Growth of PdCoO2 films with controlled termination by molecular-beam epitaxy and determination of their electronic structure by angle-resolved photoemission spectroscopy
Source abstract
Abstract
Utilizing the powerful combination of molecular-beam epitaxy (MBE) and angle-resolved photoemission spectroscopy (ARPES), we produce and study the effect of different terminating layers on the electronic structure of the metallic delafossite PdCoO2. Attempts to introduce unpaired electrons and synthesize new antiferromagnetic metals akin to the isostructural compound PdCrO2 have been made by replacing cobalt with iron in PdCoO2 films grown by MBE. Using ARPES, we observe similar bulk bands in these PdCoO2 films with Pd-, CoO2-, and FeO2-termination. Nevertheless, Pd- and CoO2-terminated films show a reduced intensity of surface states. Additionally, we are able to epitaxially stabilize PdFexCo1−xO2 films that show an anomaly in the derivative of the electrical resistance with respect to temperature at 20 K, but do not display pronounced magnetic order.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Copper-based nanomaterials and applications · ZnO doping and properties · Electronic and Structural Properties of Oxides
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Sciences and Engineering, Cornell University 1 , Ithaca, New York 14853, USA
Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University 2 , Ithaca, New York 14853, USA
Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University 3 , Ithaca, New York 14853, USA
SUPA, School of Physics and Astronomy, University of St Andrews 4 , St Andrews KY16 9SS, United Kingdom
Kavli Institute at Cornell for Nanoscale Science 5 , Ithaca, New York 14853, USA
Leibniz-Institut für Kristallzüchtung 6 , Max-Born-Straße 2, 12489 Berlin, Germany
Funding
Office of Science · Division of Materials Research
References (58)
Show source-provided references
1. Quantum oscillations and high carrier mobility in the delafossite PdCoO210.1103/physrevlett.109.116401 ↗
2. Nearly free electrons in a 5d delafossite oxide metal10.1126/sciadv.1500692 ↗
3. The properties of ultrapure delafossite metals10.1088/1361-6633/aa50e5 ↗
4. On the metallic conductivity of the delafossites PdCoO2 and PtCoO210.1021/cm703404e ↗
5. Fermi surface and surface electronic structure of delafossite PdCoO210.1103/physrevb.80.035116 ↗
6. Unusual transport and strongly anisotropic thermopower in PtCoO2 and PdCoO210.1103/physrevlett.104.176601 ↗
7. Origin of anisotropy and metallic behavior in delafossite PdCoO210.1103/physrevb.81.115120 ↗
8. Large anisotropic thermal conductivity of the intrinsically two-dimensional metallic oxide PdCoO210.1103/physrevb.91.041113 ↗
9. Maximal Rashba-like spin splitting via kinetic-energy-coupled inversion-symmetry breaking10.1038/nature23898 ↗
10. Comparative study of conductive delafossites with and without frustrated spins on a triangular lattice, PdMO2 (M = Cr; Co)10.1088/1742-6596/145/1/012046 ↗
11. Single crystal growth of the metallic triangular-lattice antiferromagnet PdCrO210.1016/j.jcrysgro.2010.08.043 ↗
12. Direct observation of localized spin antiferromagnetic transition in PdCrO2 by angle-resolved photoemission spectroscopy10.1038/srep03680 ↗
13. Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system10.1126/sciadv.aaz0611 ↗
14. Magnetic interactions in PdCrO2 and their effects on its magnetic structure10.1103/physrevb.98.024429 ↗
15. Strain control of fermiology and many-body interactions in two-dimensional ruthenates10.1103/physrevlett.116.197003 ↗
16. Strain-stabilized superconductivity10.1038/s41467-020-20252-7 ↗
17. Atomic-scale control of competing electronic phases in ultrathin LaNiO310.1038/nnano.2014.59 ↗
18. Engineering carrier effective masses in ultrathin quantum wells of IrO210.1103/physrevlett.121.176802 ↗
19. Single-crystal alkali antimonide photocathodes: High efficiency in the ultrathin limit10.1103/physrevlett.128.114801 ↗
20. Evolution of electronic correlations across the rutile, perovskite, and Ruddelsden-Popper iridates with octahedral connectivity10.1103/physrevb.94.121104 ↗
