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  • 1
    Electronic Resource
    Electronic Resource
    Electron-lattice coupling in "colossal" magnetoresistance rare earth manganites : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5502-5503 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results reported in this conference have been published elsewhere. This article presents a brief precis of the published work, along with a few additional remarks. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364581
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  • 2
    Electronic Resource
    Electronic Resource
    Slave boson large degeneracy expansion for the lattice Anderson model (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3904-3908 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The slave boson formalism will be reviewed, a comparison of Kondo spin compensation in the impurity and in the lattice will be given, results for the temperature- and frequency-dependent conductivity will be presented, the density-density correlation function will be discussed, and a calculation of the slave-boson mediated d-wave superconducting instability will be outlined. Throughout, we emphasize the differences between the lattice and one impurity Anderson models and the strengths and weaknesses of the slave boson method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338578
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  • 3
    Electronic Resource
    Electronic Resource
    Proximity-Josephson effect (PJE) evidence for triplet pairing in UBe13 (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3899-3903 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The proximity-Josephson effect (PJE) is a powerful general method of determining the symmetry of the pair wave function in exotic superconductors. The method is simple and relatively insensitive to the surface condition of the sample. A superconducting probe (S) of known pairing symmetry (typically Nb or Ta) is brought into contact with the sample (N). Observations and arguments based on the de Gennes boundary condition at the NS interface both indicate formation of a local, proximity-induced superconducting region of depth ξ in the sample (N) under the probe. The induced pairs have the same symmetry as those of S. The expected pair-phase dependence of the coupling energy between the pairs in N and S leads to a Josephson current Ic(T), which may be observed up to a junction critical temperature T* which is typically ∼0.8 of the Tc of S. When the measurement temperature falls below the bulk Tc of N (the exotic superconductor), a pair wave function of possibly different symmetry forms in the bulk of N and overlaps the induced pair wave function near the probe. Weak interactions between the induced and bulk pairs occur. In the case of UBe13 contacted with a Ta tip, the interaction weakly suppresses the induced pairs [which determine Ic(T)] leading to a reduction of the Josephson current at T〈Tc. This observation of a negative S-wave proximity effect in superconducting UBe13, in good agreement with a Ginzburg–Landau analysis, is strong evidence for triplet pairing in this heavy fermion compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338577
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  • 4
    Electronic Resource
    Electronic Resource
    Optical and magnetic property of LaMnO3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5013-5015 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A tight binding parameterization of the band structure, along with a mean field treatment of Hund, electron–electron, and electron–lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict the magnetic phase transition causes striking changes in the functional form and magnitude of the optical absorption. Our results differ from those obtained by the local density-functional approximation techniques. Possible origins of the discrepancy are discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373232
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  • 5
    Electronic Resource
    Electronic Resource
    Critical behavior in the two-impurity Kondo problem (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5221-5221 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The antiferromagnetic two-impurity Kondo problem, involving two magnetic moments coupled antiferromagnetically to each other and also to a band of itinerant electrons, has been found to exhibit nontrivial behavior.1 We show analytically2 that the presence of a type of particle-hole symmetry guarantees a nonanalyticity in the ground-state energy as the antiferromagnetic RKKY coupling is varied relative to the Kondo temperature. This symmetry is not present in the generic antiferromagnetic two-impurity model. Previous work on the symmetric model1 has shown that the nonanalyticity is a second-order T=0 phase transition with diverging specific heat coefficient and staggered susceptibility. We have studied the effect of breaking the symmetry via an analytic large-N expansion and via Wilson's numerical renormalization group technique. The analytic work suggests that there may be no transition if the symmetry is broken. The preliminary numerical work suggests either that the transition survives, or that there is a well-defined crossover signalled by an order of magnitude or more enhancement of the specific heat coefficient. Further analytic and numerical work is in progress to resolve the dilemma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344616
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  • 6
    Electronic Resource
    Electronic Resource
    Quantifying strain dependence in "colossal" magnetoresistance manganites (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1588-1591 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental, phenomenological, and theoretical analyses are given of the dependence on strain of the ferromagnetic Tc of the colossal magnetoresistance (CMR) rare earth manganese perovskites. It is found that Tc is extremely sensitive to biaxial strain; by implication other physical properties are also. The results indicate that biaxial strain is an important variable which must be considered in the design of devices based on thin films and provide evidence in favor of the relevance of the Jahn–Teller electron-phonon coupling to the CMR phenomenon. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367310
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  • 7
    Electronic Resource
    Electronic Resource
    Salk and science (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 473-473 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Renato Dulbecco's otherwise excellent obituary of Jonas Salk (Nature 376, 216; 1995) is marred by its conclusion. Dulbecco writes that Salk "...received no recognition from the scientific world.... The reason is that he did not make any innovative scientific discovery. The fact that a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377473e0
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  • 8
    Electronic Resource
    Electronic Resource
    High-temperature superconductivity Research enters a new phase (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 193-194 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] “The only difference between the rich and other people is that the rich have more money”, Molly Colum once remarked to Ernest Hemingway. Is the only difference between cuprate (copper-oxide) superconductors and conventional materials the high value of the superconducting transition ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/18311
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  • 9
    Electronic Resource
    Electronic Resource
    Condensed-matter physics Stripes of a different stripe (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 438-439 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In some materials, the electronic charge density organizes itself into stripes. Stripe physics has been of intense interest to condensed-matter physicists, as an example of a non-trivial ordering phenomenon, and because of its possible connection to high-temperature superconductivity. On page ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/33017
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  • 10
    Electronic Resource
    Electronic Resource
    Lattice effects in magnetoresistive manganese perovskites (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 147-150 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The discovery of spectacularly large magnetoresistive responses in a class of metallic manganese oxides has raised hopes that these compounds might be of practical utility. But regardless of whether this promise is realized, these materials provide an ideal system in which to elucidate the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/32348
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