Suppression of spin density wave character of (Sm/Gd)FeAsO by substitution of Ru at Fe site

Anand Pal; Arpita Vajpayee; V. P.S. Awana; M. Husain; H. Kishan

doi:10.1016/j.physc.2009.11.015

Suppression of spin density wave character of (Sm/Gd)FeAsO by substitution of Ru at Fe site

Anand Pal, Arpita Vajpayee^*, V. P.S. Awana, M. Husain, H. Kishan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We report synthesis, structural details and transport measurements on SmFe_0.5Ru_0.5AsO and GdFe_0.5Ru_0.5AsO. The samples are synthesized at normal pressure with vacuum encapsulation technique. The parent REFeAsO (RE = Sm and Gd) crystallizes in tetragonal P4/nmm space group having their lattice parameters as a = 3.9375(6)Å, c = 8.5021(4) for Sm and a = 3.9152(4)Å, c = 8.4546(1) for Gd. With 50% Ru substitution at Fe site i.e. for SmFe_0.5Ru_0.5AsO and GdFe_0.5Ru_0.5AsO the lattice parameter a is increased and c is decreased to as a = 4.0113(55)Å, c = 8.3129(17) for Sm and a = 3.9795(64)Å, c = 8.2787 (20) for Gd samples. Resistivity measurements on pristine samples though exhibited clearly the step like metallic transition at around 150 K, the Fe site 50% Ru substituted samples show all through a metallic behavior without the characteristic spin density wave (SDW) step. The samples with lower content of Ru at Fe site i.e. 10% and 30% are also studied. Though 10% Ru doped samples exhibited weak superconductivity like transition below 15 K, the 30% doped samples are metallic. It seems that the Fe²⁺ site Ru^4+/5+ substitution provides electron carriers for conduction process. For achieving bulk superconductivity in Fe-site Ru substituted REFeAsO (1111) systems the efforts are still underway.

Original language	English
Pages (from-to)	S491-S492
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.015
Publication status	Published - 12-2010

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2009.11.015

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@article{349fdc58a4724aa1aa5a07deb87156c5,

title = "Suppression of spin density wave character of (Sm/Gd)FeAsO by substitution of Ru at Fe site",

abstract = "We report synthesis, structural details and transport measurements on SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO. The samples are synthesized at normal pressure with vacuum encapsulation technique. The parent REFeAsO (RE = Sm and Gd) crystallizes in tetragonal P4/nmm space group having their lattice parameters as a = 3.9375(6){\AA}, c = 8.5021(4) for Sm and a = 3.9152(4){\AA}, c = 8.4546(1) for Gd. With 50\% Ru substitution at Fe site i.e. for SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO the lattice parameter a is increased and c is decreased to as a = 4.0113(55){\AA}, c = 8.3129(17) for Sm and a = 3.9795(64){\AA}, c = 8.2787 (20) for Gd samples. Resistivity measurements on pristine samples though exhibited clearly the step like metallic transition at around 150 K, the Fe site 50\% Ru substituted samples show all through a metallic behavior without the characteristic spin density wave (SDW) step. The samples with lower content of Ru at Fe site i.e. 10\% and 30\% are also studied. Though 10\% Ru doped samples exhibited weak superconductivity like transition below 15 K, the 30\% doped samples are metallic. It seems that the Fe2+ site Ru4+/5+ substitution provides electron carriers for conduction process. For achieving bulk superconductivity in Fe-site Ru substituted REFeAsO (1111) systems the efforts are still underway.",

author = "Anand Pal and Arpita Vajpayee and Awana, \{V. P.S.\} and M. Husain and H. Kishan",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.11.015",

language = "English",

volume = "470",

pages = "S491--S492",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

number = "SUPPL.1",

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TY - JOUR

T1 - Suppression of spin density wave character of (Sm/Gd)FeAsO by substitution of Ru at Fe site

AU - Pal, Anand

AU - Vajpayee, Arpita

AU - Awana, V. P.S.

AU - Husain, M.

AU - Kishan, H.

PY - 2010/12

Y1 - 2010/12

N2 - We report synthesis, structural details and transport measurements on SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO. The samples are synthesized at normal pressure with vacuum encapsulation technique. The parent REFeAsO (RE = Sm and Gd) crystallizes in tetragonal P4/nmm space group having their lattice parameters as a = 3.9375(6)Å, c = 8.5021(4) for Sm and a = 3.9152(4)Å, c = 8.4546(1) for Gd. With 50% Ru substitution at Fe site i.e. for SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO the lattice parameter a is increased and c is decreased to as a = 4.0113(55)Å, c = 8.3129(17) for Sm and a = 3.9795(64)Å, c = 8.2787 (20) for Gd samples. Resistivity measurements on pristine samples though exhibited clearly the step like metallic transition at around 150 K, the Fe site 50% Ru substituted samples show all through a metallic behavior without the characteristic spin density wave (SDW) step. The samples with lower content of Ru at Fe site i.e. 10% and 30% are also studied. Though 10% Ru doped samples exhibited weak superconductivity like transition below 15 K, the 30% doped samples are metallic. It seems that the Fe2+ site Ru4+/5+ substitution provides electron carriers for conduction process. For achieving bulk superconductivity in Fe-site Ru substituted REFeAsO (1111) systems the efforts are still underway.

AB - We report synthesis, structural details and transport measurements on SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO. The samples are synthesized at normal pressure with vacuum encapsulation technique. The parent REFeAsO (RE = Sm and Gd) crystallizes in tetragonal P4/nmm space group having their lattice parameters as a = 3.9375(6)Å, c = 8.5021(4) for Sm and a = 3.9152(4)Å, c = 8.4546(1) for Gd. With 50% Ru substitution at Fe site i.e. for SmFe0.5Ru0.5AsO and GdFe0.5Ru0.5AsO the lattice parameter a is increased and c is decreased to as a = 4.0113(55)Å, c = 8.3129(17) for Sm and a = 3.9795(64)Å, c = 8.2787 (20) for Gd samples. Resistivity measurements on pristine samples though exhibited clearly the step like metallic transition at around 150 K, the Fe site 50% Ru substituted samples show all through a metallic behavior without the characteristic spin density wave (SDW) step. The samples with lower content of Ru at Fe site i.e. 10% and 30% are also studied. Though 10% Ru doped samples exhibited weak superconductivity like transition below 15 K, the 30% doped samples are metallic. It seems that the Fe2+ site Ru4+/5+ substitution provides electron carriers for conduction process. For achieving bulk superconductivity in Fe-site Ru substituted REFeAsO (1111) systems the efforts are still underway.

UR - https://www.scopus.com/pages/publications/78649694736

UR - https://www.scopus.com/inward/citedby.url?scp=78649694736&partnerID=8YFLogxK

U2 - 10.1016/j.physc.2009.11.015

DO - 10.1016/j.physc.2009.11.015

M3 - Article

AN - SCOPUS:78649694736

SN - 0921-4534

VL - 470

SP - S491-S492

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.1

ER -

Suppression of spin density wave character of (Sm/Gd)FeAsO by substitution of Ru at Fe site

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