Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.33: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Dilatometric measurements of the detwinning process in EuFe₂As₂ — •Ina-Marie Pietsch, Christian Stingl, Hirale S. Jeevan, Jannis Maiwald, Nora Bach, and Philipp Gegenwart — I.Physikalisches Institut, Georg-August Universität, Göttingen, Germany

For the investigation of the anisotropic in-plane behavior of high temperature superconductors we need easy and practicable methods for detwinning single crystals. In our experiments the thermal expansion and magnetostriction has been used to analyze the detwinning process of EuFe₂As₂ in a magnetic field. This technique has the advantage that anisotropic behavior can be studied without applying external stress to the system. Using high-resolution capacitive dilatometry we can detect length changes related to the movement of domains due to an applied magnetic field. We examined the detwinning process for a large temperature range above and below the magnetic ordering transition of Eu spins at 19 K. Strikingly, the field-induced detwinning is permanent upon warming up to the structural transition at 187 K, which allows to investigate the anisotropic properties of the system over a wide temperature range.