scispace - formally typeset
Search or ask a question
Author

J.S. Schilling

Bio: J.S. Schilling is an academic researcher from Ludwig Maximilian University of Munich. The author has contributed to research in topics: Magnetic susceptibility & Superconductivity. The author has an hindex of 10, co-authored 21 publications receiving 287 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the static magnetic susceptibility of hole-doped oxide superconductors was studied as a function of oxygen content over the temperature range 2-900 K, and a correlation was observed between the magnitude of T c ( y ) and the temperature dependence of the normal-state magnetic susceptibility.
Abstract: The static magnetic susceptibility of Bi 2 Sr 2 CaCu 2 O 8+ y and Tl 2 Ba 2 CuO 6+ y is studied as a function of oxygen content y over the temperature range 2–900 K. With increasing oxygen (hole) content the superconducting transition temperature T c ( y ) passes through a maximum for the Bi-compound and falls monotonically for the Tl-system, reaching a maximal value of c ≅92 K in both systems. As the oxygen content is varied, a correlation is observed between the magnitude of T c ( y ) and the temperature dependence of the normal-state magnetic susceptibility. The fact that this same correlation can also be seen in the published data on La 2- x Sr x CuO 4 and YBa 2 Cu 2 O 6+ y implies that it may be a universal property of hole-doped oxide superconductors.

82 citations

Journal ArticleDOI
TL;DR: The pressure dependence of the AC susceptibility of a YBa2Cu3O7−δ single crystal has been measured to 13 GPa using a diamond-anvil cell loaded with liquid helium as mentioned in this paper.
Abstract: The pressure dependence of the AC susceptibility of a YBa2Cu3O7−δ single crystal has been measured to 13 GPa using a diamond-anvil cell loaded with liquid helium. The superconducting transition temperature Tc initially increases with hydrostatic pressure at the rate + (0.65±0.15) K/GPa but then passes through a maximum at ∼4 GPa. This result is believed to be quite general and to reflect to dependence of Tc on the planar hole carrier density which increases monotonically under pressure.

34 citations

Journal ArticleDOI
TL;DR: The present data indicates that magnetism in the CeSi-x system may not be simple ferromagnetic and the experimental behavior of this system appears to be Kondo-lattice-like both at ambient and high pressure.
Abstract: We have made detailed investigations of the structural and magnetic properties of ${\mathrm{CeSi}}_{\mathrm{x}}$ (1.0\ensuremath{\le}x\ensuremath{\le}2.0). The homogeneity region of the ${\mathrm{ThSi}}_{2}$-type (${\mathrm{GdSi}}_{2}$-type) ${\mathrm{CeSi}}_{\mathrm{x}}$ phase is limited to the Si concentrations x: 1.67\ensuremath{\le}x\ensuremath{\le}2.0 and does not extend to the concentration range 1.55\ensuremath{\le}x\ensuremath{\le}2.0, as was reported previously. A transformation from the tetragonal ${\mathrm{ThSi}}_{2}$-type structure to the orthorhombic ${\mathrm{GdSi}}_{2}$-type structure appears to occur in the ${\mathrm{CeSi}}_{\mathrm{x}}$ system in the same range (1.84x1.9) where ferromagnetism appears and the specific-heat coefficient \ensuremath{\gamma} passes through a peak. The presence of an unknown stable phase with composition intermediate to ${\mathrm{CeSi}}_{1.0}$ and ${\mathrm{Ce}}_{3}$${\mathrm{Si}}_{5}$ has been detected. Magnetically ordered ground states have been observed for x\ensuremath{\le}1.84 and no magnetic or superconducting ordering above 400 mK has been detected for x\ensuremath{\ge}1.90. The present data indicates that magnetism in the ${\mathrm{CeSi}}_{\mathrm{x}}$ system may not be simple ferromagnetic. The experimental behavior of this system appears to be Kondo-lattice-like both at ambient and high pressure.

24 citations

Journal ArticleDOI
TL;DR: Simultaneous deformity correction in the frontal and sagittal plane becomes more and more an important part of intramedullary lengthening to avoid further operative procedures.
Abstract: Simultaneous deformity correction in the frontal and sagittal plane becomes more and more an important part of intramedullary lengthening to avoid further operative procedures. Such as in fracture treatment blocking screws can be used for alignment control if osteotomy is performed in the metaphyseal bone. 31 intramedullary lengthening procedures between 2009 and 2011 were retrospectively analysed for precision of simultaneous deformity correction. The average planned correction to the HKA was 2.4° (0.1°-8.0°) and the final results after lengthening deviated an average of 1.7° (0.0°-8.1°) from the planning. With blocking screws a higher degree of deformity (mean 3.2° vs. 1.7°; p<0.05) was corrected with a slightly higher precision (mean 1.5° vs. 1.9°; p=0.48) compared to patients without blocking screws. Placed on the concave side of the deformity blocking screws are a helpful tool to successfully address leg length discrepancy and other deformities with one single operation.

