Materials 286K Class 14, 4d and 5d Going from 3d to 4d, we expect broader bands, and for 5d, relativistic effects. The changes in.

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Presentation transcript:

Materials 286K Class 14, 4d and 5d Going from 3d to 4d, we expect broader bands, and for 5d, relativistic effects. The changes in the radial distribution function correspond to scalar relativistic effects. In addition, for heavier elements (usually beyond La), spin-orbit coupling (also referred to as “fully relativistic” effects mix up quantum numbers.

Materials 286K Class 14, 4d and 5d: SrTcO 3 SrTcO3 has the highest magnetic ordering temperature of any perovskite oxide, and the highest ordering temperature of any non 3d compound. Rodriguez, Poineau, Llobet, Kennedy, Avdeev, Thorogood, Carter, Seshadri, Singh, Cheetham, Phys. Rev. Lett. 106 (2011) (1–4).

Materials 286K Class 14, 4d and 5d: SrTcO 3 High ordering temperatures arise because of very high covalency and hence strong superexchange. Rodriguez, Poineau, Llobet, Kennedy, Avdeev, Thorogood, Carter, Seshadri, Singh, Cheetham, Phys. Rev. Lett. 106 (2011) (1–4).

Materials 286K Class 14, 4d and 5d: PdAs 2 O 6 PdAs 2 O 6 has a significantly higher Neel temperature (140 K) than NiAs 2 O 6 (30 K). Reehuis, Saha-Dasgupta, Orosel, Nuss, Rahaman, Keimer, Andersen, Jansen, Phys. Rev. B. 85 (2012) (1–4).

Materials 286K Class 14, 4d and 5d: PdAs 2 O 6 PdAs 2 O 6 has a significantly higher Neel temperature (140 K) than NiAs 2 O 6 (30 K). Dashed red is Pd and solid back in Ni. Reehuis, Saha-Dasgupta, Orosel, Nuss, Rahaman, Keimer, Andersen, Jansen, Phys. Rev. B. 85 (2012) (1–4).

Materials 286K Class 14, 4d and 5d: Ruthenates: SrRuO 3 SrRuO 3 is a metallic ferromagnet. In this example, substitution of Sr by La and Ru by Rh results in the magnetism (and metallicity) being suppressed. Barton, Seshadri, Rosseinsky, Phys. Rev. B. 83 (2011) (1–8).

Materials 286K Class 14, 4d and 5d: Ruthenates: SrRuO 3 The nature of the magnetism from the Rhodes-Wolfarth ratio. SrRuO 3 is neither perfectly localized not perfectly itinerant. Barton, Seshadri, Rosseinsky, Phys. Rev. B. 83 (2011) (1–8).

Materials 286K Class 14, 4d and 5d: Ruthenates: SrRuO 3 Metallic behavior and magnetism can be killed by tilting. Longo, Raccah, Goodenough, J. Appl. Phys. 39 (1968) 1327–1328.

Materials 286K Class 14, 4d and 5d: Ruthenates: Sr 2 RuO 4 is a superconductor Sr 2 RuO 4 is a superconductor below 2 K Mackenzie, Maeno, Rev. Mod. Phys. 75 (2003) 657– 712.

Materials 286K Class 14, 4d and 5d: Ruthenates: Sr 2 RuO 4 is a superconductor Unconventional superconductor with d-wave pairing. Mackenzie, Maeno, Rev. Mod. Phys. 75 (2003) 657– 712.

Materials 286K Class 14, 4d and 5d: Iridates. Rh 3+ vs. Ir 4+. The structures of Ir and Rh oxides, including (a) rutile MO 2, (b) corundum M 2 O 3 and (c) the orthorhombic Pbna M 2 O 3. Miao, Seshadri, J. Phys. Condens. Matter 24 (2012) (1–8).

Materials 286K Class 14, 4d and 5d: Iridates. Rh 3+ vs. Ir 4+. Energy levels with and without relativistic effects.. Miao, Seshadri, J. Phys. Condens. Matter 24 (2012) (1–8).

Materials 286K Class 14, 4d and 5d: Iridates. Rh 3+ vs. Ir 4+. Relativistic effects give the preference for IrO 2 over Rh 2 O 3. Miao, Seshadri, J. Phys. Condens. Matter 24 (2012) (1–8).

Materials 286K Class 14, 4d and 5d: Iridates. Rh 3+ vs. Ir 4+. DOS: Miao, Seshadri, J. Phys. Condens. Matter 24 (2012) (1–8).

Materials 286K Class 14, 4d and 5d: Sr 2 IrO 4 “Despite delocalized Ir 5d states, the J eff states form such narrow bands that even a small correlation energy leads to the J eff = 1/2 Mott ground state with unique electronic and magnetic behaviors, suggesting a new class of J eff quantum spin driven correlated-electron phenomena.” Kim, Jin, Moon, Kim, Park, Leem, Yu, Noh, Kim, Oh, Park, Durairaj, Cao, Rotenberg, Phys. Rev. Lett. 101 (2008) (1–4).

Materials 286K Class 14, 4d and 5d: Sr 2 IrO 4 LDA + SO + U appears to provide the correct description of the electronic structure. Kim, Jin, Moon, Kim, Park, Leem, Yu, Noh, Kim, Oh, Park, Durairaj, Cao, Rotenberg, Phys. Rev. Lett. 101 (2008) (1–4).

Materials 286K Class 14, 4d and 5d: Sr 2 IrO 4 Resonant X-ray scattering appears to support the idea of the spin-orbit-Mott state. Kim, Ohsumi, Komesu, Sakai, Morita, Takagi, Arima, Science 323 (2009) 1329–1332.

Materials 286K Class 14, 4d and 5d: Spin-Orbit-Mott phases Resonant X-ray scattering apears to support the idea of the spin-orbit-Mott state. Pesin, Balents, Nature Phys. 6 (2010) 376–381.