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Correlation between Mn and Ru valence states and magnetic phases inSrMn1−xRuxO3
Kim, D. H.,Lee, Eunsook,Kim, Hyun Woo,Kolesnik, S.,Dabrowski, B.,Kang, Chang-Jong,Kim, Minjae,Min, B. I.,Lee, Han-Koo,Kim, J.-Y.,Kang, J.-S. American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.91 No.7
Valence and spin states, and the metal-insulator transition in ferromagneticLa2−xSrxMnNiO6(x=0,0.2)
Kang, J.-S.,Lee, H. J.,Kim, D. H.,Kolesnik, S.,Dabrowski, B.,Ś,wierczek, K.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Physical Society 2009 Physical review. B, Condensed matter and materials Vol.80 No.4
Soft x-ray absorption spectroscopy study of Mo-rich SrMn1−xMoxO3(x⩾0.5)
Hwang, J. H.,Kim, D. H.,Kang, J.-S.,Kolesnik, S.,Chmaissem, O.,Mais, J.,Dabrowski, B.,Baik, J.,Shin, H. J.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Physical Society 2011 Physical review. B, Condensed matter and materials Vol.83 No.7
Increase of YBa2Cu3O7 critical currents by Mo substitution and high-pressure oxygen annealing
Los A.,Dabrowski B.,Rogacki K. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
We have previously shown for powders that Mo substitution into the CuO chains of YBa2Cu3O7 can create effective pinning centres which significantly increase the critical current density (jc) in 7 T field by a factor of 4 and 10 at 50 and 60 K, respectively (Rogacki et al., 2006) [1]. The present work reports on the influence of the Mo substitution and high-pressure oxygen annealing on the pinning properties and critical currents of YBa2Cu3- xMoxO7-d by comparing pure (x = 0, d > 0) and substituted (x = 0.03, d < 0) single crystals. Pinning properties have been investigated by measurements of magnetization loops and calculations of jc in the ab-plane, in the temperature range from 2 to 90 K and in fields up to 14 T. Depending on the Mo substitution and the oxygen treatment, several types of pinning centres increasing jc have been revealed and analysed in the frame of Dew- Hughes’ and Kramer’s models.
Kang, J.-S.,Kim, G.,Lee, H. J.,Kolesnik, S.,Dabrowski, B.,Lee, Hangil,Kim, J.-Y.,Lee, Jieun,Kim, Bongjae,Min, B. I. American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>The electronic structure of ferromagnetic double-perovskite La2MnNiO6 has been investigated by employing Mn and Ni 2p -> 3d resonant photoemission spectroscopy (RPES) and soft x-ray absorption spectroscopy (XAS). The Mn and Ni 2p XAS measurements show that Mn ions are formally tetravalent (3d(3)) and that Ni ions are formally divalent (3d(8)). Mn and Ni 2p -> 3d RPES shows that the occupied Mn 3d(3) (t(2g)(3)up arrow) states are sharp and located around 2 eV below E-F, while the occupied Ni 3d(8) (t(2g)(3)up arrow t(2g)(3)up arrow e(g)(2)up arrow) states are broader than the Mn 3d states and they extend from E-F to similar to 5 eV below E-F. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073663]</P>