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Tunable superconductivity at the oxide-insulator/KTaO interface and its origin
Changjiang Liu, Xianjing Zhou, Deshun Hong +6
Superconductivity forms out of the condensation of Cooper pairs of electrons. The mechanism by which Cooper pairs are created in non-conventional superconductors is often elusive b…
Low Valence Nickelates: Launching the Nickel Age of Superconductivity
Antia S. Botana, Kwan-Woo Lee, Michael R. Norman +2
The discovery of superconductivity in thin films (10 nm) of infinite-layer hole-doped NdNiO has invigorated the field of high-temperature superconductivity research, revi…
Role of Oxygen States in the Low Valence Nickelate LaNiO
Y. Shen, J. Sears, G. Fabbris +13
The discovery of superconductivity in square-planar low valence nickelates has ignited a vigorous debate regarding their essential electronic properties: Do these materials have ap…
Quantum Hall Superconductivity from Moir{é} Landau Levels
Gaurav Chaudhary, A. H. MacDonald, M. R. Norman
It has long been speculated that quasi-two-dimensional superconductivity can reappear above its semiclassical upper critical field due to Landau quantization, yet this reentrant pr…
Strong Superexchange in a Nickelate Revealed by Resonant Inelastic X-Ray Scattering
J. Q. Lin, P. Villar Arribi, G. Fabbris +20
The discovery of superconductivity in a nickelate has inspired disparate theoretical perspectives regarding the essential physics of this class of materials. A key issue…
Similarities and differences between infinite-layer nickelates and cuprates and implications for superconductivity
Antia S. Botana, Michael R. Norman
We have revisited the electronic structure of infinite-layer RNiO (R= La, Nd) in light of the recent discovery of superconductivity in Sr-doped NdNiO. From a comparison to…
Quantum oscillations in a biaxial pair density wave state
M. R. Norman, J. C. Seamus Davis
There has been growing speculation that a pair density wave state is a key component of the phenomenology of the pseudogap phase in the cuprates. Recently, direct evidence for such…
Electronic structure of CuTeO and its relationship to cuprates
Antia S. Botana, Michael R. Norman
Based on first principles calculations, the electronic structure of CuTeO is discussed in the context of superconducting cuprates. Despite some significant crystallographic dif…
Symmetry enforced line nodes in unconventional superconductors
T. Micklitz, M. R. Norman
We classify line nodes in superconductors with strong spin-orbit interactions and time-reversal symmetry, where the latter may include non-primitive translations in the magnetic Br…
Nodal lines and nodal loops in non-symmorphic odd-parity superconductors
T. Micklitz, M. R. Norman
We discuss the nodal structure of odd-parity superconductors in the presence of non-symmorphic crystal symmetries, both with and without spin-orbit coupling, and with and without t…
Destroying coherence in high temperature superconductors with current flow
A. Kaminski, S. Rosenkranz, M. R. Norman +4
The loss of single-particle coherence going from the superconducting state to the normal state in underdoped cuprates is a dramatic effect that has yet to be understood. Here, we a…
Measurement of the dynamic charge response of materials using low-energy, momentum-resolved electron energy-loss spectroscopy (M-EELS)
Sean Vig, Anshul Kogar, Matteo Mitrano +9
One of the most fundamental properties of an interacting electron system is its frequency- and wave-vector-dependent density response function, . The imaginary part,…
Effect of the pseudogap on T in the cuprates and implications for its origin
Vivek Mishra, U. Chatterjee, J. C. Campuzano +1
One of the most intriguing aspects of cuprates is a large pseudogap coexisting with a high superconducting transition temperature. Here, we study pairing in the cuprates from elect…
Electronic phase diagram of high temperature copper oxide superconductors
U. Chatterjee, J. Zhao, D. Ai +8
In order to understand the origin of high-temperature superconductivity in copper oxides, we must understand the normal state from which it emerges. Here, we examine the evolution…
Unconventional Superconductivity
M. R. Norman
A brief review of unconventional superconductivity is given, stretching from the halcyon days of helium-3 to the modern world of Majorana fermions. Along the way, we will encounter…
The Challenge of Unconventional Superconductivity
M. R. Norman
During the past few decades, several new classes of superconductors have been discovered. Most of these do not appear to be related to traditional superconductors. As a consequence…
Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2
J. -P. Castellan, S. Rosenkranz, E. A. Goremychkin +13
We report inelastic neutron scattering measurements of the resonant spin excitations in Ba1-xKxFe2As2 over a broad range of electron band filling. The fall in the superconducting t…
Symmetry of the charge density wave in cuprates
Ashot Melikyan, M. R. Norman
We derive and analyze an effective Ginzburg-Landau (GL) functional for a charge density wave (CDW) for a model of electrons on a tight binding square lattice with density-density i…
Probing the pseudogap phase of cuprates by a Giaever transformer
Alex Levchenko, M. R. Norman
We develop a theory of the rectification effect in a double-layer system where both layers are superconductors, or one of the layers is a normal metal. The Coulomb interaction is a…
Revealing the ortho-II Band Folding in YBa2Cu3O7-delta Films
Y. Sassa, M. Radovic, M. Månsson +10
We present an angle-resolved photoelectron spectroscopy study of YBa2Cu3O7-delta films in situ grown by pulsed laser deposition. We have successfully produced underdoped surfaces w…
Nematic spin fluid in the tetragonal phase of BaFe2As2
Leland W. Harriger, Huiqian Luo, Mengshu Liu +5
Magnetic interactions are generally believed to play a key role in mediating electron pairing for superconductivity in iron arsenides; yet their character is only partially underst…
The Nernst effect from fluctuating pairs in the pseudogap phase
A. Levchenko, M. R. Norman, A. A. Varlamov
The observation of a large Nernst signal in cuprates above the superconducting transition temperature has attracted much attention. A potential explanation is that it originates fr…
A proposal to detect vortices above the superconducting transition temperature
Zoran Ristivojevic, M. R. Norman
We propose a simple experiment to determine whether vortices persist above the superconducting transition temperature Tc in the pseudogap phase of high temperature cuprate supercon…
Transport implications of Fermi arcs in the pseudogap phase of the cuprates
A. Levchenko, T. Micklitz, M. R. Norman +1
We derive the fermionic contribution to the longitudinal and Hall conductivities within a Kubo formalism, using a phenomenological Greens function which has been previously develop…