DOI: 10.1126/science.250.4986.1390. Oxygen Isotope Effect and Structural Phase Transitions in La <sub>2</sub> CuO <sub>4</sub> -Based Superconductors

Oxygen Isotope Effect and Structural Phase Transitions in La 2 CuO 4 -Based Superconductors

10.1126/science.250.4986.1390

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

The oxygen isotope effect on the superconducting transition temperature (α o ) varies as a function of x in La 2- x Sr x CuO 4 and La 2- x Ba x CuO 4 , with the maximum α o values (α o ≥ 0.5) found for x near 0.12. This unusual x dependence implies that the isotope effect is influenced by proximity to the Abma → P4 2 /ncm structural phase transition in these systems. Synchrotron x-ray diffraction measurements reveal little change in lattice parameters or orthorhombicity due to isotope exchange in strontium-doped materials where α o > 0.5, eliminating static structural distortion as a cause of the large isotope effects. The anomalous behavior of α o in both strontium- and barium-doped materials, in combination with the previously discovered Abma → P4 2 /ncm structural phase-transition in La 1.88 Ba 0.12 CuO 4 , suggests that an electronic contribution to the lattice instability is present and maximizes at ∼1/8 hole per copper atom. These observations indicate a close connection between hole doping of the Cu-O sheets, tilting instabilities of the CuO 6 octahedra, and superconductivity in La 2 CuO 4 -based superconductors.

Bibliography

Crawford, M. K., Farneth, W. E., McCarron, E. M., Harlow, R. L., & Moudden, A. H. (1990). Oxygen Isotope Effect and Structural Phase Transitions in La 2 CuO 4 -Based Superconductors. Science, 250(4986), 1390â1394.

Authors 5

M. K. Crawford (first)
W. E. Farneth (additional)
E. M. McCarron (additional)
R. L. Harlow (additional)
A. H. Moudden (additional)

