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Author (up) Encina, S.; Pedrazzini, P.; Sereni, J.G.; Geibel, C.
Title Low temperature thermopower and magnetoresistance of Sc-rich CeSc1-xTixGe Type Journal Article
Year 2018 Publication Physica B: Condensed Matter Abbreviated Journal Physica B
Volume 536 Issue Pages 133-136
Keywords CeScGe; CeTiGe; Antiferromagnetism; Transport properties; Low temperatures; Magnetic field
Abstract In CeSc1-xTixGe, Ti-alloying reduces the record-high antiferromagnetic (AFM) ordering temperature found in CeScGe at TN=46K and induces ferromagnetism for x≥0.5. In this work we focus on the AFM side, i.e. Sc-rich samples, and study their thermopower S(T) and magnetoresistance ρ(H,T). The measured S(T) is small in comparison with the thermopower of other Ce-systems and shows some features that are compatible with a weak hybridization between the 4f and band states. This is a further hint pointing to the local character of magnetism in this alloy. Magnetic fields up to 16T have a minor effect on the electrical resistivity of stoichiometric CeScGe. On the other hand, for x=0.65, we find that fields above 4T suppress the hump in ρ(T). Furthermore, the 4.2K magnetoresistance displays a strong decrease in the same field range, also in coincidence with magnetization results from the literature. Our results indicate that ρ(T,H) is a proper tool to assess the H−T phase diagram of this system.
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ISSN 0921-4526 ISBN Medium
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Call Number BT @ pedrazp @ Serial 765
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Author (up) Rigal, L.B.; Schmadel, D.C.; Drew, H.D.; Maiorov, B.; Osquiguil, E.; Preston, J.S.; Hughes, R.; Gu, G.D.
Title Magneto-optical evidence for a gapped Fermi surface in underdoped YBa 2Cu3O6+x Type Journal Article
Year 2004 Publication Physical Review Letters Abbreviated Journal Phys Rev Lett
Volume 93 Issue 13 Pages
Keywords Antiferromagnetism; Carrier concentration; Cyclotrons; Doping (additives); Faraday effect; Hall effect; High temperature superconductors; Magnetic susceptibility; Magnetooptical effects; Photoemission; Yttrium barium copper oxides; Fermi arcs; Hall frequency; Magnetic excitations; Photoemission spectroscopy; Fermi surface
Abstract An evidence presented that supports partial gapping of the Fermi surface by a measurement of the Hall frequency from high frequency magneto-optical measurements on underdoped YBa2Cu3O6+x (YBCO) was discussed. It was found that the Hall frequency was obtained independently of the unknown k-space dependence of the carrier scattering rates that complicated the dc Hall effect. It was observed that the frequency dependence of the Hall angle was Drude-like and indicated a quasielastic relaxation process for optimal and underdoped samples. The results show that there was an increase of the Hall frequency in the pseudogap state.
Address Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, United States
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ISSN 00319007 (ISSN) ISBN Medium
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Notes Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PRLTA; doi: 10.1103/PhysRevLett.93.137002; Language of Original Document: English; Correspondence Address: Rigal, L.B.; Department of Physics; University of Maryland College Park, MD 20742, United States; References: Timusk, T., Statt, B., (1999) Rep. Prog. Phys., 62, p. 61; Tallon, J.L., Loram, J.W., (2001) Physica (Amsterdam), 349 C, p. 53; Damascelli, A., Hussain, Z., Shen, Z.-X., (2003) Rev. Mod. Phys., 75, p. 473; Chakravarty, S., Nayak, C., Tewari, S., (2003) Phys. Rev. B, 68, pp. 100504R; Chakravarty, S., (2002) Phys. Rev. Lett., 89, p. 277003; Tranquada, J., (1995) Nature (London), 375, p. 561; Tranquada, J., (1997) Phys. Rev. Lett., 78, p. 338; Orenstein, J., Millis, A.J., (2000) Science, 288, p. 468; Brinkman, W.F., Rice, T.M., (1971) Phys. Rev. B, 4, p. 1566; Lange, E., Eotliar, G., (1999) Phys. Rev. Lett., 82, p. 1317; Cerne, J., (2003) Rev. Sci Instrum., 74, p. 4755; Rotter, L.D., (1991) Phys. Rev. Lett., 67, p. 2741; Schutzmann, J., (1992) Phys. Rev. B, 46, p. 512; Cooper, S.L., (1992) Phys. Rev. B, 45, p. 2549; Cerne, J., (2000) Phys. Rev. B, 61, p. 8133; Cerne, J., (2000) Phys. Rev. Lett., 84, p. 3418; Konstantinovic, Z., Li, Z.Z., Raffy, H., (2000) Phys. Rev. B, 62, pp. R11 989; Hwang, H.Y., (1994) Phys. Rev. Lett., 72, p. 2636; Chien, T.R., Wang, Z.Z., Ong, N.P., (1991) Phys. Rev. Lett., 67, p. 2088; Harris, J.M., Tan, Y.F., Ong, N.P., (1991) Phys. Rev. B, 46, p. 14293; Zheleznyak, A.T., (1998) Phys. Rev. B, 57, p. 3089; Shen, Z.X., Dassau, D., (1995) Phys. Rep., 253, p. 1; Schabel, M.C., (1998) Phys. Rev. B, 57, p. 6090; (1998) Phys. Rev. B, 57, p. 6107; Johnson, P.D., (2001) Phys. Rev. Lett., 87, p. 177007; S. Tewari et al., cond-mat/0310165Cooper, S.L., (1993) Phys. Rev. B, 47, p. 8233; Orenstein, J., (1990) Phys. Rev. B, 42, p. 6342; Puchkov, A.V., Basov, D.N., Timusk, T., (1996) J. Phys. Condens. Matter, 8, p. 10049 Approved no
Call Number BT @ osquigui @ Serial 366
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