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Rusydi A, Goos A, Binder S, Eich A, Botril K, Abbamonte P, Yu X, Breese MBH, Eisaki H, Fujimaki Y, Uchida S, Guerassimova N, Treusch R, Feldhaus J, Reininger R, Klein MV, Rübhausen M. Electronic screening-enhanced hole pairing in two-leg spin ladders studied by high-resolution resonant inelastic x-ray scattering at Cu M edges. Phys Rev Lett 2014; 113:067001. [PMID: 25148343 DOI: 10.1103/physrevlett.113.067001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Indexed: 05/23/2023]
Abstract
We study the electronic screening mechanisms of the effective Coulomb on-site repulsion in hole-doped Sr(14)Cu(24)O(41) compared to undoped La(6)Ca(8)Cu(24)O(41) using polarization dependent high-resolution resonant inelastic x-ray scattering at Cu M edges. By measuring the energy of the effective Coulomb on-site repulsion and the spin excitations, we estimate superexchange and hopping matrix element energies along rungs and legs, respectively. Interestingly, hole doping locally screens the Coulomb on-site repulsion reducing it by as much as 25%. We suggest that the increased ratio of the electronic kinetic to the electronic correlation energy contributes to the local superexchange mediated pairing between holes.
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Affiliation(s)
- A Rusydi
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany and NUSSNI-NanoCore, Department of Physics, National University of Singapore, Singapore 117542, Singapore and Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore
| | - A Goos
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany
| | - S Binder
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany
| | - A Eich
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany
| | - K Botril
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany
| | - P Abbamonte
- Physics Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
| | - X Yu
- Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore
| | - M B H Breese
- NUSSNI-NanoCore, Department of Physics, National University of Singapore, Singapore 117542, Singapore and Singapore Synchrotron Light Source, National University of Singapore, Singapore 117603, Singapore
| | - H Eisaki
- Nanoelectronics Research Institute, AIST, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Y Fujimaki
- Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
| | - S Uchida
- Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
| | - N Guerassimova
- Photon Science, DESY, Notkestraße 85, D-22607 Hamburg, Germany
| | - R Treusch
- Photon Science, DESY, Notkestraße 85, D-22607 Hamburg, Germany
| | - J Feldhaus
- Photon Science, DESY, Notkestraße 85, D-22607 Hamburg, Germany
| | - R Reininger
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M V Klein
- Physics Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
| | - M Rübhausen
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany and Center for Free Electron Laser Science (CFEL), Notkestraße 85, D-22607 Hamburg, Germany and NUSSNI-NanoCore, Department of Physics, National University of Singapore, Singapore 117542, Singapore
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Blumberg G, Mialitsin A, Dennis BS, Klein MV, Zhigadlo ND, Karpinski J. Observation of Leggett's collective mode in a multiband MgB2 superconductor. Phys Rev Lett 2007; 99:227002. [PMID: 18233316 DOI: 10.1103/physrevlett.99.227002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Indexed: 05/25/2023]
Abstract
We report observation of Leggett's collective mode in a multiband MgB2 superconductor with Tc=39 K arising from the fluctuations in the relative phase between two superconducting condensates. The novel mode is observed by Raman spectroscopy at 9.4 meV in the fully symmetric scattering channel. The observed mode frequency is consistent with theoretical considerations based on first-principles computations.
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Affiliation(s)
- G Blumberg
- Bell Laboratories, Alcatel-Lucent, Murray Hill, New Jersey 07974, USA.
