Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe

Abstract Polycrystalline CeGe is investigated by means of DC and AC susceptibility, non-linear DC susceptibility, electrical transport and heat capacity measurements in the low temperature regime. This compound shows two peaks at low magnetic field around T I ~ 10.7 and T II ~ 7.3 K due to antiferro...

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Auteurs principaux:	Karan Singh, K. Mukherjee
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2019
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/0d19bcdb250f42ec90cfd2d943eb26c1
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spelling	oai:doaj.org-article:0d19bcdb250f42ec90cfd2d943eb26c12021-12-02T15:09:35ZPossibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe10.1038/s41598-019-41565-82045-2322https://doaj.org/article/0d19bcdb250f42ec90cfd2d943eb26c12019-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-41565-8https://doaj.org/toc/2045-2322Abstract Polycrystalline CeGe is investigated by means of DC and AC susceptibility, non-linear DC susceptibility, electrical transport and heat capacity measurements in the low temperature regime. This compound shows two peaks at low magnetic field around T I ~ 10.7 and T II ~ 7.3 K due to antiferromagnetic ordering and subsequent spin rearrangement respectively. Investigation of non-linear DC susceptibility reveals a presence of higher order magnetization which results in the development of a new order parameter around T I. This leads to a lowering of symmetry of the magnetic state. The order parameter increases with decreasing temperature and stabilizes around T II. Consequently, the symmetry of the magnetic state is preserved below this transition. Heat capacity and resistivity results indicate the presence of a gap opening around T I on portion of Fermi surface, due to evolution of the Fermi surface. Magnetoresistance behavior and violation of Kohler’s rule suggest that the evolution of Fermi surface changes the symmetry of magnetic state. The observation of new order parameter (which is of second order) is also confirmed from the Landau free energy theory.Karan SinghK. MukherjeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-11 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Karan Singh K. Mukherjee Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
description	Abstract Polycrystalline CeGe is investigated by means of DC and AC susceptibility, non-linear DC susceptibility, electrical transport and heat capacity measurements in the low temperature regime. This compound shows two peaks at low magnetic field around T I ~ 10.7 and T II ~ 7.3 K due to antiferromagnetic ordering and subsequent spin rearrangement respectively. Investigation of non-linear DC susceptibility reveals a presence of higher order magnetization which results in the development of a new order parameter around T I. This leads to a lowering of symmetry of the magnetic state. The order parameter increases with decreasing temperature and stabilizes around T II. Consequently, the symmetry of the magnetic state is preserved below this transition. Heat capacity and resistivity results indicate the presence of a gap opening around T I on portion of Fermi surface, due to evolution of the Fermi surface. Magnetoresistance behavior and violation of Kohler’s rule suggest that the evolution of Fermi surface changes the symmetry of magnetic state. The observation of new order parameter (which is of second order) is also confirmed from the Landau free energy theory.
format	article
author	Karan Singh K. Mukherjee
author_facet	Karan Singh K. Mukherjee
author_sort	Karan Singh
title	Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
title_short	Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
title_full	Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
title_fullStr	Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
title_full_unstemmed	Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe
title_sort	possibility of a new order parameter driven by multipolar moment and fermi surface evolution in cege
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/0d19bcdb250f42ec90cfd2d943eb26c1
work_keys_str_mv	AT karansingh possibilityofaneworderparameterdrivenbymultipolarmomentandfermisurfaceevolutionincege AT kmukherjee possibilityofaneworderparameterdrivenbymultipolarmomentandfermisurfaceevolutionincege
_version_	1718387796574470144

Possibility of a new order parameter driven by multipolar moment and Fermi surface evolution in CeGe

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