C. P. Sun

Magnetic field dependence of low-temperature specific heat of the spinel oxide superconductor LiTi2O4

Magnetic field dependence of low temperature specific heat of spinel oxide superconductor LiTi_2O_4 has been elaborately investigated. In the normal state, the obtained electronic coefficient of specific heat gamma_n = 19.15 mJ/mol K2, the Debye temperature is 657 K and some other parameters are compared with those reported earlier. The superconducting transition at Tc ~ 11.4 K is very sharp (DeltaTc ~ 0.3 K) and the estimated delataC/gamma_nTc is ~ 1.78. In the superconducting state, the best fit of data leads to the electronic specific heat C_es/Gamma_nTc = 9.87 exp (-1.58 Tc/T) without field and gamma(H) ~ H^0.95 with fields. In addition, Hc2(0) ~ 11.7 T, Hc(0) ~ 0.32 T, xi_GL(0) ~ 5.5 nm, lambda_GL(0) ~ 160 nm, and Hc1(0) ~ 26 mT are estimated from Werthamer-Helfand-Hohenberg (WHH) theory or other relevant relations. All results from the present study indicate that LiTi2O4 can be well described by a typical type-II, BCS-like, moderate coupling, and fully gapped superconductor in the dirty limit. It is further suggested that LiTi2O4 is a moderately electron-electron correlated system.

Magnetocaloric effect in charge ordered Nd0.5Ca0.5MnO3 manganite

The magnetocaloric effect (MCE) has been observed in three well-defined temperature intervals (region I: 2–115 K, region II: around charge order transition TCO, and region III: around room temperature) in polycrystalline Nd0.5Ca0.5MnO3 (NCMO) manganite system showing a first order (CO) transition at a temperature, TCO∼250 K. The magnitude of ΔSM(H) increases monotonically with applied magnetic field but does not reach saturation even at fields as high as 60 kOe. In the three given temperature regions, negligible magnetic and thermal hysteresis are found, which satisfies the requirements of using NCMO as an effective magnetocaloric material for magnetic refrigeration.

Comparative analysis of specific heat of YNi2B2C using nodal and two-gap models

The magnetic field dependence of low temperature specific heat in

Colossal electroresistance and colossal magnetoresistance in spinel multiferroic CdCr2S4

{\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}

Evidence of nodal superconductivity in Na 0.35 CoO 2 · 1.3 H 2 O : A specific-heat study

was measured and analyzed using various pairing order parameters. At a zero magnetic field, the two-gap model, which has been successfully applied to

Experimental evidence for a two-gap structure of superconducting NbSe2 : A specific-heat study in external magnetic fields

{\mathrm{MgB}}_{2}

Anomalous pressure effect on the magnetic ordering in multiferroic BiMnO 3

and the point-node model, appear to describe the superconducting gap function of

Ferro-antiferromagnetic coupling and unusual transport properties of ferro-antiferromagnetic (100−x) La0.7Pb0.3MnO3+xPr0.63Ca0.37MnO3 (x=0–85wt%) composites

{\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}

Phase separation and huge enhancement of magnetoresistance in Pr0.65Ca0.35−xSrxMnO3

better than other models based on the isotropic

Magnetism-induced ferroelectric polarization in the c-axis-oriented orthorhombic HoMnO3 thin films

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