Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 71: Correlated Electrons: Poster Session
TT 71.45: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
Influence of Ti deficiency on the magnetic properties in Yb2Ti2O7 — •Marcel Naumann1, Elizabeth L. Green1, Sergei Zherlitsyn1, Salim Erfanifam1, Shadi Yasin1, Joachim Wosnitza1, Andrej Maljuk2, Christian G. F. Blum2, Rhea Kappenberger2, Jan Trinckauf2, Bernd Büchner2, Sabine Wurmehl2, Rajib Sarkar3, Sirko Kamusella3, Philipp Materne3, Hans-Henning Klauss3, Hubertus Luetkens4, and Chris Baines4 — 1Hochfeld-Magnetlabor Dresden, HZDR, 01328 Dresden, Germany — 2IFW, 01171 Dresden, Germany — 3TU Dresden, 01069 Dresden, Germany — 4PSI, 5232 Villigen, Switzerland
Frustrated spin systems with pyrochlore lattice exhibit a wide range of physical phenomena such as magnetic monopoles and residual entropies. In particular, Yb2Ti2O7 has attracted attention in recent years, also due to the sample dependence of its ground state. While some works suggest a ferromagnetic ground state others see no long-range magnetic ordering or spin freezing whatsoever.
We investigated two different samples grown under similar growth conditions using heat-capacity, ultra-sound, and µSR measurements. While one sample showed a crossover around 240 mK,the other exhibited no evidence of long-range magnetic order down to 15 mK. The results of subsequent x-ray and EDX measurements indicate a strong influence of Ti deficiency on the low-temperature magnetic properties. This offers a new tuning parameter for the ongoing search for a quantum spin liquid.