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Budelmann D, Schulz B, Rübhausen M, Klein MV, Williamsen MS, Guptasarma P. Gaplike excitations in the superconducting state of Bi2Sr2CaCu2O8 studied by resonant Raman scattering. Phys Rev Lett 2005; 95:057003. [PMID: 16090910 DOI: 10.1103/physrevlett.95.057003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2005] [Indexed: 05/03/2023]
Abstract
We report on the response of the electronic continuum from inelastic light-scattering experiments over an extended energy range between 1.970 and 4.504 eV in the superconducting state of Bi2Sr2CaCu2O8. The formation of a substantial Raman feature at shifts below twice the superconducting gap as well as the additional weight above this energy are found to be strongly dependent on the incident photon energy. For excitation wavelengths observed in ultraviolet, we find an enhancement of the integrated spectral weight below T(c). The resulting composite feature shows three distinct resonances at 2.5, 3.3, and 3.8 eV. We strongly suggest that the superconductivity-induced changes are the result of both the opening of a superconducting gap and the appearance of a collective mode.
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Affiliation(s)
- D Budelmann
- Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg, Germany
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Bairamov BH, Evarestov RA, Kitaev YE, Jahne E, Delaney M, Gant TA, Klein MV, Levi D, Klem J, Morkoc H. Site group analysis of normal modes in semiconductor superlattices. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100179a046] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- M. V. Klein
- M. V. Klein is at the NSF Science and Technology Center for Superconductivity and the Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801-3080, USA
| | - G. Blumberg
- G. Blumberg is at Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA
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Blumberg G, Kang M, Klein MV, Kadowaki K, Kendziora C. Evolution of magnetic and superconducting fluctuations with doping of high-Tc superconductors. Science 1997; 278:1427-32. [PMID: 9367948 DOI: 10.1126/science.278.5342.1427] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Electronic Raman scattering from high- and low-energy excitations was studied as a function of temperature, extent of hole doping, and energy of the incident photons in Bi2Sr2CaCu2O8+/-delta superconductors. For underdoped superconductors, short-range antiferromagnetic (AF) correlations were found to persist with hole doping, and doped single holes were found to be incoherent in the AF environment. Above the superconducting (SC) transition temperature Tc, the system exhibited a sharp Raman resonance of B1g symmetry and energy of 75 millielectron-volts and a pseudogap for electron-hole excitations below 75 millielectron-volts, a manifestation of a partially coherent state forming from doped incoherent quasi particles. The occupancy of the coherent state increases with cooling until phase ordering at Tc produces a global SC state.
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Affiliation(s)
- G Blumberg
- G. Blumberg, NSF Science and Technology Center for Superconductivity and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA, and Institute of Chemical Physics and Biophysics, Tallinn EE0001, Estoni
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Kang M, Blumberg G, Klein MV, Kolesnikov NN. Resonance Raman Study of the Superconducting Gap and Low Energy Excitations in Tl2Ba2CuO6+ delta Superconductors. Phys Rev Lett 1996; 77:4434-4437. [PMID: 10062537 DOI: 10.1103/physrevlett.77.4434] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Maksimov AA, Pronin DA, Zaitsev SV, Tartakovskii II, Blumberg G, Klein MV, Karlow M, Cooper SL, Paulikas AP, Veal BW. Influence of oxygen-ordering kinetics on Raman and optical response in YBa2Cu3O6.4. Phys Rev B Condens Matter 1996; 54:R6901-R6904. [PMID: 9984409 DOI: 10.1103/physrevb.54.r6901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wang YY, Zhang FC, Dravid VP, Ng KK, Klein MV, Schnatterly SE, Miller LL. Momentum-Dependent Charge Transfer Excitations