D. K. Goswami

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Doped Cage-like Structure of Cd[sub 9]S[sub 9]

AIP conference proceedings (2010)

Prajakta Deodhar Anjali Kshirsagar P. K. Giri D. K. Goswami A. Perumal

The smallest stable stoichiometric cage‐like structure Cd9S9 of CdnSn is found to have enough space to dope atom(s) endohedrally. Theoretical investigations of mono‐doped and bi‐doped Cd9S9 with 3d transition metal atoms indicate that endohedral bi‐doped cage is not stable however bi‐doped cage with one atom at the endohedral site and other substituting a Cd atom retains the original geometry. Magnetic moment of the transition metal atom is generally retained in the cagelike structure. Endohedral mono‐doped Co cage is found to be the best probable candidate for self‐assembly.

Cage

Stoichiometry

10.1063/1.3504338

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Surface-phase superconductivity in Mg-deficient V-doped MgTi$_2$O$_4$ spinel

arXiv (Cornell University) (2022)

A. Rahaman T. Paramanik B. Pal Riju Pal P. Maji

Around fifty years ago, LiTi$_2$O$_4$ was reported to be first spinel oxide to exhibit a superconducting transition with highest T$_c$ $\approx$ 13.7 K. Recently, MgTi$_2$O$_4$ has been found to be the only other spinel oxide to reveal a superconducting transition with a T$_c$ $\approx$ 3 K, however, its superconducting state is realized only in thin film superlattices involving SrTiO$_3$. We find that a V-doped Mg$_{1-x}$Ti$_2$O$_4$ phase, which gets stabilized as a thin surface layer on top of stoichiometric and insulating V-doped MgTi$_2$O$_4$ bulk sample, exhibits high-temperature superconductivity with T$_c$ $\approx$ 16 K. The superconducting transition is also confirmed through a concomitant sharp diamagnetic transition immediately below T$_c$. The spinel phase of the superconducting surface layer is elucidated through grazing-incidence X-ray diffraction and Micro-Raman spectroscopy. A small shift of the sharp superconducting transition temperature ($\sim$ 4 K) with application of a high magnetic field (upto 9 Tesla) suggests a very high critical field for the system, $\sim$ 25 Tesla. Thus, V-doped Mg$_{1-x}$Ti$_2$O$_4$ exhibits the highest T$_c$ among spinel superconductors and also possesses a very high critical field.

Diamagnetism

Transition temperature

10.48550/arxiv.2209.02053

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