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Title: Paramagnons in heavy-electron systems

Abstract

Paramagnons in heavy-electron systems are theoretically examined. First, local spin fluctuations are fully included in the best single-site approximation. A local Kondo temperature is uniquely defined to show a characteristic energy scale of local spin fluctuations. Secondly, paramagnons are included perturbatively. Such a theory is applied to analyze the specific-heat data of heavy-electron compounds such as UAl{sub 2}, UPt{sub 3}, and CeSi{sub 1.85}, where anomalous {ital T}{sup 3}ln{ital T} terms are observed at low temperatures {ital T}{lt}10 K. It is argued that not only paramagnons but also local spin fluctuations are responsible for the low-temperature specific heat and that paramagnons are responsible for the anomalous {ital T}{sup 3}ln{ital T} terms.

Authors:
 [1]
  1. Department of Physics, Hokkaido University, Sapporo 060 (Japan)
Publication Date:
OSTI Identifier:
5238372
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (United States)
Additional Journal Information:
Journal Volume: 44:13; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; FLUCTUATIONS; MAGNONS; CERIUM SILICIDES; PLATINUM BASE ALLOYS; URANIUM ALLOYS; KONDO EFFECT; PARAMAGNETISM; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; ULTRALOW TEMPERATURE; ACTINIDE ALLOYS; ALLOYS; ALUMINIUM ALLOYS; CERIUM COMPOUNDS; MAGNETISM; PHYSICAL PROPERTIES; PLATINUM ALLOYS; PLATINUM METAL ALLOYS; QUASI PARTICLES; RARE EARTH COMPOUNDS; SILICIDES; SILICON COMPOUNDS; THERMODYNAMIC PROPERTIES; VARIATIONS; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Ohkawa, F J. Paramagnons in heavy-electron systems. United States: N. p., 1991. Web. doi:10.1103/PhysRevB.44.6812.
Ohkawa, F J. Paramagnons in heavy-electron systems. United States. https://doi.org/10.1103/PhysRevB.44.6812
Ohkawa, F J. Tue . "Paramagnons in heavy-electron systems". United States. https://doi.org/10.1103/PhysRevB.44.6812.
@article{osti_5238372,
title = {Paramagnons in heavy-electron systems},
author = {Ohkawa, F J},
abstractNote = {Paramagnons in heavy-electron systems are theoretically examined. First, local spin fluctuations are fully included in the best single-site approximation. A local Kondo temperature is uniquely defined to show a characteristic energy scale of local spin fluctuations. Secondly, paramagnons are included perturbatively. Such a theory is applied to analyze the specific-heat data of heavy-electron compounds such as UAl{sub 2}, UPt{sub 3}, and CeSi{sub 1.85}, where anomalous {ital T}{sup 3}ln{ital T} terms are observed at low temperatures {ital T}{lt}10 K. It is argued that not only paramagnons but also local spin fluctuations are responsible for the low-temperature specific heat and that paramagnons are responsible for the anomalous {ital T}{sup 3}ln{ital T} terms.},
doi = {10.1103/PhysRevB.44.6812},
url = {https://www.osti.gov/biblio/5238372}, journal = {Physical Review, B: Condensed Matter; (United States)},
issn = {0163-1829},
number = ,
volume = 44:13,
place = {United States},
year = {1991},
month = {10}
}