in Sr2CuO 2Cl2 Angle-Resolved Electron Energy Loss Spectroscopy. Phys Rev Lett 1996; 77:1809-1812. [PMID: 10063177 DOI: 10.1103/physrevlett.77.1809] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Blumberg G, Stojkovic BP, Klein MV. Erratum: Antiferromagnetic excitations and van Hove singularities in YBa2Cu3O6+x. Phys Rev B Condens Matter 1996; 53:14664. [PMID: 9983270 DOI: 10.1103/physrevb.53.14664] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blumberg G, Abbamonte P, Klein MV, Lee WC, Ginsberg DM, Miller LL, Zibold A. Resonant two-magnon Raman scattering in cuprate antiferromagnetic insulators. Phys Rev B Condens Matter 1996; 53:R11930-R11933. [PMID: 9982890 DOI: 10.1103/physrevb.53.r11930] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lee H, Klein MV, Olson JM, Hsieh KC. CuPt-type ordering and dopant effect of In0.5Ga0.5P/GaAs using spectroscopic ellipsometry. Phys Rev B Condens Matter 1996; 53:4015-4022. [PMID: 9983956 DOI: 10.1103/physrevb.53.4015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Salamon D, Abbamonte P, Liu R, Klein MV, Lee WC, Ginsberg DM, Tartakovskii II, Veal BW. Large-shift Raman scattering features in superconducting YBa2Cu3O6+x. Phys Rev B Condens Matter 1996; 53:886-891. [PMID: 9983045 DOI: 10.1103/physrevb.53.886] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Blumberg G, Stojkovic BP, Klein MV. Antiferromagnetic excitations and van Hove singularities in YBa2Cu3O6+x. Phys Rev B Condens Matter 1995; 52:15741-15744. [PMID: 9980946 DOI: 10.1103/physrevb.52.r15741] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wang YY, Dravid VP, Bulut N, Han PD, Klein MV, Schnatterly SE, Zhang FC. Momentum-transfer-resolved electron energy loss spectroscopy of BaBiO3: anisotropic dispersion of threshold excitation and optically forbidden transition. Phys Rev Lett 1995; 75:2546-2549. [PMID: 10059339 DOI: 10.1103/physrevlett.75.2546] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Gao F, Whitaker JF, Liu Y, Uher C, Platt CE, Klein MV. Terahertz transmission of a Ba1-xKxBiO3 film probed by coherent time-domain spectroscopy. Phys Rev B Condens Matter 1995; 52:3607-3613. [PMID: 9981486 DOI: 10.1103/physrevb.52.3607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Salamon D, Liu R, Klein MV, Karlow MA, Cooper SL, Cheong SW, Lee WC, Ginsberg DM. Large-shift Raman scattering in insulating parent compounds of cuprate superconductors. Phys Rev B Condens Matter 1995; 51:6617-6633. [PMID: 9977196 DOI: 10.1103/physrevb.51.6617] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Lee H, Klein MV, Fu LP, Gilliland GD, Hjalmarson HP, Aspnes DE, Hsieh KC, Kim J, Yu JG, Craford MG. Observation of quasidirect transitions in In1-xGaxP/graded GaP (0.58 <= x <= 0.75) alloys near the Gamma -X1 crossover. Phys Rev B Condens Matter 1995; 51:4186-4192. [PMID: 9979257 DOI: 10.1103/physrevb.51.4186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kong SH, Klein MV, Tsui F, Flynn CP. Brillouin-light-scattering study of long-wavelength acoustic phonons in single-crystal dysprosium films. Phys Rev B Condens Matter 1994; 50:18497-18504. [PMID: 9976285 DOI: 10.1103/physrevb.50.18497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim YD, Cooper SL, Klein MV, Park J, Jonker BT. Spectroscopic ellipsometry study of Zn1-xCoxSe alloys grown on GaAs. Phys Rev B Condens Matter 1994; 50:10637-10643. [PMID: 9975160 DOI: 10.1103/physrevb.50.10637] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Maksimov AA, Tartakovskii II, Klein MV, Veal BW. Two-magnon light scattering in YBa2Cu3O6+x single crystals near the metal-insulator transition. Phys Rev B Condens Matter 1994; 49:15385-15387. [PMID: 10010661 DOI: 10.1103/physrevb.49.15385] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Blumberg G, Liu R, Klein MV, Lee WC, Ginsberg DM, Gu C, Veal BW, Dabrowski B. Two-magnon Raman scattering in cuprate superconductors: Evolution of magnetic fluctuations with doping. Phys Rev B Condens Matter 1994; 49:13295-13298. [PMID: 10010263 DOI: 10.1103/physrevb.49.13295] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim YD, Klein MV, Ren SF, Chang YC, Luo H, Samarth N, Furdyna JK. Optical properties of zinc-blende CdSe and