Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content

Abstract

The experimental evidence for the contraction of volume of gold implanted with hydrogen at low doses is presented. The contraction of lattice upon the addition of other elements is very rare and extraordinary in the solid-state, not only for gold but also for many other solids. To explain the underlying physics, the pure kinetic theory of absorption is not adequate and the detailed interaction of hydrogen in the lattice needs to be clarified. Our analysis points to the importance of the formation of hydride bonds in a dynamic manner and explains why these bonds become weak at higher doses, leading to the inverse process of volume expansion frequently seen in metallic hydrogen containers.

Shot noise in a strange metal

“…trange metals are non-Fermi liquids that exhibit an electrical resistivity that exhibit a low temperature (T) electrical resistivity contribution that is directly proportional to T (1). This response has been reported across many materials families, including cuprate (2-4) and pnictide (5) superconductors, ruthenates (6), heavy fermion metals (7)(8)(9), and twisted bilayer graphene (10). Strange-metal properties typically arise at finite temperature above a quantum critical point (QCP), often in proximity to antiferromagnetic order (11).…”

“…We have successfully made mesoscopic wires for noise measurements from epitaxial films of the heavy fermion material YbRh 2 Si 2 , a particularly well-defined strange metal (9,28). YbRh 2 Si 2 has a zero-temperature magnetic fieldinduced continuous quantum phase transition from a low-field antiferromagnetic heavy Fermi liquid metal to a paramagnetic one.…”

The many faces (phases) of strong correlations

“…For further reading we refer the reader to [3]. Finally, new experimental techniques, for instance measurements at ultralow temperatures [9] or the growth of quantum critical heavy fermion compounds by molecular beam epitaxy [4], open entirely new possibilities. One of the grand challenges to attack is to exploit the rich physics of correlated quantum materials for quantum devices.…”

Kondo‐Mania

“…Als „Magnetfeld“ wird hier die magnetische Flussdichte bezeichnet. Am quantenkritischen Punkt zeigt der Widerstand oberhalb der Supraleitung lineares Verhalten über mehr als drei Größenordnungen in der Temperatur (nach [7]).…”

“…Dazu wurde der elektrische Widerstand von YbRh2Si2 bei Temperaturen bis unter ein Millikelvin gemessen. Tatsächlich wurde Supraleitung gefunden, die unmittelbar aus einem sich über fast vier Größenordnungen erstrechenden, linearen Temperaturverlauf entsteht [7]. Dies legt die Vermutung nahe, dass die Supraleitung durch dieselben Quantenfluktuationen bedingt ist wie der lineare Widerstand.…”