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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of protons and cations in sodium H-Y zeolites (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 3856-3859 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150625a029
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic phase diagram of the charge ordered manganite Pr0.8Na0.2MnO3 (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7413-7415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pr1−xNaxMnO3 solid solutions up to x=0.25 were prepared. Irrespective of magnetic order all samples are electrically insulating. The Curie temperature is maximum at TC=125 K for x=0.15; the samples with x≥0.2 are charge-ordered antiferromagnets. The x=0.2 antiferromagnetic charge-ordered insulator (AFCO) can be switched to the ferromagnetic metallic state (FMM) by application of a relatively weak external magnetic field. This is accompanied by a huge CMR effect, irreversible at low temperatures. The neutron diffraction data, which show a decoupling of charge order (TCO=215 K) and long range AF order of the "pseudo" CE (TN=175 K), are supported by specific heat measurement. The specific heat at 14 T confirmed the transformation of the x=0.2 sample to FMM state and the nature of the AFCO–FMM transition was probed by magnetic moment and electrical resistivity relaxation measurements. This comprehensive characterization of the sample led to a complete determination of the magnetic phase diagram which demonstrated the near degeneracy of the ferro- and antiferromagnetic ground states in Pr0.8Na0.2MnO3. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358345
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic ground states in Pr1−xSrxMnO3 (x=0.48−0.75) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7404-7406 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electric transport properties of single-crystal and ceramic samples of Pr1−xSrxMnO3 perovskites were investigated and correlated with structural and magnetic data. Analysis of the experimental data leads to the following conclusions: (i) the phase boundary between the ferromagnetic and A-type antiferromagnetic ground states is observed at x=0.49, (ii) the A-type systems are polaronic conductors in two dimensions, i.e., in the ferromagnetic planes, and approach the metallic conductivity with increasing x, (iii) an appreciable CMR effect in medium fields is observed for x∼0.50 due to the field-induced ferromagnetic transition, (iv) the A type–C type phase boundary occurs for x∼0.60, and, finally, (v) the charge carrier transport in the C-type antiferromagnets is reliably characterized by variable range hopping in one dimension i.e., along the ferromagnetic chains. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358342
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  • 4
    Electronic Resource
    Electronic Resource
    Canted structures in the Mn3+/Mn4+ perovskites : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5790-5792 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction and magnetization measurements have been performed on numerous systems with the divalent and monovalent substitution, Pr1−xAx2+Mn1−x3+Mnx4+O3 (A=Ca, Sr, Ba) and Pr1−x/2Ax/2+Mn1−x3+Mnx4+O3 (A=Na, K). The study shows that the transition from the Ay-type (layer) antiferromagnetism in pure PrMnO3 to the ferromagnetism in the mixed-valence systems is not continuous. In a range of about 5%–15% of Mn4+ (x∼0.05–0.15), canted magnetic arrangements of the AyFz type are observed. The interlayer coupling is changed gradually from θ=180° for x=0–0.05 to θ∼90° for x=0.15. For about x=0.15–0.20, the canted phase with 90° coupling coexists with a purely ferromagnetic arrangement of the Fy type. The observed behavior is related to an interplay of the magnetic superexchange and the double exchange. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364669
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal anomalies and the insulator–metal (I–M) transition in Mn3+/Mn4+ perovskites : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4975-4976 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a comparative study of two ferromagnets—Pr0.7Sr0.1Ca0.2MnO3 and Pr0.85K0.15MnO3— which exhibit the same formal Mn valency, similar Tc and saturated moments at 5 K. While for former sample the magnetic transition is accompanied by the insulator–metal transition at T∼Tc , the insulator–metal (I–M) transition is not observed in the latter one despite the expectation based on the Goldschmidt's tolerance factor. The first order character of the I–M transition in Pr0.7Sr0.1Ca0.2MnO3 is demonstrated by a discontinuity of the unit cell volume, step of the specific heat and huge enhancement of the thermal conductivity. The lack of these anomalies in Pr0.85K0.15MnO3 suggests that the properties of perovskite manganites are critically influenced by both a strong phonon–electron coupling arising from a Jahn–Teller splitting of eg orbitals of the Mn3+ ion and the local lattice effects due to size mismatch of the large cations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364880