ZnxCd1-xSe films grown on GaAs. Phys Rev B Condens Matter 1994; 49:7262-7270. [PMID: 10009464 DOI: 10.1103/physrevb.49.7262] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim YD, Cooper SL, Klein MV, Jonker BT. Spectroscopic ellipsometry study of the diluted magnetic semiconductor system Zn(Mn,Fe,Co)Se. Phys Rev B Condens Matter 1994; 49:1732-1742. [PMID: 10010966 DOI: 10.1103/physrevb.49.1732] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kim YD, Chang YC, Klein MV. Effect of d electrons in transition-metal ions on band-gap energies of diluted magnetic semiconductors. Phys Rev B Condens Matter 1993; 48:17770-17775. [PMID: 10008407 DOI: 10.1103/physrevb.48.17770] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Liu R, Salamon D, Klein MV, Cooper SL, Lee WC, Cheong SW, Ginsberg DM. Novel Raman-active electronic excitations near the charge-transfer gap in insulating cuprates. Phys Rev Lett 1993; 71:3709-3712. [PMID: 10055052 DOI: 10.1103/physrevlett.71.3709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Reznik D, Cooper SL, Klein MV, Lee WC, Ginsberg DM, Maksimov AA, Puchkov AV, Tartakovskii II, Cheong SW. Plane-polarized Raman continuum in the insulating and superconducting layered cuprates. Phys Rev B Condens Matter 1993; 48:7624-7635. [PMID: 10006932 DOI: 10.1103/physrevb.48.7624] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Karlow MA, Cooper SL, Kotz AL, Klein MV, Han PD, Payne DA. Optical conductivity of Ba1-xKxBiO3 through the metal-semiconductor transition. Phys Rev B Condens Matter 1993; 48:6499-6505. [PMID: 10009200 DOI: 10.1103/physrevb.48.6499] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Salamon D, Liu R, Klein MV, Groenke DA, Poeppelmeier KR, Dabrowski B, Han PD, Payne DA. Raman-scattering results from Y1-xCaxSr2Cu2GaO7. Phys Rev B Condens Matter 1993; 47:12242-12247. [PMID: 10005397 DOI: 10.1103/physrevb.47.12242] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cooper SL, Reznik D, Kotz A, Karlow MA, Liu R, Klein MV, Lee WC, Giapintzakis J, Ginsberg DM, Veal BW, Paulikas AP. Optical studies of the a-, b-, and c-axis charge dynamics in YBa2Cu3O6+x. Phys Rev B Condens Matter 1993; 47:8233-8248. [PMID: 10004836 DOI: 10.1103/physrevb.47.8233] [Citation(s) in RCA: 253] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Cooper SL, Nyhus P, Reznik D, Klein MV, Lee WC, Ginsberg DM, Veal BW, Paulikas AP, Dabrowski B. Interbilayer charge dynamics in YBa2Cu3O6+x. Phys Rev Lett 1993; 70:1533-1536. [PMID: 10053316 DOI: 10.1103/physrevlett.70.1533] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Reznik D, Klein MV, Lee WC, Ginsberg DM, Cheong SW. Effect of conduction electrons on the polarized Raman spectra of copper oxide superconductors. Phys Rev B Condens Matter 1992; 46:11725-11729. [PMID: 10003063 DOI: 10.1103/physrevb.46.11725] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kong SH, Klein MV, Tsui F, Flynn CP. Brillouin-light-scattering study of long-wavelength spin waves in a single-crystal 300-Å gadolinium film. Phys Rev B Condens Matter 1992; 45:12297-12305. [PMID: 10001266 DOI: 10.1103/physrevb.45.12297] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Liu R, Klein MV, Han PD, Payne DA. Raman scattering from Ag and B1g phonons in Bi2Sr2Can-1CunO2n+4 (n=1,2). Phys Rev B Condens Matter 1992; 45:7392-7396. [PMID: 10000516 DOI: 10.1103/physrevb.45.7392] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Levi DH, Wake DR, Klein MV, Kumar S, Morkoç H. Density dependence of nonresonant tunneling in asymmetric coupled quantum wells. Phys Rev B Condens Matter 1992; 45:4274-4279. [PMID: 10002042 DOI: 10.1103/physrevb.45.4274] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Cooper SL, Kotz AL, Karlow MA, Klein MV, Lee WC, Giapintzakis J, Ginsberg DM. Development of the optical conductivity with doping in single-domain YBa2Cu3O6+x. Phys Rev B Condens Matter 1992; 45:2549-2552. [PMID: 10001794 DOI: 10.1103/physrevb.45.2549] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kotz AL, Klein MV, Lee WC, Giapintzakis J, Ginsberg DM, Veal BW. Anisotropy of the optical dielectric function in the ab plane for YBa2Cu3O7- delta. Phys Rev B Condens Matter 1992; 45:2577-2580. [PMID: 10001801 