H – T phase diagram of PrOs 4 Sb 12 - PowerPoint PPT Presentation

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H – T phase diagram of PrOs 4 Sb 12
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H – T phase diagram of PrOs 4 Sb 12

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  1. QCP QCP H – T phase diagram of PrOs4Sb12 • HF behavior (m* ~ 50 me) • Nonmagnetic ground state • Unconventional SC (multiband, TRSB, gap nodes) • HFOP:AFQ order – neutron diffraction Kohgiet al., JPSJ (‘03) • SC in vicinity of AFQ QCP? AFQ order Bauer, Frederick, Ho, Zapf, Maple, PRB (‘02); Maple et al., JPSJ (‘02); Ho et al., PRB (‘03)

  2. Kondo effect and multipolar order in PrTr2Al20 (Tr = Ti, V) • Cubic crystal structure w/ atomic cages • G3 non-magnetic doublet g.s. in CEF • Quadrupolar (Q) order, NFL – QKE • PrTi2Al20: FQ order, To = 2.0 K, g ~ 0.1 J/mol-K2, m*/me ~ 16r(T) ~ T2 at low T ⇒ FL SC: Tc = 0.2 K • PrV2Al20: AFQ order, To = 0.6 K,g ~ 0.9 J/mol-K2, m*/me ~ 140r(T) ~ T1/2 at low T ⇒NFL – QKE?; SC: Tc = 0.05 K K. Matsubayashi et al., PRL (’12) A.Sakai, S. Nakatsuji, JPSJ (‘11)

  3. T vs P phase diagram of LnTe3 compounds 1T-TiSe2 Kusmartseva et al., PRL 103, 236401 (2009) Sipos et al., Nature Materials 7, 960 (2008) TaS2 D. A. Zocco, J. J. Hamlin, M. B. Maple, UCSD; J. H. Chu, I. R. Fisher, Stanford