Magnetic properties and specific-heat studies of the metal-insulator transition in BaCo0.9Ni0.1S2-y

I. Felner; J. Gersten; S. Litvin; U. Asaf; T. Kröner

doi:10.1103/PhysRevB.52.10097

Magnetic properties and specific-heat studies of the metal-insulator transition in BaCo0.9Ni0.1S2-y

I. Felner^*, J. Gersten, S. Litvin, U. Asaf, T. Kröner

^*Corresponding author for this work

Racah Institute of Physics

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

11 Scopus citations

Abstract

We have investigated the BaCo0.9Ni0.1S2-y system which crystallizes in the tetragonal BaNiS2-type structure, by several complementary experimental techniques. The insulating stoichiometric compound (y=0) is antiferromagnetically ordered TN=265 K. The sulfur-deficient compounds undergo a first-order metal-insulator (MI) transition at Ts=220 K. Mössbauer studies on doped57 materials show that the magnetic structure observed in the insulating state persists in the metallic state without any discontinuity in the magnetic properties. In addition, this MI transition is accompanied by (i) a slight distortion in the tetragonal BaNiS2 structure, and by (ii) a valence transition of divalent Ni2+ ions to monovalent Ni. Specific-heat measurements show an anomaly at the MI transition, and the entropy associated with this transition is 1.6 (J/mol K) and is associated with both crystallographic and valence transitions.

Original language	English
Pages (from-to)	10097-10103
Number of pages	7
Journal	Physical Review B
Volume	52
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.52.10097
State	Published - 1995

Access to Document

10.1103/PhysRevB.52.10097

Cite this

@article{4aa5e78844bf4fe78a7207b09c478498,

title = "Magnetic properties and specific-heat studies of the metal-insulator transition in BaCo0.9Ni0.1S2-y",

abstract = "We have investigated the BaCo0.9Ni0.1S2-y system which crystallizes in the tetragonal BaNiS2-type structure, by several complementary experimental techniques. The insulating stoichiometric compound (y=0) is antiferromagnetically ordered TN=265 K. The sulfur-deficient compounds undergo a first-order metal-insulator (MI) transition at Ts=220 K. M{\"o}ssbauer studies on doped57 materials show that the magnetic structure observed in the insulating state persists in the metallic state without any discontinuity in the magnetic properties. In addition, this MI transition is accompanied by (i) a slight distortion in the tetragonal BaNiS2 structure, and by (ii) a valence transition of divalent Ni2+ ions to monovalent Ni. Specific-heat measurements show an anomaly at the MI transition, and the entropy associated with this transition is 1.6 (J/mol K) and is associated with both crystallographic and valence transitions.",

author = "I. Felner and J. Gersten and S. Litvin and U. Asaf and T. Kr{\"o}ner",

year = "1995",

doi = "10.1103/PhysRevB.52.10097",

language = "אנגלית",

volume = "52",

pages = "10097--10103",

journal = "Physical Review B",

issn = "0163-1829",

publisher = "American Physical Society",

number = "14",

}

TY - JOUR

T1 - Magnetic properties and specific-heat studies of the metal-insulator transition in BaCo0.9Ni0.1S2-y

AU - Felner, I.

AU - Gersten, J.

AU - Litvin, S.

AU - Asaf, U.

AU - Kröner, T.

PY - 1995

Y1 - 1995

N2 - We have investigated the BaCo0.9Ni0.1S2-y system which crystallizes in the tetragonal BaNiS2-type structure, by several complementary experimental techniques. The insulating stoichiometric compound (y=0) is antiferromagnetically ordered TN=265 K. The sulfur-deficient compounds undergo a first-order metal-insulator (MI) transition at Ts=220 K. Mössbauer studies on doped57 materials show that the magnetic structure observed in the insulating state persists in the metallic state without any discontinuity in the magnetic properties. In addition, this MI transition is accompanied by (i) a slight distortion in the tetragonal BaNiS2 structure, and by (ii) a valence transition of divalent Ni2+ ions to monovalent Ni. Specific-heat measurements show an anomaly at the MI transition, and the entropy associated with this transition is 1.6 (J/mol K) and is associated with both crystallographic and valence transitions.

AB - We have investigated the BaCo0.9Ni0.1S2-y system which crystallizes in the tetragonal BaNiS2-type structure, by several complementary experimental techniques. The insulating stoichiometric compound (y=0) is antiferromagnetically ordered TN=265 K. The sulfur-deficient compounds undergo a first-order metal-insulator (MI) transition at Ts=220 K. Mössbauer studies on doped57 materials show that the magnetic structure observed in the insulating state persists in the metallic state without any discontinuity in the magnetic properties. In addition, this MI transition is accompanied by (i) a slight distortion in the tetragonal BaNiS2 structure, and by (ii) a valence transition of divalent Ni2+ ions to monovalent Ni. Specific-heat measurements show an anomaly at the MI transition, and the entropy associated with this transition is 1.6 (J/mol K) and is associated with both crystallographic and valence transitions.

UR - http://www.scopus.com/inward/record.url?scp=0000507638&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.52.10097

DO - 10.1103/PhysRevB.52.10097

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:0000507638

SN - 0163-1829

VL - 52

SP - 10097

EP - 10103

JO - Physical Review B

JF - Physical Review B

IS - 14

ER -

Magnetic properties and specific-heat studies of the metal-insulator transition in BaCo0.9Ni0.1S2-y

Abstract

Access to Document

Other files and links

Fingerprint

Cite this