DOI: 10.1103/physrevb.45.2577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Wake DR, Slakey F, Klein MV, Rice JP, Ginsberg DM. Optically induced metastability in untwinned single-domain YBa2Cu3O7. Phys Rev Lett 1991; 67:3728-3731. [PMID: 10044810 DOI: 10.1103/physrevlett.67.3728] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Delaney ME, McGlinn TC, Klein MV, Morkoç H. Resonant-Raman-scattering study of disorder effects in AlxGa1-xAs alloys. Phys Rev B Condens Matter 1991; 44:8605-8620. [PMID: 9998817 DOI: 10.1103/physrevb.44.8605] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Slakey F, Klein MV, Rice JP, Ginsberg DM. Raman investigation of the YBa2Cu3O7 imaginary response function. Phys Rev B Condens Matter 1991; 43:3764-3767. [PMID: 9997714 DOI: 10.1103/physrevb.43.3764] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
Sixteen patients with vascular lesions of the vertebral and basilar arteries were studied with magnetic resonance imaging. The vascular abnormalities included seven cases of atherosclerotic disease with partial or complete thrombosis, six aneurysms, two cases of vertebrobasilar dolichoectasia, and one basilar artery dissection. Magnetic resonance effectively demonstrated vascular thrombosis with occlusion as high signal intensity on spin echo (SE) sequences with absence of flow void and no flow enhancement on gradient echo (GRE) images. Nonthrombosed aneurysms exhibited mixed signal intensity on SE images and hyperintensity on GRE images. Intraluminal thrombus also appeared heterogeneous, with variable signal intensity depending on the specific components of hemorrhage present. Correlation of the SE and GRE scans was helpful for distinguishing stasis and turbulent flow from thrombus. Compression of cranial nerves by vascular structures was clearly depicted in both cases of dolichoectasia. Basilar artery dissection was displayed as a focal area of flow void surrounded by a thrombosed false lumen. Magnetic resonance is an effective noninvasive method for evaluating vascular pathology of the vertebrobasilar system.
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Slakey F, Klein MV, Rice JP, Ginsberg DM. Behavior of the Raman continuum and Raman "gap" in Tc=60 K YBa2Cu3O7- delta. Phys Rev B Condens Matter 1990; 42:2643-2646. [PMID: 9995739 DOI: 10.1103/physrevb.42.2643] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Schwaighofer BW, Tanaka TT, Klein MV, Sartoris DJ, Resnick D. MR imaging of the temporomandibular joint: a cadaver study of the value of coronal images. AJR Am J Roentgenol 1990; 154:1245-9. [PMID: 2110737 DOI: 10.2214/ajr.154.6.2110737] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Recent studies comparing cryosectional anatomy of the temporomandibular joint (TMJ) to its MR appearance have shown that the assessment of disk displacement is inaccurate when based on the sagittal plane alone. This article describes the MR appearance of the normal and abnormal (positional and osseous changes) TMJ in the coronal plane and compares these findings with their cryosectional anatomy. Twenty-two TMJs from unselected frozen cadavers were embedded in paraffin. Coronal and sagittal MR imaging was performed; specimens were then cut in the same plane as the coronal images. Disk position by cryosection was normal in 14 cases and abnormal in eight cases. Coronal MR images alone correctly depicted the TMJ disk position in 17 cases (77%) (13 normal, four abnormal). Complementary sagittal images were necessary for diagnosing anterior displacement in two cases (9%). MR was inaccurate in three cases (14%) of severe degenerative joint disease. Bone condition was correctly diagnosed on the basis of coronal images alone in all cases. Our study shows that coronal MR imaging alone of the TMJ in cadavers accurately shows disk position in 77% of cases. Complementary sagittal images were of benefit in the diagnosis of an additional 9% with anterior displacement. Disk position was assessed inaccurately in either plane in patients with severe degenerative joint disease. For a full MR assessment of the TMJ for disk position and bone condition, we recommend imaging in both coronal and sagittal planes.
