iron-age superconductors · prb 78, 060505 (2008)! 111! there are a number of different crystal...
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Iron-Age Superconductors
Mike Norman
Materials Science Division Argonne National Laboratory
& Center for Emergent Superconductivity
Physics 1, 21 (2008)
Saas-Fee, Jan. 10, 2011
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JACS 130, 3296 (2008)
1111
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Rotter et al. PRL 101, 107016 (2008)
Hsu et al. PNAS 105, 14262 (2008)
122 11
Tapp et al. PRB 78, 060505 (2008)
111
There are a number of different crystal structures
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The Undoped Material is an Antiferromagnet (just like the cuprates)
de la Cruz et al., Nature 453, 899 (2008)
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Sebastian et al., JPCM 20, 422203 (2008)
But it is a Metal (unlike the cuprates)
quantum oscillations in Sr-122
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Goldman et al., PRB 78, 100506 (2008)
Magnetic and Structural Transitions are Tied Together
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Zhao et al., Nat. Phys. 5, 555 (2009)
Anisotropic Spin Exchange (Ca-122)
Harriger et al., arXiv:1011.3771
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spin flip
linear response
Yildirim, Physica C 469, 425 (2009)
Anisotropic Spin Exchange (theory)
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Nematic Order in 122 (STM & transport)
Chuang et al., Science 327, 181 (2010)
Chu et al., Science 329, 824 (2010)
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Nematic Order in 122 (ARPES)
Yi et al., arXiv:1011.0050
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Takahashi et al., Nature 453, 376 (2008)
Mizuguchi et al., APL 93, 152505 (2008)
Superconductivity can be induced by Doping or Pressure
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Coexistence of superconductivity & magnetism
Drew et al., Nat. Matls. 8, 310 (2009)
Sm-1111
Canfield & Bud’ko, Ann. Rev. Condens. Matter Phys. 1, 27 (2010)
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Similarity of Phase Diagrams
Uemura, Nat. Matls. 8, 253 (2009)
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Phase Diagram - Cuprates in Disguise?
Hess et al., EPL 87, 17005 (2009)
1111
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Quantum Criticality? (K-doped 122)
Gooch et al., PRB 79, 104504 (2009)
ρ-ρ0 ~ Tn
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Yuan et al., Nature 457, 565 (2009)
Weak Anisotropy of Hc2
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T3 NMR relaxation rate
Grafe et al., PRL 101, 047003 (2008)
La-1111
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Checkelsky et al., arXiv:0811.4668
Thermal conductivity similar to cuprates
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Gordon et al., PRB 79, 100506 (2009) Hashimoto et al., PRL 102, 207001 (2009)
Penetration Depth, T2 versus exponential
Co-doped 122 K-doped 122
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Field Dependence of Thermal Conductivity (Co-doped 122)
Tanatar et al., PRL 104, 067002 (2010)
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Field Angular Dependence of Specific Heat (FeSe-Te)
Zeng et al., Nature Comm. 1, 112 (2010)
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No Phase Shift in Corner Junctions
Zhou et al., arXiv:0812.3295
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Chen et al., Nat. Phys. 6, 260 (2010)
Half Flux Quantum Vortices (Nd-1111)
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Quantum Interference in FT-STM (FeSe-Te)
Hanaguri et al., Science 328, 474 (2010)
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Critical current versus grain boundary angle (Co-doped 122)
Lee et al., APL 95, 212505 (2009)
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Moll et al., Nat. Matls. 9, 628 (2010)
Critical current versus magnetic field (F-doped Sm-1111)
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Spin Resonance Mode in Superconducting Phase (K-doped 122)
Christianson et al., Nature 456, 930 (2008)
Δk = -Δk+Q
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Paglione & Greene, Nat. Phys. 6, 645 (2010)
Scaling of Resonance Energy with Gap
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Doping Dependence of Spin Resonance Mode (K doped Ba122)
Castellan et al., unpublished
x=0.3 x=0.5 x=0.7 x=0.9
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Castellan et al., unpublished
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Bao et al., arXiv:1002.1617
Is it a Triplet (FeSe-Te)?
