TY - JOUR
T1 - Complex magnetism and magneto-transport of RECoPO (RE =La, Nd, and Sm)
AU - Pal, Anand
AU - Mehdi, Syed Sajjad
AU - Husain, Mushahid
AU - Gahtori, Bhasker
AU - Awana, V. P.S.
N1 - Funding Information:
The authors thank their Director, Prof. R. C. Budhani, for his keen interest and encouragement for the study. Anand Pal would like to thank CSIR (Council of Scientific and Industrial Research) for granting him senior research fellowship. Bhasker Gahtori thanks DST (Department of Science and Technology) for supporting him by the Fast Track Fellowship Post Doctoral Program to work on doped Fe–based superconductors.
PY - 2011/11/15
Y1 - 2011/11/15
N2 - We report the electrical, magnetotransport, and specific heat of the layered polycrystalline RECoPO (RE La, Nd, and Sm) samples. These compounds are iso-structural to recently discovered superconductor LaFeAs(O/F). Bulk polycrystalline samples are synthesized by a solid state reaction route in an evacuated sealed quartz tube. All these compounds are crystallized in a tetragonal structure with space group P4/nmm. Cobalt in these compounds is in an itinerant state, with its paramagnetic moment above 1.4 B and the same orders ferromagnetically (FM) with saturation moment of around 0.20 B below, say, 80 K. Though, LaCoPO shows single paramagnetic (PM) to ferromagnetic (FM) transition near 35 K, the NdCoPO and SmCoPO exhibit successive PM-FM-anti-ferromagnetic (AFM) transitions. Both FM and AFM transition temperatures vary with applied fields. Although the itinerant ferromagnetism occurs with small saturation moment, typical anti-ferromagnetic (AFM) transitions (TN1, TN2) are observed at 60 K and 14 K for Nd and 70 K and 40 K for Sm. This FM-AFM transition of Co spins in NdCoPO and SmCoPO is both field and temperature dependent. The magneto-transport of NdCoPO and SmCoPO distinctly follows their successive PM-FM-AFM transitions. It is clear that Sm/Nd (4f) interacts with the Co (3d) in first-time-synthesized Sm/NdCoPO.
AB - We report the electrical, magnetotransport, and specific heat of the layered polycrystalline RECoPO (RE La, Nd, and Sm) samples. These compounds are iso-structural to recently discovered superconductor LaFeAs(O/F). Bulk polycrystalline samples are synthesized by a solid state reaction route in an evacuated sealed quartz tube. All these compounds are crystallized in a tetragonal structure with space group P4/nmm. Cobalt in these compounds is in an itinerant state, with its paramagnetic moment above 1.4 B and the same orders ferromagnetically (FM) with saturation moment of around 0.20 B below, say, 80 K. Though, LaCoPO shows single paramagnetic (PM) to ferromagnetic (FM) transition near 35 K, the NdCoPO and SmCoPO exhibit successive PM-FM-anti-ferromagnetic (AFM) transitions. Both FM and AFM transition temperatures vary with applied fields. Although the itinerant ferromagnetism occurs with small saturation moment, typical anti-ferromagnetic (AFM) transitions (TN1, TN2) are observed at 60 K and 14 K for Nd and 70 K and 40 K for Sm. This FM-AFM transition of Co spins in NdCoPO and SmCoPO is both field and temperature dependent. The magneto-transport of NdCoPO and SmCoPO distinctly follows their successive PM-FM-AFM transitions. It is clear that Sm/Nd (4f) interacts with the Co (3d) in first-time-synthesized Sm/NdCoPO.
UR - https://www.scopus.com/pages/publications/82555192886
UR - https://www.scopus.com/pages/publications/82555192886#tab=citedBy
U2 - 10.1063/1.3662151
DO - 10.1063/1.3662151
M3 - Article
AN - SCOPUS:82555192886
SN - 0021-8979
VL - 110
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 10
M1 - 103913
ER -