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Affiliation(s)
- B W Schwaighofer
- Department of Radiology, University of California, San Diego Medical Center 92103-1990
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Slakey F, Klein MV, Bukowski ED, Ginsberg DM. Raman properties intrinsic to superconductivity in the Bi-Sr-Ca-Cu-O system. Phys Rev B Condens Matter 1990; 41:2109-2112. [PMID: 9993942 DOI: 10.1103/physrevb.41.2109] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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47
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Abstract
A rare case of primary intracranial myxoma of the posterior fossa is described in a 32-year old woman. The patient presented with a history of headaches, disequilibrium, nausea and abnormal vision for several months. Computed tomography (CT) showed a well-demarcated hypodense mass. After contrast administration the mass appeared as an inhomogeneously enhancing lesion surrounded by a small rim of edema. The mass was surgically excised with histological examination revealing a true myxoma. Echocardiography revealed no evidence of a cardiac myxoma. The CT appearance of other case reports of non-cardiac myxomas in the literature is reviewed.
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Affiliation(s)
- M V Klein
- Department of Radiology, University of California, San Diego
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48
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Abstract
A retrospective analysis of intracranial magnetic resonance (MR scans of 514 patients who underwent nonselective Gd-DTPA enhanced MR imaging was performed to determine the efficacy of this protocol for Gd-DTPA administration. This report reviews the frequency and clinical significance of abnormally enhancing areas that were entirely undetectable on precontrast images or would have been missed without the retrospective knowledge of enhancement. Fifty-seven patients (11% of the 514 patients studied) showed enhancing lesions, with 16 (3.1% of the total) of these patients demonstrating one or more lesions identifiable only on postcontrast images. Of those 16 patients, 8 had other focal abnormalities on precontrast studies, whereas the remaining 8 (1.6% of the total) had negative precontrast studies. The new diagnoses affected clinical management directly in five patients and in another nine contributed potentially significant information. Considerations regarding a selective versus nonselective protocol for Gd-DTPA administration for intracranial MR imaging and the use of clinical information to augment these protocols are discussed.
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Affiliation(s)
- B W Schwaighofer
- Department of Radiology and Magnetic Resonance Institute, University of California, San Diego
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Abstract
A soft tissue mass was found by CT in the mesotympanum of the left middle ear of a 4-year-old boy. This lesion was without radiologic or surgical evidence of associated bony defect or communication with the intracranial cavity. Pathological examination revealed heterotopic brain tissue. Although heterotopic brain tissue in the middle ear is rare, it should be considered in the differential diagnosis of soft tissue middle ear masses.
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Affiliation(s)
- M V Klein
- Department of Radiology, University of California, San Diego
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Reeves ME, Stupp SE, Friedmann TA, Slakey F, Ginsberg DM, Klein MV. Field-dependent specific heat of polycrystalline YBa2Cu3O7-x. Phys Rev B Condens Matter 1989; 40:4573-4584. [PMID: 9992450 DOI: 10.1103/physrevb.40.4573] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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