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Dimensionality of superconductivity and vortex dynamics in the infinite-layer cuprate Sr0.9M0.1CuO2 (M=La,Gd)

Zapf, V. S. and Yeh, N.-C. and Beyer, A. D. and Hughes, C. R. and Mielke, C. H. and Harrison, N. and Park, M. S. and Kim, K. H. and Lee, S.-I. (2005) Dimensionality of superconductivity and vortex dynamics in the infinite-layer cuprate Sr0.9M0.1CuO2 (M=La,Gd). Physical Review B, 71 (13). Art. No. 134526. ISSN 1098-0121. doi:10.1103/PhysRevB.71.134526.

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The high magnetic-field phase diagram of the electron-doped infinite layer high-temperature superconducting (high-T-c) compound Sr0.9La0.1CuO2 was probed by means of penetration depth and magnetization measurements in pulsed fields to 60 T. An anisotropy ratio of 8 was detected for the upper critical fields with H parallel (H-c2(ab)) and perpendicular (H-c2(c)) to the CuO2 planes, with H-c2(ab) extrapolating to near the Pauli paramagnetic limit of 160 T. The longer superconducting coherence length than the lattice constant along the c axis indicates that the orbital degrees of freedom of the pairing wave function are three dimensional. By contrast, low-field magnetization and specific heat measurements of Sr0.9Gd0.1CuO2 indicate a coexistence of bulk s-wave superconductivity with large moment Gd paramagnetism close to the CuO2 planes, suggesting a strong confinement of the spin degrees of freedom of the Cooper pair to the CuO2 planes. The region of the magnetic field-temperature phase diagram between H-c2(ab) and the irreversibility line in the magnetization, H-irr(ab), in Sr0.9La0.1CuO2 is anomalously large for an electron-doped high-T-c cuprate. The large reversible region even approaching zero temperature rules out thermal depinning scenarios. The temperature dependence of H-irr(ab) also differs fundamentally from those predicted for the quenched-disorder-induced vortex phase transitions for H parallel to c at low temperatures. Thus, our finding of a strongly suppressed H-irr(ab) relative to H-c2(ab) at low temperatures is suggestive of the existence of additional quantum fluctuations, possibly due to a magnetic-field-induced competing order such as the spin-density wave (SDW).

Item Type:Article
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Yeh, N.-C.0000-0002-1826-419X
Additional Information:© 2005 The American Physical Society. Received 21 April 2004; revised 9 December 2004; published 29 April 2005. This work was supported by the National Science Foundation under Grant No. DMR-0103045 and DMR-0405088, and the National High Magnetic Field Laboratory at Los Alamos, NM. V.Z. acknowledges support by the Caltech Millikan Postdoctoral Fellowship program.
Funding AgencyGrant Number
National High Magnetic Field LaboratoryUNSPECIFIED
Caltech Millikan FellowshipUNSPECIFIED
Subject Keywords:antiferromagnetic order, SR0.9LA0.1CUO2, YBA2CU3O7-DELTA, magnetization, compound, oxygen, state, field
Issue or Number:13
Record Number:CaltechAUTHORS:ZAPprb05
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:879
Deposited By: Tony Diaz
Deposited On:03 Nov 2005
Last Modified:08 Nov 2021 19:05

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