Babkevich et al., arXiv:1010.6204
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Is it a Doublet (Sc=±1)?
Sa=0
Lipscombe et al., PRB 82, 064515 (2010)
Sb=0
Ni-doped Ba122
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Zabolotnyy et al., Nature 457, 569 (2009)
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Ding et al., EPL 83, 47001 (2008)
Energy Gaps from ARPES (K-doped 122)
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Nakayama et al., EPL 85, 67002 (2009)
Energy Gaps from ARPES (K-doped 122)
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Nakayama et al., arXiv:1009.4236
Energy Gaps from ARPES (K-doped 122)
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Sekiba et al., New J Phys 11, 025020 (2009)
ARPES Doping Dependence - Nesting and Tc
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dHvA Doping Dependence - Nesting and Tc
Analytis et al., PRL 105, 207004 (2010)
BaFe2As2
BaFe2P2
BaFe2As2 - shifted
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Mode coupling from ARPES (K-doped 122)
Richard et al., PRL 102, 047003 (2009)
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Mode coupling from STM (F-doped 1111)
Fasano et al., PRL 105, 167005 (2010)
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LDA Fermi Surface (1111)
x=0 x=0.1
Mazin et al., PRB 78, 085104 (2008)
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LDA Fermi surface (111)
Singh, PRB 78, 094511 (2008)
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LDA - all 5 iron d levels involved
Han et al., PRL 102, 107003 (2009)
LDA tends to overestimate the size of the AF moments
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Yildirim, PRL 101, 057010 (2008)
LDA - Magnetism and Structure
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Haule, Shim, Kotliar, PRL 100, 226402 (2008)
Dynamical Mean Field Theory
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Anisomov et al., JPCM 21, 075602 (2009)
Effective Coulomb U
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PRL 101, 026403 (2008)
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PRL 101, 057003 (2008)
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Spin resonance for s± state
Korshunov and Eremin PRB 78, 140509 (2008)
Maier and Scalapino PRB 78, 020514 (2008)
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Parker et al., PRB 78, 134524 (2008)
Dirty s± state?
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Antiferromagnetic spin fluctuations can lead to pairing (an e- with up spin wants its neighbors to have down spins) Heavy Fermions - Varma (1986), Scalapino (1986) High Tc - Scalapino (1987), Pines (1991)
-! 0 !
Vef
f (qx,!
)
qx - !
0V
eff (x
,0)
x
< Repulsive
< Attractive
single band - d-wave two band - s±
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Wang et al., PRL 102, 047005 (2009)
Functional RG, etc., show s± state to be the preferred solution
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Science 317, 705 (2007)
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PRL 100, 237001 (2008)
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So
The real question (according to some!)
is not
Are the Pnictides like the Cuprates?
but rather
Are the Cuprates like the Pnictides?
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“Here we are at 2 years and you’re asking, ‘Are we there yet, Daddy?’ Come on!” (Paul Canfield)
“The problem has a chance to be solved, and it’s a matter of refining existing theoretical tools” (Andrey Chubukov)
“If you’re interaction has the wrong sign you can reverse it by making your order parameters have opposite signs. It’s a little bit mathematical.” (Igor Mazin)
“The system could be on the verge of the Mott [insulator] transition.” (Qimiao Si)
“The parent compound is not a metallic vegetable.” (Seamus Davis)
“To take [them] as giving you information about the cuprates is to try to reconstruct the human figure from a cubist painting.” (Phil Anderson)
“The iron-based superconductors liberate us from the belief that the Mott physics is essential for high-temperature superconductivity, which is what has kept us stuck for such a long time.” (Dung-Hai Lee)
Adrian Cho Science 327, 1320 (2010)