Publications

Selected papers since 1998

O. Nesher, G. Koren, E. Polturak and G. Deutscher, Proximity Effect in bilayers of YBa₂Cu_2.7Fe_0.3O_y and YBa₂Cu₃O_7-δ, Appl. Phys. Lett. 72, 1769 (1998).
O. Nesher and G. Koren, Observation of Tomasch Oscillations and Tunneling-Like Behavior in Oxygen Deficient Edge Junctions. Appl. Phys. Lett. 74, 3392 (1999).
E. Polturak, G. Koren, M. Ayalon, I. Flohr, R. Waller and M. Guelman, Design and Performance of a Spaced Based High Temperature Superconductivity Experiment, Appl. Phys. Lett. 75, 1293 (1999).
O. Nesher and G. Koren, Measurements of $\Delta$ and $v_F$ from Andreev Reflections and McMillan-Rowell Oscillations in Edge Junctions of $YBa_2Cu_3O_{6.6}/YBa_2Cu_{2.55}Fe_{0.45}O_y/YBa_2Cu_3O_{6.6}$. Phys. Rev. B. 60, 9287 (1999).
N. D. Zakharov, K. M. Satyalakshmi, G. Koren and D. Hesse, Substrate Temperature Dependence of Structure and Resistivity of $SrRuO_3$ Thin Films Grown by Pulse Laser Deposition on (100) $SrTiO_3$. Journal of Materials Research, 14, 4385 (1999). DOI: https://doi.org/10.1557/JMR.1999.0593
O. Nesher and G. Koren, Directional In-Plane Tunneling in Oxygen Deficient $YBa_2Cu_3O_{6.6}/YBa_2Cu_{2.55}Fe_{0.45}O_y/YBa_2Cu_3O_{6.6}$ Edge Junctions, Phys. Rev. B. 60, 14893 (1999).
G. Koren, E. Polturak, N. Levy and G. Deutscher, Angular Dependence of the Critical Current in Thin $YBa_2Cu_3O_{7-\delta}$ Films with Unidirectional Nanocracks, Phys. Rev. B. 61, 3734 (2000).
G. Koren, N. Levy, E. Polturak and Y. Koral, Demonstration of Power Handling of 0.5 kW at 0.4 GHz in a Stripline of $YBa_2Cu_3O_{7-\delta}$ on 3″ LaAlO_3 Wafer. Presented at EUCAS’99, Sept. 1999, Barcelona, Spain.
R. Carmi, E. Polturak, G. Koren and A. Auerbach, Spontaneous Macroscopic Magnetization at the Superconducting Transition Temperature of YBCO, Nature 404, 853 (2000).
R. Carmi, E. Polturak, and G. Koren, Observation of Spontaneous Flux Generation in a Multi-Josephson-Junction Loop, Phys. Rev. Lett. 84 , 4966 (2000).
A. Barman and G. Koren, Thickness Dependent Transport Properties of Nd_2/3Sr_1/3MnO₃ Thin Films, Appl. Phys. Lett. 77, 1674 (2000).
A. Sharoni, G. Koren and O. Millo, Correlation of Tunneling Spectra with Surface Nano-morphology and Doping in Thin YBCO Films, Europhys. Lett. 54 , 675 (2001).
G. Koren and N. Levy, Experimental evidence for a small s-wave component in the order parameter of underdoped YBCO, Europhys. Lett. 59, 121 (2002). Note that the scales in Fig.1 are in nm.
G. Koren and E. Polturak, Is LaAlO_3 a viable substrate for the deposition of high quality thin films of YBCO? Superconductor Science and Technology, 15, 1335 (2002). DOI: https://10.0.4.64/0953-2048/15/9/311
G. Koren, N. Levy and E. Polturak, Observation of three energy scales (energy gaps) in the conductance of underdoped YBCO junctions, MOS2002 paper, Journal of Low Temperature Physics, 131, 849 (2003). DOI: https://doi.org/10.1023/A:1023435228417
I. Lubimova and G. Koren, Simulations of experimental conductance spectra of YBa₂Cu₃O_y junctions: Role of a long d-wave decay length and a small is component in the pair potential near the interface, Phys. Rev. B. 68, 224519 (2003). DOI: https://doi.org/10.1103/PhysRevB.68.224519.
