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Title: Evolution of spin phonon coupling by substituting Cd for Zn in the frustrated spinel ZnCr{sub 2}Se{sub 4}

Abstract

Frustration makes a tremendous amount of degenerate ground states which provides no energy scale of its own. Any perturbation has to be considered strong and fascinating phenomena may be emergent upon relieving of frustration. Here, we report the evolution of spin phonon coupling in the frustrated spinel system Zn{sub 1−x}Cd{sub x}Cr{sub 2}Se{sub 4} (0 ≤ x ≤ 1) from magnetization, specific heat and thermal conductivity. Our results give clear evidences that the spin-orientated structural transitions decay rapidly as x going from 0 to 0.4 while the correlations between spin and lattice degrees of freedom for 0.6 ≤ x ≤ 1 become weak and can be explained in terms of the traditional magnetostriction effect. In addition, for 0 ≤ x ≤ 0.4 thermal carriers reveal strong scattering from spin fluctuations in the vicinity of T{sub N} owing to strong frustration, in stark contrast with those for 0.6 ≤ x ≤ 1 where traditional phonon-like heat conduction behaviors are observed. Moreover, it is shown that a moderate applied magnetic field can drive readily the fluctuations-scattered thermal conductivity toward traditional phonon-like one as observed in CdCr{sub 2}Se{sub 4}, reaching about 30% for x = 0.4 at 25 K in 1 T. Such strongmore » field-sensitive effects may introduce new promising functionalities for potential applications.« less

Authors:
 [1];  [1]
  1. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22611766
Resource Type:
Journal Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2158-3226
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM ADDITIONS; CARRIERS; CHROMIUM COMPOUNDS; DISTURBANCES; FLUCTUATIONS; GROUND STATES; MAGNETIC FIELDS; MAGNETIZATION; MAGNETOSTRICTION; PERTURBATION THEORY; SCATTERING; SELENIUM COMPOUNDS; SPECIFIC HEAT; SPIN; SPINELS; TERNARY ALLOY SYSTEMS; THERMAL CONDUCTION; THERMAL CONDUCTIVITY; ZINC COMPOUNDS

Citation Formats

Chen, Xuliang, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Yang, Zhaorong, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. Evolution of spin phonon coupling by substituting Cd for Zn in the frustrated spinel ZnCr{sub 2}Se{sub 4}. United States: N. p., 2016. Web. doi:10.1063/1.4943762.
Chen, Xuliang, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Yang, Zhaorong, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, & Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. Evolution of spin phonon coupling by substituting Cd for Zn in the frustrated spinel ZnCr{sub 2}Se{sub 4}. United States. doi:10.1063/1.4943762.
Chen, Xuliang, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Yang, Zhaorong, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093. Sun . "Evolution of spin phonon coupling by substituting Cd for Zn in the frustrated spinel ZnCr{sub 2}Se{sub 4}". United States. doi:10.1063/1.4943762.
@article{osti_22611766,
title = {Evolution of spin phonon coupling by substituting Cd for Zn in the frustrated spinel ZnCr{sub 2}Se{sub 4}},
author = {Chen, Xuliang and Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 and Yang, Zhaorong and Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093},
abstractNote = {Frustration makes a tremendous amount of degenerate ground states which provides no energy scale of its own. Any perturbation has to be considered strong and fascinating phenomena may be emergent upon relieving of frustration. Here, we report the evolution of spin phonon coupling in the frustrated spinel system Zn{sub 1−x}Cd{sub x}Cr{sub 2}Se{sub 4} (0 ≤ x ≤ 1) from magnetization, specific heat and thermal conductivity. Our results give clear evidences that the spin-orientated structural transitions decay rapidly as x going from 0 to 0.4 while the correlations between spin and lattice degrees of freedom for 0.6 ≤ x ≤ 1 become weak and can be explained in terms of the traditional magnetostriction effect. In addition, for 0 ≤ x ≤ 0.4 thermal carriers reveal strong scattering from spin fluctuations in the vicinity of T{sub N} owing to strong frustration, in stark contrast with those for 0.6 ≤ x ≤ 1 where traditional phonon-like heat conduction behaviors are observed. Moreover, it is shown that a moderate applied magnetic field can drive readily the fluctuations-scattered thermal conductivity toward traditional phonon-like one as observed in CdCr{sub 2}Se{sub 4}, reaching about 30% for x = 0.4 at 25 K in 1 T. Such strong field-sensitive effects may introduce new promising functionalities for potential applications.},
doi = {10.1063/1.4943762},
journal = {AIP Advances},
issn = {2158-3226},
number = 5,
volume = 6,
place = {United States},
year = {2016},
month = {5}
}