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Title: Gradual pressure-induced enhancement of magnon excitations in CeCoSi

Abstract

CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below T N = 8.8 K , while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of ~ 40 K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only m Ce = 0.37 ( 6 ) μ B . Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.

Authors:
; ORCiD logo; ; ; ORCiD logo; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG)
OSTI Identifier:
1633700
Alternate Identifier(s):
OSTI ID: 1649118
Grant/Contract Number:  
AC05-00OR22725; GE 602/4-1
Resource Type:
Published Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Name: Physical Review B Journal Volume: 101 Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Antiferromagnetism; specific heat; spin dynamics; antiferromagnets; heavy-fermion systems; metals; neutron diffraction; time-of-flight neutron spectroscopy

Citation Formats

Nikitin, S. E., Franco, D. G., Kwon, J., Bewley, R., Podlesnyak, A., Hoser, A., Koza, M. M., Geibel, C., and Stockert, O. Gradual pressure-induced enhancement of magnon excitations in CeCoSi. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.214426.
Nikitin, S. E., Franco, D. G., Kwon, J., Bewley, R., Podlesnyak, A., Hoser, A., Koza, M. M., Geibel, C., & Stockert, O. Gradual pressure-induced enhancement of magnon excitations in CeCoSi. United States. doi:https://doi.org/10.1103/PhysRevB.101.214426
Nikitin, S. E., Franco, D. G., Kwon, J., Bewley, R., Podlesnyak, A., Hoser, A., Koza, M. M., Geibel, C., and Stockert, O. Wed . "Gradual pressure-induced enhancement of magnon excitations in CeCoSi". United States. doi:https://doi.org/10.1103/PhysRevB.101.214426.
@article{osti_1633700,
title = {Gradual pressure-induced enhancement of magnon excitations in CeCoSi},
author = {Nikitin, S. E. and Franco, D. G. and Kwon, J. and Bewley, R. and Podlesnyak, A. and Hoser, A. and Koza, M. M. and Geibel, C. and Stockert, O.},
abstractNote = {CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below TN=8.8K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of ~40K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only mCe=0.37(6)μB. Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.},
doi = {10.1103/PhysRevB.101.214426},
journal = {Physical Review B},
number = 21,
volume = 101,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevB.101.214426

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