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  • 1
    Electronic Resource
    Electronic Resource
    Tilting Mode Relaxation and Oxygen Isotope Effect in La2−xSrxCuO4 Studied by Electron Paramagnetic Resonance (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 955-958 
    Details
    ISSN: 1572-9605
    Keywords: EPR ; LSCD ; isotope effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The electron paramegnetic resonance (EPR) of Mn2+ doped into La2−x Sr x CuO4 was used to probe the copper spin relaxation via the bottleneck effect for oxygen isotope (16O and 18O)–substituted samples. It was found that the EPR linewidth is larger for the 18O isotope samples than for the 16O samples. For x = 0.03, the linewidth for the 18O sample is larger than for 16O sample by a factor of 2. The isotope effect is pronounced at low temperatures and decreases with increasing Sr concentration. This effect is quantitatively explained by the Cu2+ S = 1/2 spin relaxation to the lattice via Dzyaloshinski terms coupled linearly to the local Q 4/Q 5 tilting modes of the CuO6 octahedra as proposed by Kochelaev et al. [1] The Q 4/Q 5 modes are coupled sterically to the Q 2 Jahn–Teller modes considered to be relevant for the (bi)-polaron formation and thus for the high-temperature superconductivity (HTSC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026498123890
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  • 2
    Electronic Resource
    Electronic Resource
    Elementary spin excitations in a Heisenberg S=1/2 antiferromagnet with Skyrmions (1997)
    Springer
    Physics of the solid state 39 (1997), S. 574-576 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elementary spin excitations in two-dimensional Heisenberg antiferromagnets with spin S=1/2 in a metastable, spatially inhomogeneous state are investigated. The energy spectrum of the excitations, the local order parameter, and the temperature dependence of the spin correlation length are found. It is shown that the results obtained can be used to explain the experimental data on neutron scattering in La2CuO4 at temperatures T〉T N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129932
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  • 3
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance linewidth in a two-dimensional Heisenberg antiferromagnet (S=1/2) with skyrmeons (2000)
    Springer
    Physics of the solid state 42 (2000), S. 510-513 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron magnetic relaxation was studied in a two-dimensional Heisenberg antiferromagnet (S=1/2) with skyrmeons. The electron paramagnetic resonance (EPR) linewidth (Г⊥) was calculated at temperatures T≤J (J is the nearest-neighbor interaction constant). The magnitude of Г⊥ caused by the Dzyaloshinskii-Moriya interaction is shown to grow as r 0/a with decreasing temperature, whereas the anisotropic symmetric interaction leads to the (r 0/a)3 dependence, where r 0 is the average size of a skyrmeon and a is the lattice parameter. The results obtained agree qualitatively with calculations performed on the basis of a renormalization-group (RG) analysis of the nonlinear σ model at .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131240
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  • 4
    Electronic Resource
    Electronic Resource
    EPR study of polycrystalline superconductors with YBa2Cu3O7 structure (1989)
    Springer
    Journal of low temperature physics 77 (1989), S. 87-118 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron paramagnetic resonance (EPR) of Gd3+, Eu2+, and copper ions has been investigated in the high-Tc superconductor with YBa2Cu3O7−α structure. It has been established that the system is heterogeneous at 0.15≤δ≤0.5 and consists of metallic and dielectric regions. The former arises due to oxygen enrichment while the later due to oxygen deficiency. The integral of exchange interaction between Gd3+ localized moments and conduction electrons Jsf=0.016 eV has been determined from the normal state temperature dependence of Gd3+ EPR linewidth for metallic regions. Tc depression by gadolinium-localized moments for GdBa2Cu3O7−α was estimated to be ΔTc⋍−2K. Anomalies in linewidth temperature dependence upon transition from the normal to the superconducting state have given information about the value and temperature behavior of the superconductor's energy gap. The model, which gives the opportunity to understand some peculiarities of the EPR signal for YBa2Cu3O7−α samples, is proposed in terms of several bottlenecked spinsubsystems: spin-liquid in CuO planes and Cu2+-O− and Cu2+-O2− fragments in CuO chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681880
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  • 5
    Electronic Resource
    Electronic Resource
    Nuclear acoustic resonance involving the nuclei of paramagnetic iron-group ions (1969)
    Springer
    Russian physics journal 12 (1969), S. 483-486 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The resonant absorption of ultrasound by the nuclei of paramagnetic iron-group ions is treated theoretically for the case in which the nuclei interact with the ultrasound by means of a hyperfine quadrupole interaction. The coefficient of resonant ultrasonic is calculated on the basis of this mechanism. The possible observation of acoustic resonance by means of the Mössbauer effect (with the isotope Fe57) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00816037
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  • 6
    Electronic Resource
    Electronic Resource
    Spin-Phonon Interaction and the EPR Linewidth in La2CuO4 and Related Cuprates (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 53-55 
    Details
    ISSN: 1572-9605
    Keywords: 2D QHAF ; spin-phonon interaction ; the EPR linewidth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The spin-phonon interaction is derived for Cu2+ ions stronglycoupled by the isotropic exchange interaction. It is shown that in a two-dimensionalquantum Heisenberg antiferromagnetic this interaction due to its antisymmetricstructure couples the phonon modes near the wave vectors (±π/a, ±π/a)to the staggered magnetization. A contribution of the spin-phonon interactionto the EPR linewidth is calculated and its temperature dependence compared with othersources of the broadening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007765402097
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  • 7
    Electronic Resource
    Electronic Resource
    In Memory of M. A. Teplov (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 323-324 
    Details
    ISSN: 1572-9605
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007745114334
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  • 8
    Electronic Resource
    Electronic Resource
    Spin-lattice oscillations in a paramagnet (1968)
    Springer
    Russian physics journal 11 (1968), S. 1-3 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the elementary excitation spectrum of a system of interacting spins and phonons in a solid. A dispersion law for spinlattice waves has been obtained, and possible methods of studying it experimentally are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820375
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