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Multiple quantum phase transitions in a heavy fermion antiferromagnet

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arxiv 1308.0294 v1 pith:UNXNSU7Z submitted 2013-08-01 cond-mat.str-el

L. Jiao , H. Q. Yuan , Y. Kohama , E. D. Bauer , J.-X. Zhu , J. Singleton , T. Shang , J. L. Zhang
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Y. Chen H. O. Lee T. Park M. Jaime J. D. Thompson F. Steglich Q. Si
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classification cond-mat.str-el
keywords quantumphaseantiferromagneticfermiheavy-fermionmetalmultipleqcps
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We report measurements of magnetic quantum oscillations and specific heat at low temperatures across a field-induced antiferromagnetic quantum critical point (QCP)(B_{c0}\approx50T) of the heavy-fermion metal CeRhIn_5. A sharp magnetic-field induced Fermi surface reconstruction is observed inside the antiferromagnetic phase. Our results demonstrate multiple classes of QCPs in the field-pressure phase diagram of this heavy-fermion metal, pointing to a universal description of QCPs. They also suggest that robust superconductivity is promoted by unconventional quantum criticality of a fluctuating Fermi surface.

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