Journal
PHYSICAL REVIEW B
Volume 83, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.020409
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Grants-in-Aid for Scientific Research [23740262] Funding Source: KAKEN
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We report the magnetic-field-induced Bose glass-Bose-Einstein condensate (BEC) transition of triplons in Tl1-xKxCuCl3 and its critical behavior, which were investigated through specific heat and electron spin resonance (ESR) measurements. The field dependence of the BEC transition temperature T-N can be described by the power law [H - H-c] proportional to T-N(phi) near the quantum critical point H-c similar to 3 T. The critical exponent phi tends to reach a value smaller than 1/2 with decreasing fitting window in contrast to phi -> 3/ 2 for the standard BEC in a pure system. At sufficiently low temperatures, the ESR line shape for H similar or equal to H-c is intermediate between Gaussian and Lorentzian functions. This implies the localization of triplons for H < H-c at T = 0.
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