References 30 Referenced 155

AXE, J.D., STRUCTURAL PHASE-TRANSFORMATIONS AND SUPERCONDUCTIVITY IN LA2-XBAXCUO4, PHYSICAL REVIEW LETTERS 62: 2751 (1989). (10.1103/PhysRevLett.62.2751) / PHYSICAL REVIEW LETTERS (1989)
BARDEEN, J, THEORY OF SUPERCONDUCTIVITY, PHYSICAL REVIEW 108: 1175 (1957). (10.1103/PhysRev.108.1175) / PHYSICAL REVIEW (1957)
BARISIC, S, ELECTRON MECHANISM FOR THE STRUCTURAL PHASE-TRANSITIONS IN LA2-XBAXCUO4, SOLID STATE COMMUNICATIONS 74: 367 (1990). (10.1016/0038-1098(90)90504-5) / SOLID STATE COMMUNICATIONS (1990)
BATLOGG, B, NONZERO ISOTOPE EFFECT IN LA1.85SR0.15CUO4, PHYSICAL REVIEW LETTERS 59: 912 (1987). (10.1103/PhysRevLett.59.912) / PHYSICAL REVIEW LETTERS (1987)
BATLOGG, B, DENSITY OF STATES AND ISOTOPE EFFECT IN BIO SUPERCONDUCTORS - EVIDENCE FOR NONPHONON MECHANISM, PHYSICAL REVIEW LETTERS 61: 1670 (1988). (10.1103/PhysRevLett.61.1670) / PHYSICAL REVIEW LETTERS (1988)
BIRGENEAU, R.J., SOFT-PHONON BEHAVIOR AND TRANSPORT IN SINGLE-CRYSTAL LA2CUO4, PHYSICAL REVIEW LETTERS 59: 1329 (1987). (10.1103/PhysRevLett.59.1329) / PHYSICAL REVIEW LETTERS (1987)
BONI, P, LATTICE INSTABILITY AND SOFT PHONONS IN SINGLE-CRYSTAL LA2-XSRXCUO4, PHYSICAL REVIEW B 38: 185 (1988). (10.1103/PhysRevB.38.185) / PHYSICAL REVIEW B (1988)
CAMPUZANO, J.C., FERMI SURFACES OF YBA2CU3O6.9 AS SEEN BY ANGLE-RESOLVED PHOTOEMISSION, PHYSICAL REVIEW LETTERS 64: 2308 (1990). (10.1103/PhysRevLett.64.2308) / PHYSICAL REVIEW LETTERS (1990)
COHEN, R.E., 1ST-PRINCIPLES PHONON CALCULATIONS FOR LA2CUO4, PHYSICAL REVIEW LETTERS 62: 831 (1989). (10.1103/PhysRevLett.62.831) / PHYSICAL REVIEW LETTERS (1989)
COX, D.E., ACQUISITION OF POWDER DIFFRACTION DATA WITH SYNCHROTRON RADIATION, AUSTRALIAN JOURNAL OF PHYSICS 41: 117 (1988). (10.1071/PH880117) / AUSTRALIAN JOURNAL OF PHYSICS (1988)
CRAWFORD, M.K., ANOMALOUS OXYGEN ISOTOPE EFFECT IN LA2-XSRXCUO4, PHYSICAL REVIEW B 41: 282 (1990). (10.1103/PhysRevB.41.282) / PHYSICAL REVIEW B (1990)
FALTENS, T.A., OBSERVATION OF AN OXYGEN ISOTOPE SHIFT IN THE SUPERCONDUCTING TRANSITION-TEMPERATURE OF LA1.85SR0.15CUO4, PHYSICAL REVIEW LETTERS 59: 915 (1987). (10.1103/PhysRevLett.59.915) / PHYSICAL REVIEW LETTERS (1987)
FISHER, D.S., ZERO-POINT MOTION AND THE ISOTOPE EFFECT IN OXIDE SUPERCONDUCTORS, PHYSICAL REVIEW LETTERS 61: 482 (1988). (10.1103/PhysRevLett.61.482) / PHYSICAL REVIEW LETTERS (1988)
FLEMING, R.M., TEMPERATURE AND COMPOSITION DEPENDENCE OF THE TETRAGONAL-ORTHORHOMBIC DISTORTION IN LA2-XSRXCUO4-DELTA, PHYSICAL REVIEW B 35: 7191 (1987). (10.1103/PhysRevB.35.7191) / PHYSICAL REVIEW B (1987)
HATCH, D.M., PHASE-TRANSITIONS IN THE PEROVSKITE-LIKE A2BX4 STRUCTURE, PHYSICAL REVIEW B 39: 9282 (1989). (10.1103/PhysRevB.39.9282) / PHYSICAL REVIEW B (1989)
HINKS, D.G., THE OXYGEN ISOTOPE EFFECT IN BA0.625K0.375BIO3, NATURE 335: 419 (1988). (10.1038/335419a0) / NATURE (1988)
HOEN, S, OXYGEN ISOTOPE STUDY OF YBA2CU3O7, PHYSICAL REVIEW B 39: 2269 (1989). (10.1103/PhysRevB.39.2269) / PHYSICAL REVIEW B (1989)
LANDER, G.H., STRUCTURAL AND MAGNETIZATION DENSITY STUDIES OF LA2NIO4, PHYSICAL REVIEW B 40: 4463 (1989). (10.1103/PhysRevB.40.4463) / PHYSICAL REVIEW B (1989)
