Title: Long range order and two-fluid behavior in heavy electron materials

Abstract

The heavy electron Kondo liquid is an emergent state of condensed matter that displays universal behavior independent of material details. Properties of the heavy electron liquid are best probed by NMR Knight shift measurements, which provide a direct measure of the behavior of the heavy electron liquid that emerges below the Kondo lattice coherence temperature as the lattice of local moments hybridizes with the background conduction electrons. Because the transfer of spectral weight between the localized and itinerant electronic degrees of freedom is gradual, the Kondo liquid typically coexists with the local moment component until the material orders at low temperatures. The two-fluid formula captures this behavior in a broad range of materials in the paramagnetic state. In order to investigate two-fluid behavior and the onset and physical origin of different long range ordered ground states in heavy electron materials, we have extended Knight shift measurements to URu₂Si₂, CeIrIn₅, and CeRhIn₅. In CeRhIn₅ we find that the antiferromagnetic order is preceded by a relocalization of the Kondo liquid, providing independent evidence for a local moment origin of antiferromagnetism. In URu₂Si₂ the hidden order is shown to emerge directly from the Kondo liquid and so is not associated with local momentmore » physics. Lastly, our results imply that the nature of the ground state is strongly coupled with the hybridization in the Kondo lattice in agreement with phase diagram proposed by Yang and Pines.« less

Authors:

Shirer, Kent R. ^[1]; Shockley, Abigail C. ^[1]; Dioguardi, Adam P. ^[1]; Crocker, John ^[1]; Lin, Ching H. ^[1]; apRoberts-Warren, Nicholas ^[1]; Nisson, David M. ^[1]; Klavins, Peter ^[1]; Cooley, Jason C. ^[2]; Yang, Yi -feng ^[3]; Curro, Nicholas J. ^[1]

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+ Show Author Affiliations

1. Univ. of California, Davis, CA (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Chinese Academy of Sciences (CAS), Beijing (China)

Publication Date:

Mon Sep 24 00:00:00 EDT 2012

Research Org.:

Univ. of California, Davis, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1329379

Grant/Contract Number:  

FG52-09NA29464

Resource Type:

Accepted Manuscript

Journal Name:

Proceedings of the National Academy of Sciences of the United States of America

Additional Journal Information:

Journal Volume: 109; Journal Issue: 45; Journal ID: ISSN 0027-8424

Publisher:

National Academy of Sciences, Washington, DC (United States)

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; nuclear magnetic resonance; heavy fermion; hyperfine couplings