Tuning low-energy scales in YbRh\(_2\)Si\(_2\) by non-isoelectronic substitution and pressure

The heavy-fermion metal YbRh\(_2\)Si\(_2\) realizes a field-induced quantum critical point with multiple vanishing energy scales \(T_{\rm N}(B)\) and \(T^\ast(B)\). We investigate their change with partial non-isoelectronic substitutions, chemical and hydrostatic pressure. Low-temperature electrical...

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Bibliographic Details
Published in:arXiv.org 2019-09
Main Authors: M -H Schubert, Tokiwa, Y, S -H Hübner, Mchalwat, M, Blumenröther, E, Jeevan, H S, Gegenwart, P
Format: Article
Language:English
Subjects:
Critical point
Crossovers
Fermions
Ferromagnetism
Hydrostatic pressure
Iron
Magnetic fields
Magnetic permeability
Nickel
Organic chemistry
Silicon
Substitutes
Variations
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Summary:The heavy-fermion metal YbRh\(_2\)Si\(_2\) realizes a field-induced quantum critical point with multiple vanishing energy scales \(T_{\rm N}(B)\) and \(T^\ast(B)\). We investigate their change with partial non-isoelectronic substitutions, chemical and hydrostatic pressure. Low-temperature electrical resistivity, specific heat and magnetic susceptibility of Yb(Rh\(_{1-x}\)T\(_x\))\(_2\)Si\(_2\) with T=Fe or Ni for \(x\leq 0.1\), magnetic fields \(B\leq 0.3\)~T (applied perpendicular to the c-axis) and hydrostatic pressure \(p\leq 1.5\)~GPa are reported. The data allow to disentangle the combined influences of hydrostatic and chemical pressure, as well as non-isoelectronic substitution. In contrast to Ni- and Co-substitution, which enhance magnetic order, Fe-substitution acts oppositely. For \(x=0.1\) it also completely suppresses the \(T^\ast\) crossover and eliminates ferromagnetic fluctuations. The pressure, magnetic field and temperature dependences of \(T^\ast\) are incompatible with its interpretation as Kondo breakdown signature.
ISSN:2331-8422
DOI:10.48550/arxiv.1909.05194