20 citations

Journal ArticleDOI
TL;DR: In this article, the electrical resistivity of four Kondo systems, Au-(5 p.p.m. Fe), Au-(39 p.m.,p.p.,m. Mn) and Au-(50 p.,p,m.n), was measured in the temperature range 1.3-20 K at pressures up to 80 kbar.

19 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A review of sol-gel preparation of high temperature superconducting oxides is presented in this paper, where different classes of gel technologies were utilized, such as hydrolysis-condensation of metal-alkoxides, gelation, and organic polymeric gel.
Abstract: This review article focuses on the sol-gel preparation of high temperature superconducting oxides wherein different classes of gel technologies were utilized. These involve: 1) the sol-gel route based upon hydrolysis-condensation of metal-alkoxides, 2) the gelation route based upon concentration of aqueous solutions involving metal-chelates, often called as “chelate gel” or “amorphous chelate” route, and 3) the organic polymeric gel route. This paper reviews the current status of these sol-gel processes, and illustrates the underlying chemistry involved in each sol-gel technology. It is demonstrated that the chemical homogeneity of the gel is often disturbed by the differences in the chemistries of the cations. Prior to gelation the starting precursor solution containing various forms of metal-complexes must be chemically modified to overcome this problem. Illustration of a variety of strategies for success in obtaining a homogeneous multicomponent gel with no precipitation is focal point of this review article.

763 citations

Journal ArticleDOI
TL;DR: In this paper, the development of conductive organic molecular assemblies including organic metals, superconductors, single component conductors, conductive films, and conductive liquids was introduced.
Abstract: We introduce the development of conductive organic molecular assemblies including organic metals, superconductors, single component conductors, conductive films, and conductive liquids, particularl...

356 citations

Journal ArticleDOI
Gilles Triscone1, Jean-Yves Genoud1, T. Graf1, Alain Junod1, Jean Muller1 
TL;DR: In this article, the critical temperature of Bi 2 Sr 2 CaCU 2 O 8+δ (2212) was mapped to the (p, T ) plane for 10 −5 ≤ p ≤ 80 bar (O 2 ) and 300 ≤ T ≤ 840°C.
Abstract: We have mapped the critical temperature of Bi 2 Sr 2 CaCU 2 O 8+δ (2212) in the ( p, T ) plane for 10 −5 ≤ p ≤ 80 bar (O 2 ) and 300 ≤ T ≤ 840°C. Equilibrium conditions are frozen by quenching the samples into liquid gallium. The DC diamagnetic transitions remain sharp, and span an unusual temperature range for the 2212 phase (51.5 K to 94.4 K). This variation is attributed to a measured 2.5% change of the oxygen content ( Δδ ⋍ 0.2 ) in the structure. At the same time, we do not observe any significant variation of the lattice parameters. The Meissner effect, measured in an external magnetic field of 20 Oe, increases with T c . The slope of the normal-state susceptibility ∂ χ / ∂T becomes markedly less negative with decreasing oxygen concentration. It vanishes for the optimum doping that leads to T c ⋍ 94 K .

134 citations

Journal ArticleDOI
TL;DR: A survey of experimental findings for Ce-Cu- and Yb-Cu based compounds is given in this paper, where a successful description of the observed behaviour is possible in terms of the Coqblin-Schrieffer model, which is based on the Anderson Hamiltonian which is more general than the Kondo Hamiltonian.
Abstract: A survey of experimental findings for Ce-Cu- and Yb-Cu-based compounds is given. Most of these compounds exhibit unusual physical properties as a consequence of various competing mechanisms such as a magnetic interaction of the Ruderman-Kittel-Kasuya-Yoshida type, Kondo interaction and crystal-field splitting. The ground-state properties are then dominated by whichever process surpasses the others. A successful description of the observed behaviour is possible in terms of the Coqblin-Schrieffer model, which is based on the Anderson Hamiltonian which is more general than the Kondo Hamiltonian.

133 citations

Journal ArticleDOI
TL;DR: In this article, the present status of electron spectroscopy of Ce and Yb Kondo systems, with particular emphasis on photoemission and inverse photo emission, is reviewed.
Abstract: In this paper we review the present status of electron spectroscopy of Ce and Yb Kondo systems, with particular emphasis on photoemission and inverse photoemission. Our starting point is the situation in the mid-1980s, characterized by the development of a ‘Kondo scenario’ for the thermodynamic and spectral properties, as described in the review by Allen et al. (1986, Adv. Phys., 35, 275). That picture, based on room-temperature results and on a T = 0 approach to the impurity Anderson Hamiltonian, has been generally confirmed and better defined over the past decade by a number of more elaborate experiments, and by new calculational schemes. The use of high-energy resolution and cryogenic temperatures has led to the direct observation of the characteristic low-energy excitations and has opened the way to stringent tests of the most fundamental aspect of model, namely its scaling properties. Despite the success of the Kondo approach, more work remains to be done. The improved quality of the data ha...

102 citations