A. Maniv, E. Polturak and G. Koren, Observation of magnetic flux generated spontaneously during a rapid quench of superconducting films, Phys. Rev. Lett. 91, 197001 (2003). DOI: https://doi.org/10.1103/PhysRevLett.91.197001.
A. Sharoni, I. Asulin, G. Koren and O. Millo, Proximity effect in gold coated YBCO films studied by scanning tunneling spectroscopy, Phys. Rev. Lett. 92, 017003 (2004). DOI: https://doi.org/10.1103/PhysRevLett.92.017003.
G. Koren, L. Shkedy and E. Polturak, Observation of a common symmetry for the pseudogap and the superconducting order parameter in underdoped YBCO, Physica C 403, 45 (2004). DOI: https://doi.org/10.1016/j.physc.2003.11.012
L. Shkedy, P. Aronov, G. Koren and E. Polturak, Observation of McMillan-Rowell like oscillations in underdoped YBCO junctions oriented along the node of the d-wave order parameter, Phys. Rev. B. 69, 132507 (2004).
I. Asulin, A. Sharoni, O. Yulli, G. Koren and O. Millo, Annomalous proximity effect in gold coated (110) YBCO films: Penetration of the Andreev bound states, Phys. Rev. Lett. 93, 157001 (2004).
D. E. Oates, S. H. Park and G. Koren, Observation of the Non linear Meissner effect in YBCO thin films: Evidence for a d-wave order parameter in the bulk of the cuprates superconductors, Phys. Rev. Lett. 93, 197001 (2004).
L. Shkedy, E. Polturak and G. Koren, Magnetoresistance of YBCO junctions with Ga-doped barrier, Phys. Rev. B. 71, 134502 (2005).
A. Maniv, E. Polturak, G. Koren, Y. Bliokh, B. Biehler, B. Runge, P. Leiderer, B. Shapiro and I. Shapiro, Observation of a new mechanism of spontaneous generation of magnetic flux in a superconductor, Phys. Rev. Lett. 94, 247005 (2005).
P. Aronov and G. Koren, Signature of a crossed Andreev reflection effect (CARE) in the magnetic response of YBCO junctions with the itinerant ferromagnet SrRuO_3, Phys. Rev. B. 72, 184515 (2005). DOI: https://doi.org/10.1103/PhysRevB.72.184515. arxiv:cond-mat/0508753.
G. Koren, P. Aronov and E. Polturak, Experimental search for flux flow resistivity anisotropy in the a-b plane of optimally doped epitaxial thin films of YBCO. Phys. Rev. B. 72, 212503 (2005). DOI: https://doi.org/10.1103/PhysRevB.72.212503. arXiv:cond-mat/0508754.
I. Asulin, Y. Ofer, G. Koren and O. Millo, Evidence for crossed Andreev reflection in bilayers of (100)YBCO and the itinerant ferromagnet SrRuO_3. Phys. Rev. B. 74, 092501 (2006).DOI: https://doi.org/10.1103/PhysRevB.74.092501. arXiv:cond-mat/0605573.
B. Kalisky, P. Aronov, G. Koren, A. Shaulov, Y. Yeshurun and R. P. Huebener, Flux flow resistivity anisotropy in the instability regime in the a-b plane of epitaxial YBCO thin films. Phys. Rev. Lett. 97, 067003 (2006).DOI: https://doi.org/10.1103/PhysRevLett.97.067003. arXiv:cond-mat/0606667.
G. Koren, Y. Mor, A. Auerbach and E. Polturak, Quantum vortex tunneling in YBCO thin films, Phys. Rev. B. 76, 134516 (2007). DOI: https://doi.org/10.1103/PhysRevB.76.134516. arxiv:0707.2484v1.
