arXiv subjects

Arumugam Thamizhavel

Publications and source records attributed to Arumugam Thamizhavel.

39 records · Page 3Linked to original sources

arXiv2012

Plasmon mode modifies the elastic response of a nanoscale charge density wave system

The elastic response of suspended NbSe3 nanowires is studied across the charge density wave phase transition. The nanoscale dimensions of the resonator lead to a large resonant frequency (10-100 MHz), bringing the excited phonon frequency in close proximity of the plasmon mode of the electronic condensate - a parameter window not accessible in bulk systems. The interaction between the phonon and plasmon modes strongly modifies the elastic properties at high frequencies. This is manifested in the nanomechanics of the system as a sharp peak in the temperature dependence of the elastic modulus (relative change of 12.8%) in the charge density wave phase.

cond-mat.mes-hall↗

arXiv2012

Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd

We report directional point contact Andreev reflection (PCAR) measurements on high-quality single crystals of the non-centrosymmetric superconductor, BiPd. The PCAR spectra measured on different crystallographic faces of the single crystal clearly show the presence of multiple superconducting energy gaps. For point contacts with low resistance, in addition to the superconducting gap feature, a pronounced zero bias conductance peak is observed. These observations provide strong evidence of the presence of unconventional order parameter in this material.

cond-mat.supr-con↗

arXiv2011

`17-15' Superconductivity - Rh17S15 and Pd17Se15

The presence of strongly correlated superconductivity in Rh17S15 has been recently established. In this work, we compare the normal and superconducting parameters of a single crystal of Rh17S15 with those of a polycrystalline sample of Pd17Se15 which is reported here for the first time to be a superconductor below 2.2 K. Pd17Se15, which is iso-structural to Rh17S15 (space group Pm3m), has very different properties and provides for an interesting study in contrast with Rh17S15. We see that large unit volume of Pd17Se15 and the large separation of Pd-Pd atoms in its structure as compared those in a pure Pd metal lead to the absence of strong correlations in this compound. Finally, we report band structure calculations on these two compounds and compare the density of states with estimates from heat capacity data. Upper critical field, Heat capacity (down to 500 mK), Hall effect and band structure studies suggest that Rh17S15 is a multiband superconductor.

cond-mat.supr-con↗