Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: CE: Low-dimensional Systems - Materials 3

TT 35.8: Talk

Wednesday, March 16, 2011, 16:00–16:15, HSZ 301

Spin orbit coupling induced phonon anomalies and relevant electronic energy scales in Sr₂IrO₄ — •Mehmet Fatih Cetin^1,2, Peter Lemmens^1,2, Vladimir Gnezdilov^1,3, Dirk Wulferding^1,2, Dirk Menzel¹, Wolfram Brenig^4,2, Tomohiro Takayama⁵, Kei Ohashi⁵, and Hidenori Takagi^5,6 — ¹IPKM, TU-BS, Braunschweig, Germany — ²NTH, Germany — ³ILTPE NAS, Ukraine — ⁴ITP, TU-BS, Braunschweig, Germany — ⁵AM, University of Tokyo, Japan — ⁶RIKEN Advanced Science Institute, Japan

Sr₂IrO₄ is a Mott insulator due to the interplay of strong spin orbit coupling and crystal field interactions. The strong spin orbit interaction is evident in our study via pronounced phonon anomalies and multiphonon scattering. In addition we observe broad high energy modes that are attributed to exchange scattering on a square plane with J_eff=1/2.

Work is supported by DFG, IGSM and NTH School for Contacts in Nanosystems.