G. Aharonovich, G. Koren and E. Polturak, A study of the ferromagnetic transition of SRO in bilayers with YBCO, LSCO, Au and Cr: Signature of injected carriers in the pseudogap regime. Phys. Rev. B. 76, 224514 (2007). DOI: https://doi.org/10.1103/PhysRevB.76.224514. arXiv:0707.2497
I. Asulin, O. Yuli, I. Felner, G. Koren and O. Millo, Penetration of Andreev bound states into the ferromagnet in an SRO/(110)YBCO bilayer:A scanning tunneling spectroscopy study, Phys. Rev. B. 76, 064507 (2007).
I. Asulin, O. Yuli, G. Koren and O. Millo, Evidence for induced magnetization in superconductor-ferromagnet heterostructures: A scanning tunneling spectroscopy study, Phys. Rev. B. 79, 174524 (2009). DOI: https://doi.org/10.1103/PhysRevB.79.174524
G. Koren and O. Millo, Conventional proximity effect in bilayers of superconducting underdoped $La_{1.88}Sr_{0.12}CuO_4$ islands coated with non superconducting 2009overdoped $La_{1.65}Sr_{0.35}CuO_4$, Phys. Rev. B. 80, 054507 (2009). DOI: https://doi.org/10.1103/PhysRevB.80.054507. arXiv.org/abs/0904.1928v1 (April 2009)
O. Yuli, I. Asulin, Y. Kalcheim, G. Koren and O. Millo, Proximity induced pseudogap: evidence for preformed pairs, Phys. Rev. Lett. 103, 197003 (2009). DOI: https://doi.org/10.1103/PhysRevLett.103.197003
T. Kirzhner and G. Koren, Interface effects in d-wave superconductor-ferromagnet junctions in the vicinity of domain walls, Phys. Rev. B. 82, 134507 (2010). DOI: https://doi.org/10.1103/PhysRevB.82.134507
G. Koren and T. Kirzhner, Observation of two Andreev-like energy scales in La_2-xSr _xCuO₄ superconductor-normal-metal-superconductor junctions, Phys. Rev. Lett. 106, 017002 (2011). DOI: https://doi.org/10.1103/PhysRevLett.106.017002
Y. Kalcheim, T. Kirzhner, G. Koren and O. Millo, Long-range proximity effect in La_2/3Ca_1/3MnO₃/(100)YBa₂Cu₃O7_-δ ferromagnet/superconductor bilayers: Evidence for induced triplet superconductivity in the ferromagnet, Phys. Rev. B. 83, 064510 (2011). DOI: https://doi.org/10.1103/PhysRevB.83.064510
G. Koren, T. Kirzhner, E. Lahoud, K. B. Chashka, and A. Kanigel, Proximity-induced superconductivity in topological Bi ₂Te ₂Se and Bi ₂Se ₃ films: Robust zero-energy bound state possibly due to Majorana fermions. Phys. Rev. B. 84, 224521 (2011). arXiv:1111.3445.
G. Koren, T. Kirzhner, and P. Aronov, Critical current measurements in superconductor – ferromagnet – superconductor junctions of $YBa_2Cu_3O_y-SrRuO_3-YBa_2Cu_3O_y$: No evidence for a dominant proximity induced triplet superconductivity in the ferromagnetic barrier. Phys. Rev. B. 85, 024514 (2012). DOI: https://doi.org/10.1103/PhysRevB.85.024514. arXiv:1107.0808.
D. Golubchik, E. Polturak and G. Koren, Mass of a vortex in a superconducting film measured via magneto-optical imaging plus ultrafast heating and cooling, Phys. Rev. B. 85, 060504(R) (2012). DOI: https://doi.org/10.1103/PhysRevB.85.060504
G. Koren and T. Kirzhner, Zero energy bound states in tunneling conductance spectra at the interface of an s-wave superconductor and a topological insulator in NbN- Bi_2Se_3-Au thin film junctions, Phys. Rev. B 86, 144508 (2012). DOI: https://doi.org/10.1103/PhysRevB.86.144508
G. Koren, T. Kirzhner, Y. kalcheim and O. Millo, Signature of proximity induced triplet superconductivity in junctions made of the doped topological insulator $\rm Bi_2Se_3$ and the s-wave superconductor NbN, EPL 103, 67010 (2013), arXiv:1303.0652v1.
