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306 Handbook on the Physics and Chemistry of Rare Earths can the reduced holmium concentration (eg, x1⁄40.167) and random dipolar interactions create a canonical Ising SG? The efforts are continuing up to the present with the answer still being controversial. J€onsson et al. (2007) claim the absence of a conventional SG transition, based on low temperature SQUID measurements. In contrast (Ancona-Torres et al., 2008) using low field, low-frequency nonlinear susceptibility established the SG transition. Other experiments are divided between a canonical SG phase (Quilliam et al., 2012), and glassy low-temperature dynamics (Rodriguez et al., 2010). Regardless of the exact SG state, the behavior of diluted Li(Y1xHox)F4 in a transverse field H? was studied, motivated by theoretical predictions of Read et al. (1995) and Sachdev (2011). Initially, Wu et al. (1993) investigated the nonlinear susceptibility of the x1⁄40.167 compound to low temperatures and high fields, thereby driving the SG temperature TSG(H?) to near zero as shown in Fig. 6. As 25 mK was approached by varying H?, the nonlinear 3 2 LiHo0.167Y0.833F4 T (mK) 98 82 66 1 25 0 15 10 5 0 FIG. 6 Upper panel: Nonlinear ac-susceptibility as function of H? at various temperatures. Note how the originally sharp classical SG transition is smeared into a broad peak as the QCP is reached. Lower panel: Imaginary part (absorption) of the linear ac-susceptibility as above. Note how the absorption decreases as the H? is scanned though the critical temperature both classical and quantum. This behavior indicates dynamical effects around the transitions at the one frequency (1.5 Hz) of measurement. According to Wu, W., Bitko, D., Rosenbaum, T.F., Aeppli, G., 1993. Quenching of the nonlinear susceptibility at a T1⁄40 spin glass transition. Phys. Rev. Lett. 71 (12), 1919. 0 10 20 H^ (kOe) f = 1.5 Hz c 12 (emu / mol Ho) c 3¢ (10–4 emu / mol Ho Oe2)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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