21. Rutile IrO2/TiO2 superlattices: A hyperconnected analog to the Ruddelsden-Popper structure10.1103/physrevmaterials.2.054206 ↗
22. Interfacial charge transfer and persistent metallicity of ultrathin SrIrO3/SrRuO3 heterostructures10.1126/sciadv.abj0481 ↗
23. Evidence of cooperative effect on the enhanced superconducting transition temperature at the FeSe/SrTiO3 interface10.1038/s41467-019-08560-z ↗
24. Nodeless superconducting phase arising from a strong (π, π) antiferromagnetic phase in the infinite-layer electron-doped Sr1−xLaxCuO2 compound10.1103/physrevlett.109.267001 ↗
25. Doping evolution and polar surface reconstruction of the infinite-layer cuprate Sr1−xLaxCuO210.1103/physrevb.92.035149 ↗
26. Formation and observation of a quasi-two-dimensional dxy electron liquid in epitaxially stabilized Sr2−xLaxTiO4 thin films10.1103/physrevlett.115.096405 ↗
27. Electron doping of the parent cuprate La2CuO4 without cation substitution10.1103/physrevlett.117.147002 ↗
28. Controlling surface carrier density by illumination in the transparent conductor La-doped BaSnO310.1063/1.5020716 ↗
29. Mott gap collapse in lightly hole-doped Sr2−xKxIrO410.1038/s41467-020-16425-z ↗
30. Electric dipole effect in PdCoO2/β-Ga2O3 Schottky diodes for high-temperature operation10.1126/sciadv.aax5733 ↗
31. Nonreciprocal transport in a Rashba ferromagnet, delafossite PdCoO210.1021/acs.nanolett.1c02756 ↗
32. O2 electrocatalysis on thin film metallic oxide electrodes with the delafossite structure10.1149/1.2130047 ↗
33. Highly conductive PdCoO2 ultrathin films for transparent electrodes10.1063/1.5027579 ↗
34. Large thermopower anisotropy in PdCoO2 thin films10.1103/physrevmaterials.3.085403 ↗
35. Pulsed-laser epitaxy of metallic delafossite PdCrO2 films10.1063/1.5144743 ↗
36. Inhomogeneous interface dipole effect at the Schottky junctions of PdCrO2 on β-Ga2O3 (2̄01) substrates10.1063/5.0011783 ↗
37. Growth of metallic delafossite PdCoO2 by molecular beam epitaxy10.1103/physrevmaterials.3.093401 ↗
38. Growth of PdCoO2 by ozone-assisted molecular-beam epitaxy10.1063/1.5130627 ↗
39. Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films10.1103/physrevresearch.2.013282 ↗
40. Anisotropic electric conductivity of delafossite PdCoO2 studied by angle-resolved photoemission spectroscopy10.1103/physrevlett.102.256404 ↗
41. Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO210.1073/pnas.1811873115 ↗
42. 2019
43. Difference in magnetic and ferroelectric properties between rhombohedral and hexagonal polytypes of AgFeO2: A single-crystal study10.1103/physrevb.99.064402 ↗
44. Spiral-spin-driven ferroelectricity in a multiferroic delafossite AgFeO210.1103/PhysRevLett.109.097203 ↗
45. Electronic structure and optical properties of AFeO2 (A = Ag, Cu) within GGA calculations10.1021/cm062481c ↗
46. Application of delafossite AgFeO2 nanoparticles as SERS substrate and antimicrobial agent10.1002/slct.202004445 ↗
47. Crystal chemistry and electrical properties of the delafossite structure10.1016/j.tsf.2005.08.316 ↗
48. Predictions of compounds in the family of delafossites10.1007/s10947-009-0013-3 ↗
49. Identification of novel Cu, Ag, and Au ternary oxides from global structural prediction10.1021/acs.chemmater.5b00716 ↗
50. High-throughput search of ternary chalcogenides for p-type transparent electrodes10.1038/srep43179 ↗
51. A theory of pseudomorphism in thin films10.1016/0025-5416(69)90004-4 ↗
52. Theory of ‘pseudomorphic stabilization’ of metastable phases in thin film form
53. Strain-assisted epitaxial growth of new ordered compounds10.1103/physrevlett.57.599 ↗
54. Structural transitions in epitaxial overlayers10.1051/jphys:0198600470120205500 ↗
55. Structural phenomena in coherent epitaxial solids10.1016/0022-0248(89)90180-2 ↗
56. The role of heteroepitaxy in the development of new thin-film oxide-based functional materials10.1070/RC2004v073n09ABEH000919 ↗
57. Extremely large magnetoresistance in the nonmagnetic metal PdCoO210.1103/PhysRevLett.111.056601 ↗
58. Unconventional magneto-transport in ultrapure PdCoO2 and PtCoO210.1038/s41535-018-0138-8 ↗