Magnetic Field Dependence Of The Curie-weiss Paramagnetism In Crv Alloys

The determination of the magnetic properties of antiferromagnetic Cr alloys requires careful consideration of the influence of the applied magnetic field. In this work we show that alloys of Cr-x at. % V present a Curie-Weiss paramagnetism above the Néel temperature, which is suppressed by a characteristic field HL. Samples with x=0.1, 0.2, and 0.4 were investigated through measurements of the magnetic susceptibility as a function of temperature, for different values of the magnetic field. A magnetic phase diagram showing the characteristic line HL vs x at. % V is proposed. © 1997 American Institute of Physics.818 PART 2A42094211Suzuki, T., Takaki, H., (1964) J. Phys. Soc. Jpn., 19, p. 1241Suzuki, T., (1966) J. Phys. Soc. Jpn., 21, p. 442Aidun, R., Arajs, S., Moyer, C.A., (1985) Phys. Status Solidi B, 128, p. 133Hill, P., Ali, N., De Oliviera, A.J.A., Ortiz, W.A., De Camargo, P.C., Fawcett, E., (1994) J. Phys. Condens. Matter., 6, p. 1761De Oliveira, A.J.A., Otriz, W.A., De Camargo, P.C., Galkin, V.Yu., (1996) J. Magn. Magn. Mater., 152, p. 86De Oliveira, A.J.A., De Lima, O.F., De Camargo, P.C., Ortiz, W.A., Fawcett, E., (1996) J. Phys. Condens. Matter., 8, pp. L403Benediktsson, G., Hedman, L., Aström, H.U., Rao, K.V., (1982) J. Phys. F, 12, p. 1439Booth, J.G., (1964) Phys. Status Solidi, 7 K, p. 157Bender, D., Müller, J., (1970) Phys. Kondens. Mater., 10, p. 342Buzdin, A.I., Men'shov, V.N., Tugushev, V.V., (1986) Zh. Eksp. Teor. Fiz., 91, p. 2204(1986) Sov. Phys. JETP, 64. , Engl. TranslTugushev, V.V., (1992) Modulated and Localized Structures of the Spin-Density Wave in Itinerant Antiferromagnets in Electronic Phase Transitions, p. 237. , edited by W. Hanke and Yu. Koapev Elsevier, AmsterdamDe Oliveira, A.J.A., De Lima, O.F., Ortiz, W.A., De Camargo, P.C., (1995) Solid State Commun., 96, p. 383De Oliveira, A.J.A., (1996), PhD. thesis, Universidade Federal de São Carlo

Spin-flip Transition And Magnetic Phase Diagram Of Crv Alloys

The DC magnetic susceptibility of Cr-x at.%V (x = 0, 0.1, 0.2, 0.4 and 0.67) has been measured as a function of temperature. The boundary between the transverse and the longitudinal SDW was obtained, and an upperbound limit for the occurence of spin-flip transition was determined to be x = 0.67. © 1995.966383386Fawcett, Alberts, Galkin, Noakes, Yakmi, (1994) Rev. Mod. Phys., 66, p. 25Fawcett, (1988) Rev. Mod. Phys., 60, p. 209Grier, Shirane, Werner, Magnetic excitations in chromium. II (1985) Physical Review B, 31, p. 2882Fawcett, Robert, Day, White, (1986) Europhys. Lett., 1, p. 473William, Gopal, Street, The specific heat of strained and annealed chromium (1979) Journal of Physics F: Metal Physics, 3 F, p. 431Overhauser, Arrot, (1960) Phys. Rev. Lett., 4, p. 226Machida, Fujitta, (1984) Phys. Rev. B, 30, p. 5284Allen, Young, (1975) Mag. and Mag. Mat. AIP Conf. Proc., 24, p. 410. , C.G. Graham Jr., G.H. Lander, J.J. Rhyne, AIP, NYAllen, Young, (1977) Phys. Rev. B, 16, p. 1103Chiu, Jericho, March, Magnetic Susceptibility and Electrical Resistivity of Dilute Chromium–Titanium Alloys (1971) Canadian Journal of Physics, 49, p. 3010Hedman, Svenson, Rao, Arajs, Aström, (1974) J. of Low Temp. Phys., 14, p. 545Alberts, Lourens, (1984) Phys. Rev. B, 29, p. 5279Baran, Alberts, Strydom, du Plessis, (1992) Phys. Rev. B, 45, p. 10473Alberts, Boshoff, Magneto-elasticity of a Cr + 0.3 at% Ru single crystal through the magnetic transition temperatures (1992) Journal of Magnetism and Magnetic Materials, 104-107, p. 2031Alberts, Lourens, (1988) Journal de Physique, 100–C8, p. 215Koehler, Moon, Trego, Machintosh, (1966) Phys. Rev., 151, p. 405Lebech, Mikke, (1972) J. Phys. Chem. Solids, 33, p. 1651de Camargo, Fawcett, Perz, (1990) J. Appl. Phys., 67 (9), p. 5265Hamaguchi, Wollan, Koehler, (1965) Phys. Rev., 138, p. A737de Camargo, Brotzen, (1982) J. Mag. Magn. Mat., 27, p. 65Hill, Ali, de Oliveira, Ortiz, de Camargo, Fawcett, (1994) J. Phys.: Condens. Matter, 6, p. 1761A. J. A. de Oliveira, W. A. Ortiz, P. C. de Camargo and V. Yu. Galkin, (accepted for publication in J. Mag. Magn. Mat.)Castro, de Camargo, Brotzen, (1986) Solid State Comm., 57, p. 37Köbler, Dubiel, On the magnetic anisotropy of chromium (1985) Zeitschrift f�r Physik B Condensed Matter, 61, p. 257Steinitz, Fawcett, Burleson, Schaefer, Frishman, Marcus, (1972) Phys. Rev. B, 5, p. 3675Cowan, (1978) J. Phys.: Metal Phys., 8, p. 423Kondorskiy, Kostina, Medvedchikov, Kuskova, (1981) Phys. Met. Metall., 48, p. 2