Tal Kirzhner and Gad Koren, Pairing and the phase diagram of the normal coherence length ζ_n (T, x) above Tc of La₂ _– _X Sr_x CuO₄ thin films probed by the Josephson effect, Sci. Rep. 4, 6244; DOI:10.1038/srep06244 (2014).
Gad Koren, Reflections on the First Year of PLD of High Temperature Superconducting Thin Films and Some Recent Advances in PLD of Topological Superconducting NbN-Bi_2Se_3-Au Junctions, Journal of Materials Science and Engineering A 4 (11) (2014) 334-339.
G. Koren, Proximity effects at the interface of a superconductor and a topological insulator in NbN-Bi₂Se₃ thin film bilayers, Supercond. Sci. Technol. 28 025003 (2015), arXiv:1409.2975.
Gad Koren, Magnetoresistance and gating effects in ultrathin NbN-Bi_2Se_3 bilayers, Condensed Matter 2017, 2, 14; doi:https://doi.org/10.3390/condmat2020014 arXiv:1506.08584 [cond-mat.supr-con], (2015).
Gad Koren and Patrick Lee, Observation of two distinct pairs fluctuation lifetimes and supercurrents in the pseudogap regime of cuprate junctions, Phys. Rev. B. 94, 174515 (2016), arxiv:1609.01432.
Gad Koren, Proximity effects and pair currents in cuprate junctions, Supercond. Sci. Technol. 30, 045008 (2017), arXiv:1611.05158 [cond-mat.supr-con], (2016).
Gad Koren, Magnetic proximity effects of a topological insulator and a ferromagnet in thin film bilayers of BiSbTe_3 and SrRuO_3, Phys. Rev. B. 97, 054405 (2018). arXiv:1711.04275 [cond-mat.str-el].
Gad Koren, Strongly suppressed superconducting proximity effect and ferromagnetism in trilayers of Bi_2Se_3 / SrRuO_3 / underdoped YBa_2Cu_3O_x: A possible new platform for Majorana nano-electronics, Supercond. Sci. Technol. 31, 075004 ( 2018 ), arXiv:1802.03728 [cond-mat.supr-con].
G. Koren, Tunneling and bound states in near-edge NbN-Bi2Se3 junctions fabricated by deposition through a wire shadow mask, arXiv:1803.10046 [cond-mat.supr-con], March 2018 .
Oded Millo and Gad Koren, What can Andreev bound states tell us about superconductors? Philosophical Transactions of the Royal Society A, 6 August 2018 Volume 376, issue 2125, DOI: 10.1098/rsta.2014.0143
Gad Koren, Gating of Au-Bi_2Se_3-NbN ramp-type junctions with superconducting NbN gate-electrode and SrTiO_3 film as the gate-insulator, arXiv:1808.06805 [cond-mat.supr-con], August 2018.
Tamar Shapira, Hen Alpern, Shira Yochelis, Ting-Kuo Lee, Chao-Cheng Kaun, Yossi Paltiel, Gad Koren and Oded Millo, Unconventional order parameter induced by helical chiral molecules adsorbed on a metal proximity coupled to a superconductor, Phys. Rev. B. 98, 214513 (2018). DOI:https://doi.org/10.1103/PhysRevB.98.214513
A. Mukherjee, J. Seo, M. M. Arik, H. Zhang, C. C. Zhang, T. Kirzhner, D. K. George, A. G. Markelz, N. P. Armitage, G. Koren, J. Y. T. Wei, and J. Cerne, Linear dichroism infrared resonance in overdoped, underdoped, and optimally doped cuprate superconductors, Phys. Rev. B. 102, 054520 (2020). DOI:https://doi.org/10.1103/PhysRevB.102.054520
Gad Koren, Anna Eyal, Leomid Iomin and Yuval Nitzav, Observation of Josephson-like tunneling junction characteristics and positive magnetoresistance in Oxygen deficient Nickelate films of Nd_0.8Sr_0.2NiO_3−δ, Materials 14, 7689 (2021). arXiv:2010.05277 [cond-mat.supr-con], October 2020 V1 , December 2020 V2 .