0.75) oxides. Analysis data revealed non-Fermi-liquid behavior. character observed anomalies seems to be connected mesoscopic phase separation, underlining impact disorder on low-lying excitations cobaltates.

We propose a model for charge transfer mechanism in Y 0.8 (Ca) 0.2 Ba 2 Cu 3 O 6+x to count hole doping of CuO planes and x dependence critical transition temperature T c .It is assumed the total number doped holes sum that are introduced through two separate channels: substitution 3+ by Ca 2+ from chains longer than minimal (critical) length l min needed take place.The (x) obtained combining calculated doping, p(x), universal versus p relation.Although dependences =3 =4 both remarkably...

We present a comparative study of Na 0.7 CoO 2 samples obtained from three different sources and prepared by methods.The specific heat magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on observed anomalies, which underlines that system is extremely sensitive to preparation protocols.

The influence of Ti substitution on the specific heat CaTi x Ru 1-x O 3 system at low concentrations = 0, 0.005, and 0.03 was studied in temperature range 2-300 K magnetic fields up to 9 T. Small peak revealed C/T vs. T 2 dependence around K, which are field sensitive (the electronic coefficient γ linearly decreases with increase field), might be connected some kind ordering.The is suppressed also by substitution.

Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline CaTi x Ru 1-x O 3 (x = 0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in temperature range 2-300 K magnetic field up to 9 T. Substantial differences found between two samples: (i) opposite metallic character of CaRuO , substituted sample has insulating-like electrical resistance; (ii) changes sign from negative positive values with increasing temperature.The is...

We have experimentally found related anomalies in electrical resistivity, dc and ac magnetic susceptibility, appearing deeply within ferromagnetically ordered state SrRuO3. Lack of Jahn-Teller distortion this regime rules out conventional orbital order, forcing one to describe these terms an liquid ground coexisting with ferromagnetic spin order. suggest that weak spin-orbit coupling such unusual underpins the observed anomalies.

Quantum paraelectrics are materials in which a long-range ferroelectric/antiferroelectric order is suppressed by quantum fluctuations, i.e. zero-point motion of the lattice prevents condensation soft polar phonon mode even at T = 0 K. The most prominent paraelectric SrTiO3, KTaO3, and CaTiO3. Here we focus on peculiar properties pseudo-cubic perovskite CaTi1-xRuxO3 system. Namely, as soon any concentration either Ru or Ti introduced into pure compounds, concentration-independent...