Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Influence of the transport current on the magnetoelectric properties of La0.7Pb0.3MnO3 single crystals with giant magnetoresistance in the microwave region (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1842-1849 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of experiment on the influence of a direct current and a low-frequency alternating current, as well as a magnetic field, on the microwave-range conductivity σ MW of Ln0.7Pb0.3MnO3 single crystals with giant magnetoresistance are presented. The greatest sensitivity of the samples toward the effects of a current is observed in the temperature range corresponding to the dc magnetoresistance maximum. The response signal of a sample in the microwave range to the effects of an alternating current of a low frequency f 0 has a nonlinear character. As f 0 is varied in a magnetic field, the amplitude of the response signal varies with the appearance of resonance peaks. The results obtained are interpreted within an approach based on the coexistence of two phases having different conductivities in the doped manganite crystals. This two-phase interpretation is supported by data from magneticresonance investigations, which demonstrate the existence of two magnetic phases over a broad temperature range in Ln0.7Pb0.3MnO3 single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and magnetic properties of Cu3B2O6 single crystals (1999)
    Springer
    Physics of the solid state 41 (1999), S. 610-612 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the magnetic susceptibility of Cu3B2O6 single crystals grown by spontaneous crystallization from a melt consisting of a mixture of CuO and B2O3 and the behavior of their magnetization are investigated in magnetic fields up to 55 kOe. A broad susceptibility maximum is observed near 39 K, and a sharp drop in susceptibility is observed at T〈10 K. The paramagnetic Néel temperatures for all orientations of the magnetic field in the crystal investigated are negative, attesting to the predominantly antiferromagnetic character of the exchange interactions. The effective magnetic moment of the Cu2+ ion is anisotropic and lies in the range from 1.054μ B to 1.545μ B. The magnetization depends linearly on magnetic field at T〉10 K, whereas at temperatures below 10 K a discontinuity is observed at fields of the order of 40 kOe. At room temperature, electron magnetic resonance characterized by an almost isotropic g factor (g=2.165) is detected at 36.22 GHz. The exchange interactions in Cu3B2O6 are analyzed on the basis of the Goodenough-Kanamori rules. The possibility of the establishment of a singlet magnetic state in the crystal is analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130835
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetostriction of the spin-Peierls magnet CuGeO3 (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1520-1522 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the longitudinal magnetostriction of a CuGeO3 single crystal is measured within the temperature range 4.2–20 K in a magnetic field of 10 T. As the temperature is raised above 4.2 K, the magnetostriction at first increases from vanishingly small values, attains a maximum at a temperature of approximately 12 K, and then abruptly drops as the temperature approaches the spin-Peierls transition. The results are interpreted on the basis of a simple model utilizing the real pattern of magnetic excitations in the spin system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130590
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Antiferromagnetic resonance in CuB2O4 single crystal (2000)
    Springer
    Physics of the solid state 42 (2000), S. 96-102 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The frequency-field, temperature, and angular dependences of the antiferromagnetic resonance parameters for the tetragonal CuB2O4 single crystal are studied in the frequency range 2.6–80 GHz and at temperatures of 4.2–30 K. The results obtained confirm the fact that, in the high-temperature state in the range 10–21 K, this compound is an easy-plane weak ferromagnet. The temperature dependence of the Dzyaloshinski field is determined. An abrupt change observed in the frequency-field dependence of the magnetic resonance at T=4.2 K and H ⊥ C 4 indicates the transition to the weak ferromagnetic state induced by the external field H ⊥. The phase diagram for CuB2O4 is constructed on the H ⊥-T coordinates. It is demonstrated that, in the low-temperature state, the magnetic moments of copper ions remain in the basal plane, but the weak ferromagnetism is absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131174
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Magnetic susceptibility and magnetic-field behavior of CuB2O4 copper metaborate (2000)
    Springer
