Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.47: Poster

Mittwoch, 14. März 2018, 15:00–19:00, Poster B

Spin liquid behaviour in the disordered double perovskite BaTi_1/2Mn_1/2O₃ — M. R. Cantarino³, •R. Sarkar¹, R.S. De Freitas³, H. Luetkens², C. Baines², R. Lora-Serrano⁴, R.P. Amaral⁴, S. Brauninger¹, V. Grinenko¹, H.-H. Klauss¹, E. C. Andrade⁵, and F. A. Garcia³ — ¹Institute of Solid State and Materials Physics, TU Dresden, D-01062 Dresden, Germany — ²Laboratory for Muon-Spin Spectroscopy, PSI, 5232 Villigen PSI, Switzerland — ³IFUSP, Univ. de São Paulo, 05508-090, São Paulo-SP, Brazil — ⁴Univ. Fed. de Uberândia, Instituto de Física, 38400-902, Uberlrândia-MG, Brazil — ⁵Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, São Carlos, SP, 13560-970, Brazil.

We present bulk susceptibility, heat- capacity and µSR experiments of the disordered double perovskite BaTi_1/2Mn_1/2O₃. Heat capacity investigations down to T=0.1 K and in magnetic fields up to 9 T exhibits a field dependent broad anomaly around T=3−7 K, and no long range ordering. Macroscopic magnetic properties, measured down to T=0.5 K, do not display as well any sign for phase transition. The zero field (ZF) and longitudinal field dependence µ⁺ time spectra shows the absence of any static magnetism down to 20 mK. However, ZF µ⁺ relaxation rate λ display a steep increase in the T interval 1.5<T<10 K and levels up as a constant value indicating a correlated fluctuating ground state. Our experimental data and analysis suggests that BaTi_1/2Mn_1/2O₃ is a suitable candidate to host a spin liquid ground state.