MAXWELL, E, ISOTOPE EFFECT IN THE SUPERCONDUCTIVITY OF MERCURY, PHYSICAL REVIEW 78: 477 (1950). / PHYSICAL REVIEW (1950)
MOODENBAUGH, A.R., SUPERCONDUCTING PROPERTIES OF LA2-XBAXCUO4, PHYSICAL REVIEW B 38: 4596 (1988). (10.1103/PhysRevB.38.4596) / PHYSICAL REVIEW B (1988)
OKAJIMA, Y, REDUCTION OF THE ELECTRONIC COEFFICIENT OF THE SPECIFIC-HEAT AROUND X=0.065 IN (LA1-XBAX)2CUO4, SOLID STATE COMMUNICATIONS 74: 767 (1990). (10.1016/0038-1098(90)90932-2) / SOLID STATE COMMUNICATIONS (1990)
REYNOLDS, C.A., SUPERCONDUCTIVITY OF ISOTOPES OF MERCURY, PHYSICAL REVIEW 78: 487 (1950). (10.1103/PhysRev.78.487) / PHYSICAL REVIEW (1950)
Rice, D. E., Physical Review B 42: 8787 (1990). (10.1103/PhysRevB.42.8787) / Physical Review B (1990)
SERA, M, TRANSPORT AND MAGNETIC-ANOMALIES AT THE STRUCTURAL TRANSITION TO THE NEW LOW-TEMPERATURE PHASE IN LA2-XBAXCUO4, SOLID STATE COMMUNICATIONS 69: 851 (1989). (10.1016/0038-1098(89)90278-0) / SOLID STATE COMMUNICATIONS (1989)
SHANNON, R.D., REVISED EFFECTIVE IONIC-RADII AND SYSTEMATIC STUDIES OF INTERATOMIC DISTANCES IN HALIDES AND CHALCOGENIDES, ACTA CRYSTALLOGRAPHICA SECTION A 32: 751 (1976). (10.1107/S0567739476001551) / ACTA CRYSTALLOGRAPHICA SECTION A (1976)
TAKAGI, H, SUPERCONDUCTOR-TO-NONSUPERCONDUCTOR TRANSITION IN (LA1-XSRX)2CUO4 AS INVESTIGATED BY TRANSPORT AND MAGNETIC MEASUREMENTS, PHYSICAL REVIEW B 40: 2254 (1989). (10.1103/PhysRevB.40.2254) / PHYSICAL REVIEW B (1989)
TANAHASHI, N, THE STRONTIUM CONTENT DEPENDENCE OF PRESSURE EFFECT IN (LA1-XSRX)2CUO4, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 28: L762 (1989). (10.1143/JJAP.28.L762) / JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS (1989)
THURSTON, T.R., NEUTRON-SCATTERING STUDY OF SOFT OPTICAL PHONONS IN LA2-XSRXCUO4-Y, PHYSICAL REVIEW B 39: 4327 (1989). / PHYSICAL REVIEW B (1989)
YAMADA, K, SUCCESSIVE ANTIFERROMAGNETIC PHASE-TRANSITIONS IN SINGLE-CRYSTAL LA2COO4, PHYSICAL REVIEW B 39: 2336 (1989). (10.1103/PhysRevB.39.2336) / PHYSICAL REVIEW B (1989)
YAMADA, N, PRESSURE EFFECT ON THE LOW-TEMPERATURE TETRAGONAL PHASE AND THE SUPERCONDUCTIVITY IN (LA1-XBAX)2CUO4, SOLID STATE COMMUNICATIONS 70: 1151 (1989). (10.1016/0038-1098(89)90754-0) / SOLID STATE COMMUNICATIONS (1989)

Dates

Type	When
Created	18 years, 10 months ago (Oct. 5, 2006, 6:10 p.m.)
Deposited	1 year, 7 months ago (Jan. 12, 2024, 10:16 a.m.)
Indexed	1 month, 4 weeks ago (July 4, 2025, 8:46 a.m.)
Issued	34 years, 8 months ago (Dec. 7, 1990)
Published	34 years, 8 months ago (Dec. 7, 1990)
Published Print	34 years, 8 months ago (Dec. 7, 1990)

Funders 0

None

BibTeX

@article{Crawford_1990, title={Oxygen Isotope Effect and Structural Phase Transitions in La 2 CuO 4 -Based Superconductors}, volume={250}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.250.4986.1390}, DOI={10.1126/science.250.4986.1390}, number={4986}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Crawford, M. K. and Farneth, W. E. and McCarron, E. M. and Harlow, R. L. and Moudden, A. H.}, year={1990}, month=dec, pages={1390–1394} }

JSON

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