    Physics of the solid state 42 (2000), S. 321-325 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental study is reported regarding the temperature dependence of the magnetic susceptibility of a CuB2O4 tetragonal single crystal within the 4.2–200-K range. It has been established that the magnetic susceptibility exhibits anomalies at 21 and 10 K and depends strongly on crystal orientation in the magnetic field. A study has been carried out of the field dependences of the magnetization of CuB2O4 at various temperatures and crystal orientations. It is shown that for T〉21 K, the crystal is in a paramagnetic state determined by Cu2+ copper ions with an effective magnetic moment of 1.77 µB. Within the 10–21 K interval, the field dependence of the magnetization is typical of a weak ferromagnet with magnetic moments of the two antiferromagnetically coupled sublattices lying in the tetragonal plane of the crystal. The spontaneous weakly-ferromagnetic moment is 0.56 emu/g at 10 K. The canting angle of the sublattice magnetic moments, determined by the Dzyaloshinski-Moriya interaction, is 0.49°. It is believed that below 10 K, the CuB2O4 crystal retains its easy-plane magnetic structure, but with a zero spontaneous magnetic moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131205
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Orbital ordering in CuGeO3 (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1534-1539 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The combined effect of the ligand crystal field and the exchange interaction on the Cu2+ cation in CuGeO3 is examined. It is shown that, if the magnitude of the exchange interaction exceeds the splitting of the energy levels of the $$d_{x^2 - y^2 } $$ and d xy orbitals, then an alternate filling of the d orbitals along a chain (orbital ordering) is possible. This effect creates an antiferromagnetic interaction between Cu2+ pairs in 90° exchange and a doubling of the lattice period. A Jahn-Teller pseudoeffect causes singletization of the ground state of the antiferromagnetic chain of Cu2+ spins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130602
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Electrical properties of chromium films (1999)
    Springer
    Physics of the solid state 41 (1999), S. 341-343 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated experimentally the influence of a constant electric current on the magnitude and temperature dependence of the resistance of chromium films prepared by vacuumthermal condensation. The results are interpreted in terms of the Fröhlich conductivity model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130779
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Weak ferromagnetism in copper metaborate CuB2O4 (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1157-1161 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CuB2O4 single crystals have been grown and their magnetic and resonance properties have been investigated for the first time. The temperature dependence of the susceptibility was found to contain features at T=21 and 10 K. The CuB2O4 single crystal transformed at T=21 K to a weakly ferromagnetic state. The sharp drop in susceptibility at T〈10 K is caused by a transition of the magnetic system of CuB2O4 to an antiferromagnetic state. The effective magnetic moment of the Cu2+ ion, determined from the high-temperature part of the magnetic susceptibility, is 1.77 µ B. The room-temperature g factors are, respectively, 2.170 and 2.133 for magnetic field parallel and perpendicular to the c axis of the crystal. The antiferromagnetic resonance parameters in the weakly ferromagnetic and antiferromagnetic phases were measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130957
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Colossal magnetoresistance of FexMn1−xS magnetic semiconductors (1999)
    Springer
    JETP letters 69 (1999), S. 949-953 
    Details
    ISSN: 1090-6487
    Keywords: 75.30.Vn ; 75.50.Pp ; 72.80.Ga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic, electric, magnetoresistive, and structural properties are investigated in the sulfide solid solutions FexMn1−2x S, which are based on the antiferromagnetic semiconductor α-MnS (the fcc NaCl lattice). Colossal negative magnetoresistance (δH∼−83% at 160 K for x ∼ 0.29), comparable to that observed in La-Ca-Mn-O polycrystals and films (δH∼−90% at 100 K and 40 kOe), is observed in compounds with intermediate concentrations 0.26〈x〈0.4, corresponding to the region of incipient ferromagnetism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568118
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and magnetic properties of copper metaborate single crystals, CuB2O4 (2000)
    Springer
    Crystallography reports 45 (2000), S. 853-856 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Large high-quality single crystals of copper metaborate are grown on the basis of the phase diagram of the ternary Li2O-CuO-B2O3 system. Bright blue crystals with a volume of about 1 cm3 were grown by the method of spontaneous crystallization while slowly cooling the melt. The magnetic susceptibility and electron spin resonance were measured. It is shown that the effective magnetic moment of a Cu2+ ion is equal to 1.6 μB and the g-factor, to 2.170 and 2.133 for the magnetic field oriented parallel and perpendicular to the fourfold axis, respectively. At 21 and 10 K, sharp anomalies of magnetic susceptibility are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1312935
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...