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742 results on '"Tholence, J. -L"'

14. Pressure-induced enhancement of Tc above 150 K in Hg-1223

Author

Nunez-Regueiro, M., Tholence, J.-L., Antipov, E.V., Capponi, J.-J., and Marezio, M.

Subjects
High temperature superconductors -- Research, Mercury compounds -- Research, Science and technology, Research
Abstract

The recently discovered homologous series [HgBa.sub.2][Ca.sub.n-1][Cu.sub.n][O.sub.2n+2+δ] possesses remarkable properties. A superconducting transition temperature, [T.sub.c] as high as 133 kelvin has been measured in a multiphase Hg-Ba-Ca-Cu-O sample and found to be attributable to the Hg-1223 compound. Temperature-dependent electrical resistivity measurements under pressure on a (>95%) pure Hg-1223 phase are reported. These data show that [T.sub.c] increases steadily with pressure at a rate of about 1 kelvin per gigapascal up to 15 gigapascals, then more slowly and reaches a [T.sub.c] = 150 kelvin, with the onset of the transition at 157 kelvin, for 23.5 gigapascals. This large pressure variation (as compared to the small effects observed in similar compounds with the optimal [T.sub.c]) strongly suggests that higher critical temperatures could be obtained at atmospheric pressure., In analogy with the Bi- and Tl-based superconducting copper oxides, the structures of the [HgBa.sub.2][Ca.sub.n-1][CU.sub.n][O.sub.2n+2+δ], series are constructed with n [CuO.sub.2] layers sandwiched between rock-salt (BaO)([HgO.sub.δ,)(BaO) blocks. In comparison with [...]

Published
1993

18. Critical current density and flux pinning in Ho-doped melt-processed YBa2Cu3Oy.

Author

Feng, Yong, Zhou, Lian, Du, Shejun, Wu, Xiaozu, Tholence, J. L., Vallier, J. C., Monceau, P., Yin, B., Li, Jinwei, Zhao, Zhongxian, and Zhang, Yuheng

Subjects
CRITICAL currents, FLUX pinning, HOLMIUM, YTTRIUM, BARIUM
Abstract

Studies the effects of critical current density and flux pinning in holmium-doped melt-processed YBa[sub2]Cu[sub3]O[suby]. Experimental methods; Results and discussion; Conclusion.

Published
1996
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19. Quantum tunneling in magnetic systems of various sizes (invited).

Author

Barbara, B., Sampaio, L. C., Wegrowe, J. E., Ratnam, B. A., Marchand, A., Paulsen, C., Novak, M. A., Tholence, J. L., Uehara, M., and Fruchart, D.

Subjects
FERROMAGNETISM, NANOPARTICLES, CRYSTALS, MAGNETIZATION
Abstract

Presents a study which examined the low temperature relaxation in ferromagnetic nanoparticles, layers and multi layers and large single crystals. Discussion on the quantum tunneling of the magnetization; Experimental procedure followed; Details on the quantum tunneling of domain walls in Tb[0.5]Ce[0.5]Fe[sub2] particles; Characteristics of the iron/silver and FeTb/Cu amorphous multi layers; Realization of domain wall junctions.

Published
1993
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25. Transport properties of the transverse charge-density-wave system Fe3 O2 BO3

Author

Fernandes, J. C., Guimarães, R. B., Continentino, M. A., Ziemath, E. C. [UNESP], Walmsley, L. [UNESP], Monteverde, M., Núñez-Regueiro, M., Tholence, J. L., Dumas, J., Universidade Federal Fluminense (UFF), Universidade Estadual Paulista (UNESP), Ciudad Universitaria, and CNRS

