Correlated Oxides II

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Santa Barbara, August 9-10, 2010 I. A road to a room-temperature superconductor <strong>II</strong>. Frustration and Cu minerals <strong>II</strong>I. Rattling good material: β-pyrochlore oxides
! Introduction to superconductivity ! Copper oxide superconductors: Preparation and Materials ! Mechanism of the superconductivity ! What determines the T c ? ! Future prospect
Page 1: Santa Barbara, August 10, 2010 Zen
Page 5: Why, Cu-O? Oxygen 2p holes moving i
Page 10: 1996
Page 13 and 14: Iron Age LnFeAsO T c = 54 K O/F
Page 15 and 16: What determines the T c ? Supercond
Page 17 and 18: Where is a roomtemperature supercon
Page 19 and 20: Applications of SC If there is a
Page 21: Materials H. Yoshida, Y. Okamoto (I
Page 26 and 27: Two states are degenerate with the
Page 28 and 29: How to release the entropy at LT? T
Page 30 and 31: in the kagome lattice cf. Review f
Page 32 and 33: Short-range RVB T or E large ξ
Page 34 and 35: ND diffraction by S.-H. Lee & A. Ha
Page 36 and 37: Named after Alexander von Volborth
Page 38 and 39: 0.07% 0.5% by annealing in hydrothe
Page 40 and 41: These features have appeared in a c
Page 42 and 43: H s3 0.19J av 0.19J av H s2 H s1
Page 44 and 45: Special thanks to the Kawamura toku
Page 46 and 47: Cage Rattler rattler = “gala gala
Page 49 and 50: Figure of Merit “Phonon glass, el
Page 51 and 52: Si/Ge/Ga clathrates A 2 B 6 X 46 fi
Page 53 and 54:
• Large space in a cage • Weak
Page 55 and 56:
Calculated potential for the A cati
Page 57 and 58:
quartz tube AgO 450~550 for 48 h KO
Page 59 and 60:
β-AOs 2 O 6 K 9.6 K Cs Re 1.0 K Cs
Page 61 and 62:
T p = 7.6 K T c KOs-729 1.302 mg Δ
Page 63 and 64:
ND Lattice expands by Δa ~ 0.01% A
Page 65 and 66:
cf. Isomorphous Isostructural Equis
Page 67 and 68:
Metallic cage Ionic rattler Rattlin
Page 69 and 70:
There are many interesting material
Page 72 and 73:
Neutron “powder” diffraction ex
Page 74 and 75:
Change in the dynamics of the rattl
Page 76 and 77:
No sharp transition for degraded cr
Page 78 and 79:
K Rattler Einstein modes Cage Debye
Page 80 and 81:
Cs Rb K @ 300 K T 1u T 2g T 2g T 1u
Page 82 and 83:
AF! ?! ?! Localized electrons! nn A
Page 85 and 86:
χ exhibits commonly • Broad peak
Page 87 and 88:
- + - + - Most probable LRO or a sp
Page 89 and 90:
Named after Alexander von Volborth
Page 91 and 92:
1D Heisenberg chains Material meet
Page 93 and 94:
Spin ladders can emerge from the 2D
Page 95:
V ion electron • U • U/W h
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Correlated Oxides II

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