Beyer, A. D. and Zapf, V. S. and Yang, H. and Fabris, F. and Park, M. S. and Kim, K. H. and Lee, S.-I. and Yeh, N.-C. (2007) Macroscopic evidence for quantum criticality and field-induced quantum fluctuations in cuprate superconductors. Physical Review B, 76 (14). Art. No. 140506(R). ISSN 1098-0121 http://resolver.caltech.edu/CaltechAUTHORS:BEYprb07
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We present macroscopic experimental evidence for field-induced microscopic quantum fluctuations in different hole- and electron-type cuprate superconductors with varying doping levels and numbers of CuO2 layers per unit cell. The significant suppression of the zero-temperature in-plane magnetic irreversibility field relative to the paramagnetic field in all cuprate superconductors suggests strong quantum fluctuations due to the proximity of the cuprates to quantum criticality.
|Additional Information:||©2007 The American Physical Society. (Received 15 January 2007; revised 7 October 2007; published 25 October 2007) Research at Caltech was supported by NSF Grant No. DMR-0405088 and through the NHMFL. The SQUID data were taken at the Beckman Institute at Caltech. Work at Pohang University was supported by the Ministry of Science and Technology of Korea. The authors gratefully acknowledge Kazuyasu Tokiwa and Tsuneo Watanabe at the Tokyo University of Science for providing the HgBa2Ca4Cu5Ox (Hg-1245) samples.|
|Subject Keywords:||copper compounds; doping; fluctuations in superconductors; high-temperature superconductors|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||26 Oct 2007|
|Last Modified:||26 Dec 2012 09:45|
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