Three new species of Saturniidae (Lepidoptera) from Central Brazil

Three new species of Saturniidae from Central Brazil are described: Cicia norape Becker (Ceratocampinae), Dysdaemonia concisa Becker, and Rhescyntis reducta Camargo & Becker (Arsenurinae)

Suppression Of The Curie-weiss Paramagnetism Seen Above The Néel Transition In Dilute Crv Alloys

The temperature dependence of the AC magnetic susceptibility of antiferromagnetic Cr-x% V (x = 0.0.1, 0.67, 1.0, 1.5) has been investigated in die vicinity of the Néel transition. The behaviour of Cr-0.1% V is similar to that reported previously for the alloys containing 0.2 and 0.4% V, in that the susceptibility above the Néel transition has a component with a temperature dependence that obeys the Curie-Weiss (CW) law. This CW paramagnetism was not however seen in the samples containing higher concentrations of V. The DC susceptibility of Cr-0.2% V was also measured in fields of 2.0, 6.5 and 20.0 kOe, and the high field was found to suppress the CW paramagnetism.829L403L407Fawcett, E., Alberts, H.L., Galkin, V.Yu., Noakes, D.R., Yakhmi, J.V., (1994) Rev. Mod. Phys., 66, p. 25Suzuki, T., (1966) J. Phys. Soc. Japan, 21, p. 442Hedgcock, F.T., Strom-Olsen, J.O., Wilford, D.F., (1977) J. Phys. F: Met. Phys., 7, p. 855Aidun, R., Arajs, S., Moyer, C.A., (1985) Phys. Status Solidi, B128, p. 133Kondorskiy, E.I., Kostina, T.I., Medvedchikov, V.P., Kuskova, Yu.A., (1981) Phys. Met. Metall, 48, p. 27Hill, P., Ali, N., De Oliveira, A.J.A., Ortiz, W.A., De Camargo, P.C., Fawcett, E., (1994) J. Phys.: Condens. Matter, 6, p. 1761De Oliveira, A.J.A., Ortiz, W.A., De Camargo, P.C., Galkin, V.Yu., (1996) J. Magn. Matter. Matter, 152, p. 86Buzdin, A.I., Men'shov, V.N., Tugushev, V.V., (1986) Zh. Eksp. Tear. Fiz., 91, p. 2204(1986) Sov. Phys.-JETP, 64. , Engl. TransiTugushev, V.V., (1992) Modulated and Localizes Structures of the Spin-Density Wave in Itinerant Antiferromagnets in Electronic Phase Transitions, p. 237. , ed W Hanke and Yu V Kopaev (Amsterdam: Elsevier)De Camargo, P.C., Ehlert, J.A., Brotzen, F.R., (1982) J. Cryst. Growth, 57, p. 241De Camargo, P.C., Brotzen, F.R., (1982) J. Magn. Magn. Matter, 27, p. 65De Castro, E.P., De Camargo, P.C., Brotzen, F.R., (1986) Solid State Commun., 97, p. 37De Oliveira, A.J.A., De Lima, O.F., Ortiz, W.A., De Camargo, P.C., (1995) Solid State Commun., 96 (6), p. 383De Oliveira, A.J.A., (1993) Master Thesis, , Universidade Federal de São CarlosGelfuso, V.C., Ortiz, W.A., Meas. Sci. Technol, , submittedMaxwell, E., (1965) Rev. Sci. Instrum., 36, p. 553McKim, F.R., Wolf, W.P., (1957) J. Sci. Instr., 34, p. 64De Faria, C.C., De Oliveira, A.J.A., Moreira, F.M.A., Ortiz, W.A., (1995) IEEE Trans. Magn. MAG-3, p. 3403Hedman, L., (1995), private communicationHattox, T.M., Conclin, J.M., Slater, J.C., Tnchi, S.B., (1973) J. Phys. Chem. Solids, 34, p. 1627Creveling Jr., L., Luo, H.L., (1968) Phys. Rev., 176, p. 14Creveling Jr., L., Luo, H.L., (1969) Phys. Lett., 28 A, p. 72Rau, C., Xing, G., Liu, C., Robert, M., (1989) Phys. Lett. A, 135, p. 227Nait-Laziz, H., Demagrat, C., Mobran, A., (1993) J. Magn. Magn. Matter, 121, p. 1

