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Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi 3 .

Authors :
Valenta J
Naka T
Diviš M
Vališka M
Proschek P
Vlášková K
Klicpera M
Prokleška J
Custers J
Prchal J
Source :
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2020 Jul 23; Vol. 32 (42). Date of Electronic Publication: 2020 Jul 23.
Publication Year :
2020

Abstract

There is an ongoing dispute in the community about the absence of a magnetic quantum critical point (QCP) in the noncentrosymmetric heavy fermion compound CeRhSi <subscript>3</subscript> . In order to explore this question we prepared single crystals of CeRh(Si <subscript>1- x </subscript> Ge <subscript> x </subscript> ) <subscript>3</subscript> with x = 0.05 and 0.15 and determined the temperature-pressure ( T - p ) phase diagram by means of measurements of the electrical resistivity. The substitution of isoelectronic but large Ge enforces a lattice volume increase resulting in a weakening of the Kondo interaction. As a result, the x = 0.05 and x = 0.15 compound exhibit a transition into the antiferromagnetic (AFM) at higher temperatures being T <subscript>N</subscript> = 4.7 K and T <subscript>N1</subscript> = 19.7 K, respectively. Application of pressure suppresses T <subscript>N</subscript> ( T <subscript>N1</subscript> ) monotonically and pressure induced superconductivity is observed in both Ge-substituted compounds above p ⩾ 2.16 GPa ( x = 0.05) and p ⩾ 2.93 GPa ( x = 0.15). Extrapolation of T <subscript>N</subscript> ( p ) → 0 of CeRh(Si <subscript>0.95</subscript> Ge <subscript>0.05</subscript> ) <subscript>3</subscript> yields a critical pressure of p <subscript>c</subscript> ≈ 3.4 GPa (in CeRh(Si <subscript>0.85</subscript> Ge <subscript>0.15</subscript> ) <subscript>3</subscript>   p <subscript>c</subscript> ≈ 3.5 GPa) pointing to the presence of an AFM QCP located deep inside the superconducting state.<br /> (© 2020 IOP Publishing Ltd.)

Details

Language :
English
ISSN :
1361-648X
Volume :
32
Issue :
42
Database :
MEDLINE
Journal :
Journal of physics. Condensed matter : an Institute of Physics journal
Publication Type :
Academic Journal
Accession number :
32585641
Full Text :
https://doi.org/10.1088/1361-648X/aba015