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Quasiparticle interference in LiFeAs: Signature of inelastic tunneling through spin fluctuations
Shun Chi, Carolina A. Marques, Walter N. Hardy +5
Quasiparticle interference (QPI) is a powerful tool to characterize the symmetry of the superconducting order parameter in unconventional superconductors, by mapping the spatial de…
Thermal Hall conductivity in the strongest cuprate superconductor: Estimate of the mean free path in the trilayer cuprate HgBaCaCuO
Munkhtuguldur Altangerel, Quentin Barthélemy, Étienne Lefrançois +12
The thermal Hall conductivity of the trilayer cuprate HgBaCaCuO (Hg1223) - the superconductor with the highest critical temperature at ambient pressure -…
Absence of Fermi surface reconstruction in pressure-driven overdoped YBCO
Stanley W. Tozer, William A. Coniglio, Tobias Förster +5
The evolution of the critical superconducting temperature and field, quantum oscillation frequencies and effective mass in underdoped YBaCuO (YBCO) crystals…
Searching for the signature of a pair density wave in YBaCuO using high energy X-ray diffraction
Elizabeth Blackburn, Oleh Ivashko, Emma Campillo +7
We have carried out a search for a pair density wave signature using high-energy X-ray diffraction in fields up to 16 T. We do not see evidence for a signal at the predicted waveve…
The Three-Dimensional Electronic Structure of LiFeAs: Strong-coupling Superconductivity and Topology in the Iron Pnictides
Ryan P. Day, MengXing Na, Manuel Zingl +15
Amongst the iron-based superconductors, LiFeAs is unrivalled in the simplicity of its crystal structure and phase diagram. However, our understanding of this canonical compound suf…
Orbital Symmetries of Charge Density Wave Order in YBa2Cu3O6+x
Christopher McMahon, A. J. Achkar, E. H. da Silva Neto +10
Charge density wave (CDW) order has been shown to compete and coexist with superconductivity in underdoped cuprates. Theoretical proposals for the CDW order include an unconvention…
Anisotropy of the Seebeck Coefficient in the Cuprate Superconductor YBaCuO: Fermi-Surface Reconstruction by Bidirectional Charge Order
O. Cyr-Choinière, S. Badoux, G. Grissonnanche +11
The Seebeck coefficient of the cuprate YBaCuO was measured in magnetic fields large enough to suppress superconductivity, at hole dopings and $p =…
Broken rotational symmetry on the Fermi surface of a high-T superconductor
B. J. Ramshaw, N. Harrison, S. E. Sebastian +6
Broken fourfold rotational (C) symmetry is observed in the experimental properties of several classes of unconventional superconductors. It has been proposed that this symmetry…
Investigation of potential fluctuating intra-unit cell magnetic order in cuprates by muon spin relaxation
A. Pal, K. Akintola, M. Potma +6
We report low temperature muon spin relaxation (muSR) measurements of the high-transition-temperature (Tc) cuprate superconductors Bi{2+x}Sr{2-x}CaCu2O{8+δ} and YBa2Cu3O6.57, aimed…
Change of carrier density at the pseudogap critical point of a cuprate superconductor
S. Badoux, W. Tabis, F. Laliberté +10
The pseudogap is a central puzzle of cuprate superconductors. Its connection to the Mott insulator at low doping remains ambiguous and its relation to the charge order that rec…
Magnetization of underdoped YBaCuO above the irreversibility field
Jing Fei Yu, B. J. Ramshaw, I. Kokanović +9
Torque magnetization measurements on YBaCuO (YBCO) at doping (), in DC fields () up to 33 T and temperatures down to 4.5 K, show that weak diamagne…
Two types of nematicity in the phase diagram of the cuprate superconductor YBaCuO
O. Cyr-Choinière, G. Grissonnanche, S. Badoux +6
Nematicity has emerged as a key feature of cuprate superconductors, but its link to other fundamental properties such as superconductivity, charge order and the pseudogap remains u…
Wiedemann-Franz law in the underdoped cuprate superconductor YBa2Cu3Oy
G. Grissonnanche, F. Laliberte, S. Dufour-Beausejour +16
The recent detection of charge-density modulations in YBa2Cu3Oy and other cuprate superconductors raises new questions about the normal state of underdoped cuprates. In one class o…
Sensitivity of to pressure and magnetic field in the cuprate superconductor YBaCuO: evidence of charge order suppression by pressure
O. Cyr-Choinière, D. LeBoeuf, S. Badoux +7
Cuprate superconductors have a universal tendency to form charge density-wave (CDW) order which competes with superconductivity and is strongest at a doping . Here w…
Evidence for a small hole pocket in the Fermi surface of underdoped YBa2Cu3Oy
N. Doiron-Leyraud, S. Badoux, S. Rene de Cotret +13
The Fermi surface of a metal is the fundamental basis from which its properties can be understood. In underdoped cuprate superconductors, the Fermi surface undergoes a reconstructi…
Thermodynamic signature of a magnetic-field-driven phase transition within the superconducting state of an underdoped high-temperature superconductor
J. B. Kemper, O. Vafek, J. B. Betts +5
More than a quarter century after the discovery of the high temperature superconductor (HTS) YBaCuO (YBCO) studies continue to uncover complexity in its phase diagr…
Disorder induced power-law response of a superconducting vortex on a plane
N. Shapira, Y. Lamhot, O. Shpielberg +6
We report drive-response experiments on individual superconducting vortices on a plane, a realization for a 1+1-dimensional directed polymer in random media. For this we use magnet…
Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
Shun Chi, S. Johnston, G. Levy +10
Quasiparticle interference (QPI) by means of scanning tunneling microscopy/spectroscopy (STM/STS), angle resolved photoemission spectroscopy (ARPES), and multi-orbital tight bind-…
Direct measurement of the upper critical field in a cuprate superconductor
G. Grissonnanche, O. Cyr-Choiniere, F. Laliberte +20
The upper critical field Hc2 is a fundamental measure of the pairing strength, yet there is no agreement on its magnitude and doping dependence in cuprate superconductors. We have…
Thermodynamic phase diagram of static charge order in underdoped YBCO
David LeBoeuf, S. Krämer, W. N. Hardy +3
The interplay between superconductivity and any other competing order is an essential part of the long-standing debate on the origin of high temperature superconductivity in cuprat…
Bounding the pseudogap with a line of phase transitions in YBCO cuprate superconductors
Arkady Shekhter, B. J. Ramshaw, Ruixing Liang +7
Close to optimal doping, the copper oxide superconductors show 'strange metal' behavior, suggestive of strong fluctuations associated with a quantum critical point. Such a critical…
Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
J. Chang, E. Blackburn, A. T. Holmes +10
Superconductivity often emerges in the proximity of, or in competition with, symmetry breaking ground states such as antiferromagnetism or charge density waves (CDW)1-5. A number o…
Bound States of Defects in Superconducting LiFeAs Studied by Scanning Tunneling Spectroscopy
S. Grothe, Shun Chi, P. Dosanjh +5
Defects in LiFeAs are studied by scanning tunneling microscopy (STM) and spectroscopy (STS). Topographic images of the five predominant defects allow the identification of their po…
Coherent c-axis transport in the underdoped cuprate superconductor YBCO
B. Vignolle, B. J. Ramshaw, James Day +7
The electrical resistivity rho_c of the underdoped cuprate superconductor YBCO was measured perpendicular to the CuO_2 planes on ultra-high quality single crystals in magnetic fiel…