Abstract

Made available in DSpace on 2022-04-28T20:07:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-08-15 We study the transport properties of the charge-density-wave system Fe3 O2 BO3. ac conductivity measurements for different frequencies are presented for temperatures above and below the structural transition. dc conductivity, as a function of temperature and pressure, yields the variation of the transition temperature with external pressure. Below this transition the conductivity is thermally activated in a wide range of temperature and the gap obtained is strongly pressure dependent. The ac conductivity at sufficiently low temperatures below the transition is ascribed to the excitation of local defects associated with domain walls and which are characteristic of the one-dimensional nature of the Fe3 O2 BO3 system. © 2005 The American Physical Society. Instituto de Física Universidade Federal Fluminense, Niterói, RJ, 24.210-340 Departamento de Fisica - IGCE - Rio Claro Universidade Estadual Paulista - UNESP, Rua 10, 2527 - Bairro Santana, CEP 13500-230 - Rio, Claro - SP Consejo Nacional de Investigaciones Cientificas Y Tecnicas Laboratorio de Bajas Temperaturas Departamento de Fisica - FCEyN - UBA Ciudad Universitaria, PAB I (C1428EHA) Buenos Aires Centre de Recherches Sur Les Tres Basses Temperatures CNRS, BP166, 38042 Grenoble Cedex 9 Laboratoire d'Etudes des Propriétés Electroniques des Solides CNRS, BP 166, 38042 Grenoble, Cedex 9 Departamento de Fisica - IGCE - Rio Claro Universidade Estadual Paulista - UNESP, Rua 10, 2527 - Bairro Santana, CEP 13500-230 - Rio, Claro - SP

Published
2005

27. Localization and magnetic properties in cerium compounds.

Author

Tholence, J. L., Haen, P., Jaccard, D., Lejay, P., Flouquet, J., and Braun, H. F.

Subjects
*FERMIONS, *CERIUM group, *THERMOELECTRICITY
Abstract

Examines the magnetic and transport measurements on fermion compounds CeAl[sub3], CeCu[sub2]Si[sub2] and CeRu[sub2]Si[sub2]. Resistivity and thermoelectric power of the compounds; Annealing of the cerium compounds.

Published
1985
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32. Magnetic properties of amorphous Cr–Fe alloys prepared by thermal evaporation and mechanical milling.

Author

Xia, S. K., Baggio-Saitovitch, E., Larica, C., Sarkissian, B. V. B., Cunha, S. F., and Tholence, J. L.

Subjects
MAGNETIZATION, CHROMIUM, IRON, MOSSBAUER effect
Abstract

Presents a study that investigated the magnetic behaviors of the chromium (Cr)-iron (Fe) amorphous state through the analyses of the M&oml;ssbauer spectra, the ac susceptibility and the magnetization measurements. Preparation of Cr[sub100-x]Fe[subx] amorphous alloys; Comparison of Fe magnetic moment between amorphization and crystalline bulk samples; Factors that affect of a spin-glass-like behavior.

Published
1994
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33. Magnetic field dependence of the cyclotron effective mass in the Kondo lattice CeB6.

Author

Joss, W., van Ruitenbeek, J. M., Crabtree, G. W., Tholence, J. L., van Deursen, A. P. J., and Fisk, Z.

Subjects
MAGNETIC fields, CYCLOTRONS, KONDO effect, FERMIONS, ELECTRONS
Abstract

Presents a study that observed the magnetic field dependence of the cyclotron effective mass in the Kondo lattice CeB[sub6]. Description of heavy fermion materials; Methods used to determine the mean free path of electrons on the space orbit; Effect observed on thermal cycling of the samples.

Published
1988
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34. Quenching of ferrimagneticlike ordering in SrCr8Fe4O19 hexagonal ferrite.

Author

Obradors, X., Labarta, A., Tejada, J., Pernet, M., Tholence, J. L., Saint-Paul, M., and Barbara, B.

Subjects
STRONTIUM compounds, METAL quenching, FERRIMAGNETISM, ORDER-disorder in alloys, FERRITES
Abstract

Presents a study which examined the quenching of ferrimagnetic-like ordering in strontium chromium[sub8]iron[sub4]oxygen[sub19] hexagonal ferrite. Experimental procedure; Results; discussion.

Published
1988
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35. Spin-glass properties in the dilute semiconductor Sn1-x MnxTe.

