期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 73, 期 10, 页码 2642-2645出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.2642
关键词
TlCuCl3; KCuCl3; Tl1-xKxCuCl3; spin gap; field-induced magnetic ordering; spin triplet; magnon; magnon; Bose-Einstein condensation; randomness; localization; Bose glass
The effect of exchange randomness on field-induced magnetic ordering was investigated through specific heat measurements in Tl1-xKxCuCl3 with x less than or equal to 0.22. The isostructural parent compounds TlCuCl3 and KCuCl3 are coupled spin dimer systems with a gapped ground state and their field-induced antiferromagnetic ordering is described by the Bose-Einstein condensation (BEC) of spin triplets. Well-defined field-induced phase transitions were observed in Tl1-xKxCuCl3. The critical exponent phi of the phase boundary defined by T(H) proportional to (H - H-c)(1/phi) is reevaluated in TlCuCl3 as phi = 1.67 +/- 0.07, which is close to phi(BEC) = 3/2 derived from the magnon BEC theory. For x not equal 0, the exponent phi decreases systematically with x. The phase boundary observed below 2 K for x > 0.1 approximates a linear function of temperature T. In the low-field region for H < H-c no magnetic ordering is observed despite finite susceptibility. These properties are discussed in connection with the Bose glass phase argued by Fisher et al.
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