1 / 13

Zurab Guguchia Physik-Institut der Universität Zürich, Winterthurerstrasse 190,

neutrons. muons. photons. Tuning the static spin-stripe phase and superconductivity in La 2- x Ba x CuO 4 ( x = 1/8) by hydrostatic pressure. Zurab Guguchia Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland. Tbilisi State University.

aglaia
Download Presentation

Zurab Guguchia Physik-Institut der Universität Zürich, Winterthurerstrasse 190,

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. neutrons muons photons Tuning the static spin-stripe phase and superconductivity in La2-xBaxCuO4 (x = 1/8) by hydrostatic pressure Zurab Guguchia Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

  2. Tbilisi State University Thank you! University of Zürich in collaboration with: • Tbilisi State University, Georgia • Paul Scherrer Institute (PSI), Switzerland

  3. 1/8 problem THTT→LTO ≈ 200 K TLTO→LTT ≈ 50 K 0.11 <x≤ 0.13 Superconductivity in La2-xBaxCuO4 LTO A. R. Moodenbaugh et. al., Phys. Rev. B 38, 4596 (1988). J. D. Axe et. al., Phys. Rev. Lett. 62, 2751 (1989). M. Hücker et. al., Phys. Rev. B 83, 104506 (2011).

  4. Stripe order in cuprate superconductors La1.48Nd0.4Sr0.12CuO4 J.M. Tranquada et. al., Nature (London) 375, 561 (1995). K.A. Moler, Nature468, 643-644 (2010). J. Zaanen, PRB 40, 7391 (1989).

  5. Stripe order in La1.875Ba0.125CuO4 High-pressure studies on La1.875Ba0.125CuO4 have suggested that Tc of the system is restored under high pressure. Tso vs hydrostatic pressure? M. Hücker et. al., Phys. Rev. B 83, 104506 (2011).

  6. Diamond anvil cell for high-pressure measurements Superconducting properties of La1.875Ba0.125CuO4

  7. Muon-spin rotation (μSR) technique TRIUMF http://neutron.magnet.fsu.edu/muon_relax.html

  8. time (ms) μSR in magnetic materials homogeneous inhomogeneous time (ms) amplitude → magnetic volume fractionfrequency → average local magnetic field damping → magnetic field distribution / magnetic fluctuations Courtesy of H. Luetkens

  9. High pressure µSR experiments on La1.875Ba0.125CuO4 D. Andreica, Ph.D. thesis, IPP/ETH-Zürich, (2001).

  10. High pressure µSR experiments on La1.875Ba0.125CuO4

  11. Phase diagrams

  12. Conclusions • The interplay between magnetism and superconductivity was studied in La1.875Ba0.125CuO4as a function of pressure up to p ≈ 2.25GPa. • At p = 0 static spin-stripe order is stabilized below Tso = 32 K, occupies nearly the whole sample volume and superconductivity exists in a minor part of the sample only. • The ordered moment size and the magnetic ordering temperature does not change upon application of pressure. However, the volume fraction of spin-stripe order significantly decreases with increasing p. • At the same time by the application of pressure SC phase volume increases proportionally to the non-magnetic volume fraction. • These results indicate that in La1.875Ba0.125CuO4 magnetism and superconductivity occur in mutually exclusive spatial regions.

  13. Thank you very much for your attention!

More Related