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Title: Magnetic penetration depth in Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films

Abstract

The penetration depth {lambda}({ital T}) in YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films, with {ital M}=Ni or Zn and nominal concentrations, 0.02{le}{ital x}{le}0.06, is obtained from the mutual inductance of coaxial coils on opposite sides of the films. Both Ni and Zn increase {lambda}(0) very rapidly, such that the superfluid density, {ital n}{sub {ital s}}(0){proportional_to}{lambda}{sup {minus}2}(0), decreases by a factor of 2 for each percent of dopant. The rapid increase in {lambda}(0) implies that disorder fills in the superconducting density of states at low energy, so that {ital N}{sub {ital S}}(0) is roughly 80--95 % of the normal-state density of states. An analytic {ital d}-wave theory, valid at {ital T}=0, finds that {lambda}(0) increases rapidly with disorder, but not as rapidly as observed. It is striking that the dependence of {lambda}({ital T}/{ital T}{sub {ital c}}) on {ital T}/{ital T}{sub {ital c}} does not change significantly as {ital x} increases from 2% to 6%, although it is different from undoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films. An {ital ad} {ital hoc} phenomenological model finds that one should expect this result. Finally, the values of {ital N}{sub {ital S}}(0) deduced from {lambda} are somewhat larger than values deduced from specific-heatmore » measurements on Zn-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, which also indicate increasing gaplessness with doping.« less

Authors:
; ;  [1]; ;  [2]
  1. Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
OSTI Identifier:
26054
DOE Contract Number:  
FG02-90ER45427
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 51; Journal Issue: 14; Other Information: PBD: 1 Apr 1995
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; SUPERCONDUCTING FILMS; PENETRATION DEPTH; COPPER OXIDES; BARIUM OXIDES; YTTRIUM OXIDES; NICKEL; ZINC; HIGH-TC SUPERCONDUCTORS; DOPED MATERIALS; TEMPERATURE DEPENDENCE; QUATERNARY ALLOY SYSTEMS

Citation Formats

Ulm, E R, Kim, J, Lemberger, T R, Foltyn, S R, and Wu, X. Magnetic penetration depth in Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.51.9193.
Ulm, E R, Kim, J, Lemberger, T R, Foltyn, S R, & Wu, X. Magnetic penetration depth in Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films. United States. https://doi.org/10.1103/PhysRevB.51.9193
Ulm, E R, Kim, J, Lemberger, T R, Foltyn, S R, and Wu, X. Sat . "Magnetic penetration depth in Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films". United States. https://doi.org/10.1103/PhysRevB.51.9193.
@article{osti_26054,
title = {Magnetic penetration depth in Ni- and Zn-doped YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films},
author = {Ulm, E R and Kim, J and Lemberger, T R and Foltyn, S R and Wu, X},
abstractNote = {The penetration depth {lambda}({ital T}) in YBa{sub 2}(Cu{sub 1{minus}{ital x}}{ital M}{sub {ital x}}){sub 3}O{sub 7} films, with {ital M}=Ni or Zn and nominal concentrations, 0.02{le}{ital x}{le}0.06, is obtained from the mutual inductance of coaxial coils on opposite sides of the films. Both Ni and Zn increase {lambda}(0) very rapidly, such that the superfluid density, {ital n}{sub {ital s}}(0){proportional_to}{lambda}{sup {minus}2}(0), decreases by a factor of 2 for each percent of dopant. The rapid increase in {lambda}(0) implies that disorder fills in the superconducting density of states at low energy, so that {ital N}{sub {ital S}}(0) is roughly 80--95 % of the normal-state density of states. An analytic {ital d}-wave theory, valid at {ital T}=0, finds that {lambda}(0) increases rapidly with disorder, but not as rapidly as observed. It is striking that the dependence of {lambda}({ital T}/{ital T}{sub {ital c}}) on {ital T}/{ital T}{sub {ital c}} does not change significantly as {ital x} increases from 2% to 6%, although it is different from undoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films. An {ital ad} {ital hoc} phenomenological model finds that one should expect this result. Finally, the values of {ital N}{sub {ital S}}(0) deduced from {lambda} are somewhat larger than values deduced from specific-heat measurements on Zn-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, which also indicate increasing gaplessness with doping.},
doi = {10.1103/PhysRevB.51.9193},
url = {https://www.osti.gov/biblio/26054}, journal = {Physical Review, B: Condensed Matter},
number = 14,
volume = 51,
place = {United States},
year = {1995},
month = {4}
}