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal conductivity and magnetic transitions in Mn3+/Mn4+ manganites : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7204-7206 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on a comparative study of three manganites: Pr0.5Sr0.5MnO3, Pr0.5Ca0.5MnO3, and Pr0.5Sr0.3Ca0.2MnO3, which all exhibit the same Mn3+/Mn4+=1:1 concentration but show a very distinct magnetic behavior. The Pr0.5Sr0.5MnO3 sample is a ferromagnet (FM) below TC=265 K and becomes the A-type antiferromagnet at TN=140 K. In Pr0.5Ca0.5MnO3 the charge order develops at TCO=245 K and the CE-type antiferromagnetism occurs below TN=175 K. The Pr0.5Sr0.3Ca0.2MnO3 sample exhibits the FM transition at TC=225 K and the CE type antiferromagnetism and charge ordering occur simultaneously at TN=TCO=160 K (185 K) upon cooling (heating), respectively. The study is complemented by the data on two systems of 30% Mn4+, the ferromagnetic metal Pr0.7Sr0.1Ca0.2MnO3, and insulator Pr0.85K0.15MnO3, both with similar Curie temperature TC∼140 K. The electrical resistivity, thermoelectric power, thermal conductivity, and volume thermal expansion data are analyzed with respect to observed magnetic transitions and reveal the significantly distinct ground state of the A-type and CE-type antiferromagnets. We suppose that phonons and charge carriers are coupled via the Jahn–Teller effect and the CMR effect observed in manganites originates thus from a mutual interplay of a strong electron–phonon interaction and spin order. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367677
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic and Moessbauer resonance investigations of the weak ferrimagnet iron molybdate (Fe2(MoO4)3) (1982)
    s.l. : American Chemical Society
    Inorganic chemistry 21 (1982), S. 4218-4223 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00142a021
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  • 8
    Electronic Resource
    Electronic Resource
    Superconductivity, magnetism, and the charge transfer in Y0.8Ca0.2Ba2Cu3Oy (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4230-4230 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly dense ceramic samples of Y0.8Ca0.2Ba2Cu3Oy (y=6.03–6.89) have been characterized by the x-ray and neutron diffraction and investigated using the resistivity, thermoelectric power, Hall effect, and magnetic susceptibility measurements. The study showed a correlation between the occurrence of superconductivity, the structural data, and the magnetic and transport properties in the normal state. Three distinct superconducting plateaus depending on the decreasing oxygen content were revealed. First two plateaus with Tc of about 80 (y〉6.75) and 50 K (6.75〉y〉6.50) are associated with the Ortho I and II structures which are characterized with infinite Cu–O chains. The third plateau corresponds to macroscopically tetragonal phase with Tc=25 K (6.50〉y〉6.40) and is possibly associated with the formation of the Cu–O–Cu dimers. All three superconducting phases exhibit sharp magnetic transitions with nearly complete diamagnetism at low temperatures. In the normal state of the superconductors, the metalliclike conductivity is accompanied by a paramagnetism with appreciable Pauli component. The hole concentrations estimated from the calculated bond valence sums for Cu2 ions in the CuO2 planes are in good agreement with a number of itinerant carriers deduced from the Hall data. The behavior of carriers is dramatically changed at the transition to the nonsuperconducting region (y〈6.40). In particular, the Pauli paramagnetism and the Hall number decrease abruptly while the Cu2 bond valence sums continue to change smoothly. A rapid localization of charge carriers below y=6.40 is further indicated by the temperature activation of the resistivity and Hall constant. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365130
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  • 9
    Electronic Resource
    Electronic Resource
    A neutron diffraction study of H, Na-Y zeolites
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 41 (1980), S. 1089-1095 
    Details
    ISSN: 0022-3697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(80)90064-5
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  • 10
    Electronic Resource
    Electronic Resource
    The cooperative Jahn-Teller effect in BaFe"2"."5Mn"9"."5O"1"9
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 183 (1993), S. 96-102 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(93)90059-F
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