Robust superconductivity with large upper critical field in Nb{sub 2}PdS{sub 5}

Journal Article · Sat Jun 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4881278· OSTI ID:22304255

Jha, Rajveer; Tiwari, Brajesh; Rani, Poonam; Kishan, Hari; Awana, V. P. S., ^[1]

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1. Quantum Phenomena and Applications Division, National Physical Laboratory (CSIR), Dr. K. S. Krishnan Road, New Delhi-110012 (India)

We report synthesis, structural details, and complete superconducting characterization of very recently discovered [Q. Zhang, Sci. Rep. 3, 1446 (2013)] Nb{sub 2}PdS{sub 5} new superconductor. The synthesized compound is crystallized in monoclinic structure with C2/m (#12) space group. Bulk superconductivity is seen in both ac/dc magnetic susceptibility and electrical resistivity measurements with superconducting transition temperature (T{sub c}) at 6 K. The upper critical field (H{sub c2}) being estimated from high field magneto-transport [ρ(T)H] measurements is above 240 kOe. The estimated H{sub c2}(0) is clearly above the Pauli paramagnetic limit of ∼1.84T{sub c}. Heat capacity (C{sub p}) measurements show clear transition with well defined peak at T{sub c}, but with lower jump than as expected for a Bardeen–Cooper–Schrieffer type superconductor. The Sommerfeld constant (γ) and Debye temperature (Θ{sub D}) as determined from low temperature fitting of C{sub P}(T) data are 32 mJ/mole-K{sup 2} and 263 K, respectively. Hall coefficients and resistivity in conjugation with electronic heat capacity indicates multiple gap superconductivity signatures in Nb{sub 2}PdS{sub 5}. We also studied the impact of hydrostatic pressure (0–1.97 Gpa) on superconductivity of Nb{sub 2}PdS{sub 5} and found nearly no change in T{sub c} for the given pressure range.

• OSTI ID: 22304255
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BCS THEORY
CRITICAL FIELD
DEBYE TEMPERATURE
MAGNETIC SUSCEPTIBILITY
MONOCLINIC LATTICES
NIOBIUM COMPOUNDS
PALLADIUM COMPOUNDS
PARAMAGNETISM
PRESSURE RANGE GIGA PA
SOMMERFELD CONSTANT
SPACE GROUPS
SPECIFIC HEAT
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
TERNARY ALLOY SYSTEMS
TRANSITION TEMPERATURE