Impact of isoelectronic substitution and hydrostatic pressure on the quantum critical properties of CeRhSi3
- 25 June 2020
- journal article
- research article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 32 (42), 425601
- https://doi.org/10.1088/1361-648x/aba015
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 CeRhSi3. In order to explore this question we prepared single crystals of CeRh(Si1-x Ge x )3 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 antiferromagentic (AFM) at higher temperatures being T N = 4.7 K and T N1 = 19.7 K, respectively. Application of pressure suppresses T N (T N1) 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 N(p) → 0 of CeRh(Si0.95Ge0.05)3 yields a critical pressure of p c ≈ 3.4 GPa (in CeRh(Si0.85Ge0.15)3 p c ≈ 3.5 GPa) pointing to the presence of an AFM QCP located deep inside the superconducting state.Keywords
Funding Information
- Grantová Agentura České Republiky (17-04925J)
- European Cooperation in Science and Technology (CA16218 - INTER-COST No. LTC18024)
- National Institute for Materials Science (International Cooperative Graduatio)
- Czech Research Infrastructures (LM2018096)
This publication has 45 references indexed in Scilit:
- Destruction of the Kondo effect in the cubic heavy-fermion compound Ce3Pd20Si6Nature Materials, 2012
- Superconductivity without phononsNature, 2007
- Fermi surface and superconductivity in noncentrosymmetricPhysical Review B, 2007
- Extremely High Upper Critical Magnetic Field of the Noncentrosymmetric Heavy Fermion SuperconductorPhysical Review Letters, 2007
- Hidden magnetism and quantum criticality in the heavy fermion superconductor CeRhIn5Nature, 2006
- An unconventional metallic state in YbRh2(Si1 xGex)2 a high pressure studyJournal of Physics: Condensed Matter, 2002
- Competition between magnetism and superconductivity inPhysical Review B, 1997
- The purification and crystal growth of rare earth metals using solid state electrotransportJournal of the Less Common Metals, 1987
- Low-temperature magnetic and electrical properties of the new ternary silicides LaMSi3 and CeMSi3 with M ≡ Co, Rh, Ir, Ru, OsJournal of the Less Common Metals, 1985
- Quantum critical phenomenaPhysical Review B, 1976