Author

Escorne, M., Godinho, M., Tholence, J. L., and Mauger, A.

Subjects
FERROMAGNETISM, DILUTED magnetic semiconductors
Abstract

Presents information on a study that examined magnetic properties of the ferromagnetic semiconductor, Tin[sub1-x]Manganese[subx]tellurium. Experimental procedures; Conclusions.

Published
1985
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41. High magnetic field facility in Grenoble

Author

Aubert, G, primary, Debray, F, additional, Dumas, J, additional, Joss, W, additional, Krämer, S, additional, Martinez, G, additional, Mossang, E, additional, Petmezakis, P, additional, Sala, P, additional, Tholence, J L, additional, Trophime, C, additional, and Vidal, N, additional

Published
2006
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45. Structure and magnetism ofMnMgB2O5andMn2B2O5

Author

Fernandes, J. C., primary, Sarrat, F. S., additional, Guimarães, R. B., additional, Freitas, R. S., additional, Continentino, M. A., additional, Doriguetto, A. C., additional, Mascarenhas, Y. P., additional, Ellena, J., additional, Castellano, E. E., additional, Tholence, J-L., additional, Dumas, J., additional, and Ghivelder, L., additional

Published
2003
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48. Jahn–Teller distortion and magnetoresistance in Sr[sub 1-x]Ce[sub x]MnO[sub 3].

Author

Sundaresan, A., Tholence, J. L., Maignan, A., Martin, C., Hervieu, M., Raveau, B., Suard, E., Eto, T., Honda, F., and Oomi, G.

Subjects
*METAL complexes, *JAHN-Teller effect, *MAGNETORESISTANCE
Abstract

Structural, magnetic and electrical transport properties of Sr[sub 1−x]Ce[sub x]MnO[sub 3] (x = 0, 0.1, 0.2, 0.3 and 0.4) have been investigated. For x = 0.1, it undergoes a first-order structural and metal-insulator transitions due to Jahn-Teller ordering (T[sub JT] ∼ 315 K) which stabilizes C-type antiferromagnetic ground state (T[sub N] = 290 K) that is insensitive to an applied magnetic field of 7 T. With increasing x, the Jahn-Teller distortion decreases and a small magnetoresistance appear. However, there is no ferromagnetism or colossal mangnetoresistance in any of these materials due to the stability of the JT distortion and C-type antiferromangetism. [ABSTRACT FROM AUTHOR]

Published
2001

49. Structural instability in Ba[sub 1-x]K[sub x]BiO[sub 3].

Author

Gusakov, V., Zherlitsyn, S., Lu¨thi, B., Wolf, B., Ritter, F., Wichert, D., Bruls, G., Barilo, S., Shiryaev, S., Escribe-Filippini, C., and Tholence, J. L.

Subjects
CRYSTALS spectra, HYSTERESIS, ELECTRONIC structure
Abstract

We report results of the ultrasonic investigation of Ba[sub 1−x]K[sub x]BiO[sub 3] single crystals for two potassium concentrations x ≈ 0.35 and x ≈ 0.47 in a wide temperature range. The softening of both the transverse c[sub 44] and the longitudinal c[sub 11] modes have been observed at temperatures between 200 K and 50 K. In the case of Ba[sub 0.65]K[sub 0.35]BiO[sub 3] a pronounced hysteresis was discovered. We proposed a model in which the softening of the elastic moduli, the hysteresis, and the maximum in the attenuation of sound can be explained by assuming a coupling of the acoustic modes with the anharmonic oscillations of O[sub 6] octahedra. [ABSTRACT FROM AUTHOR]

Published
2001

50. Magnetic interactions in the ludwigiteNi2FeO2BO3

Author

Fernandes, J. C., primary, Guimarães, R. B., additional, Continentino, M. A., additional, Borges, H. A., additional, Sulpice, A., additional, Tholence, J-L., additional, Siqueira, J. L., additional, Zawislak, L. I., additional, da Cunha, J. B. M., additional, and dos Santos, C. A., additional

Published
1998
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