Investigation Of The Spin-density-wave And Charge-density-wave In Antiferromagnetic Cr And Cr-0. 2 At. %v Using X-ray Diffraction

Chromium and Chromium-0. 2at%Vanadium single crystals were investigated using synchrotron radiation at energies of 5. 8 KeV and 13. 04 KeV. A description of the spin-density-wave (SDW) and charge-density-wave (CDW) peaks and their temperature dependence for Cr-0. 2at%V is presented. A single Q state was observed for all measurements on a (100) surface. Results for pure chromium are compared with those for the alloy. © 1999 Trans Tech Publications,.302-3033337Fawcett, E., (1988) Rev. Modern Phys., 60, p. 209Fawcett, E., Alberts, H.L., Yu Galkin, V., Noakes, D.R., Yakhmi, J.V., (1994) Rev. Mod. Phys., 66, p. 25Noakes, D.R., Holden, T.M., Fawcett, E., De Camargo, P.C., (1990) Phys. Rev. Letters, 65, p. 369Noakes, D.R., Holden, T.M., Fawcett, E., (1990) J. Appl. Phys., 67, p. 5262Hill, J.P., Helgensen, G., Gibbs, D., (1995) Phys. Rev. B., 51, p. 10336Castro, E.P., De Camargo, P.C., Brotzen, F.R., (1986) Solid State Commun., 57, p. 37De Camargo, P.C., Castro, E.P., Fawcett, E., (1988) J. Phys. F: Met. Phys., 18, pp. L219De Oliveira, A.J.A., Ortiz, W.A., De Camargo, P.C., Yu Galkin, V., (1996) J. Magn. Magn. Matter, 152, p. 86Tsunoda, Y., Mon, M., Kunitomi, N., Teraoka, Y., Kanamori, J., (1974) Solid State Commun., 14, p. 28

Investigation Of Antiferromagnetic Domains In Cr

Incommensurate spin-density wave (SDW) in chromium presents Q-domain configurations that can be studied through X-ray diffraction (XRD) due to charge-density wave satellites at (0 0 1) and (1 1 1) crystal faces. In the present work, we investigated superficial domains reorientation in the bulk multi-Q state, after the crystal had been maintained in the bulk single-Q state artificially prepared by field cooling under 90 kOe applied in (0 1 0)direction. Reciprocal lattice scans were performed along the three directions H, K and L to ensure proper CDW satellite measurements. Our results are in agreement with previous experiments where observed that the preferential orientation of CDW occurs naturally with Q perpendicular to the surface, parallel to (1 0 0). © 2006 Elsevier B.V. All rights reserved.3102 SUPPL. PART 2e316e318Fawcett, E., (1988) Rev. Mod. Phys., 60, p. 209Mori, M., Tsunoda, Y., (1993) J. Phys.: Condens. Matter, 5, pp. L77de Camargo, P.C., (2001) J. Magn. Magn. Mater., 233, p. 265Baruchel, J., (2001) J. Phys. D:, 34, pp. A11

Magnetic Photon Diffraction of the Chromium Spin Density Wave.

Abstract not availableJRC.E-Institute for Transuranium Elements (Karlsruhe