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On the Antiferromagnetic Superconductor YbPd\(_2\)Sn: The Case for Local-Moment Quantum Criticality

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Abstract

The extraordinary Heusler compound YbPd\(_2\)Sn is a near-full magnetic moment Yb\(^{+3}\) paramagnet at high temperature, becomes superconducting below \(T_\mathrm{sc}\simeq {2~}\)K, and orders long-range antiferromagnetic at \(T_\mathrm{N}~=~0.2~\)K. \(T_\mathrm{sc}\) is of re-entrant nature for fields between \(0.04\) and \(0.05~\)T. The \(T\rightarrow 0\) superconductivity is quenched in a field of \(0.04~\)T, whereas the field suppression of \(T_\mathrm{N}\) requires upward of \(0.3~\)T. This presents the possibility to study the stability of magnetic order and its \(T_\mathrm{N}\rightarrow 0\) behavior in the normal region of phase space. In this work, we are concerned with critical effects accompanying the suppression of magnetic order in YbPd\(_2\)Sn as a local-moment antiferromagnet, and we formulate a description of the specific heat of YbPd\(_2\)Sn in terms of field-driven quantum criticality.

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Acknowledgments

AMS thanks the Research Committee of UJ and the NRF-SA (2072956) for financial assistance. DB thanks the Research Committee of UJ for a Doctoral Fellowship.

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  1. Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, PO Box 524, Auckland Park, 2006, South Africa

    D. Britz & A. M. Strydom

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  1. D. Britz
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  2. A. M. Strydom
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Correspondence to A. M. Strydom.

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Britz, D., Strydom, A.M. On the Antiferromagnetic Superconductor YbPd\(_2\)Sn: The Case for Local-Moment Quantum Criticality. J Low Temp Phys 179, 62–68 (2015). https://doi.org/10.1007/s10909-014-1225-2

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  • DOI: https://doi.org/10.1007/s10909-014-1225-2

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