Homogeneous superconducting gap in Dy Ba 2 Cu 3 O 7 - δ synthesized by oxide molecular beam epitaxy

Wu, Ze-Bin; Putzky, Daniel; Kundu, Asish K.; Li, Hui; Yang, Shize; Du, Zengyi; Joo, Sang Hyun; Lee, Jinho; Zhu, Yimei; Logvenov, Gennady; Keimer, Bernhard; Fujita, Kazuhiro; Valla, Tonica; Božović, Ivan; Drozdov, Ilya K.

doi:10.1103/physrevmaterials.4.124801

Title: Homogeneous superconducting gap in $Dy {Ba}_{2} {Cu}_{3} O_{7 - δ}$ synthesized by oxide molecular beam epitaxy

Journal Article · Thu Dec 03 00:00:00 EST 2020 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.4.124801· OSTI ID:1762756

^[1]; Putzky, Daniel ^[2]; Kundu, Asish K. ^[1]; Li, Hui ^[3];

^[1]; Du, Zengyi ^[1]; Joo, Sang Hyun ^[4]; Lee, Jinho ^[4]; Zhu, Yimei ^[1]; Logvenov, Gennady ^[2]; Keimer, Bernhard ^[2]; Fujita, Kazuhiro ^[1];

^[1];

^[5];

^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Max Planck Inst. for Solid State Research, Stuttgart (Germany)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Seoul National Univ. (Korea, Republic of)
Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)

Much of what is known about high-temperature cuprate superconductors stems from studies based on two surface analytical tools, angle-resolved photoemission spectroscopy (ARPES) and spectroscopic imaging scanning tunneling microscopy (SI-STM). A question of general interest is whether and when the surface properties probed by ARPES and SI-STM are representative of the intrinsic properties of bulk materials. We find this question is prominent in thin films of a rarely studied cuprate $Dy {Ba}_{2} {Cu}_{3} O_{7 - δ}$ DBCO). We synthesize DBCO films by oxide molecular beam epitaxy and study them by in situ ARPES and SI-STM. Both ARPES and SI-STM show that the surface DBCO layer is different from the bulk of the film—it is heavily underdoped, while the doping level in the bulk is close to optimal doping evidenced by bulk-sensitive mutual inductance measurements. ARPES shows the typical electronic structure of a heavily underdoped CU O₂ plane and two sets of one-dimensional bands originating from the CuO chains with one of them gapped. SI-STM reveals two different energy scales in the local density of states, with one (at ~ 18 meV ) corresponding to the superconductivity and the other one (at ~ 90 meV ) to the pseudogap. Finally, while the pseudogap shows large variations over the length scale of a few nanometers, the superconducting gap is very homogeneous. This indicates that the pseudogap and superconductivity are of different origins.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); European Union (EU); Institute for Basic Science in Korea; Seoul National University; National Research Foundation of Korea (NRF)

Grant/Contract Number:: SC0012704; AC02-98CH10886; 823717ESTEEM3; IBS-R009-G2

OSTI ID:: 1762756

Report Number(s):: BNL-220903-2021-JAAM; TRN: US2205906

Journal Information:: Physical Review Materials, Vol. 4, Issue 12; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Homogeneous superconducting gap in $Dy {Ba}_{2} {Cu}_{3} O_{7 - δ}$ synthesized by oxide molecular beam epitaxy