Metal-semiconductor transition in single crystal hexagonal nickel sulphide

Townsend, M. G.; Tremblay, R.; Horwood, J. L.; Ripley, L J

doi:10.1088/0022-3719/4/5/010

Cited by 47 publications

(9 citation statements)

References 24 publications

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“…A transition in Fig. 13 is evident starting around À9°C which is in good agreement with what has been reported in literature for a-NiS [3][4][5][6]. Due to the limitations of the homemade chamber, the cooling cycle could not be measured.…”

Section: Electronic Measurementssupporting

confidence: 89%

“…Interest in this material came after Sparks and Komoto [2] discovered that the a-NiS phase exhibited a metal-to-insulator (MIT) phase transition which is accompanied by a paramagnetic-to-antiferromagnetic phase transition at a temperature of À9°C. Theoretical and experimental studies have been dedicated into finding out the cause of this transition as well as factors that affect it [3][4][5][6][7][8][9][10]. Nanotechnology based research has also taken its part in developing procedures for the fabrication of this unique material.…”

Section: Introductionmentioning

confidence: 99%

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Observation of the structural, optical and magnetic properties during the transformation from hexagonal NiS nano-compounds to cubic NiO nanostructures due to thermal oxidation

Linganiso

Mwakikunga

Coville

et al. 2015

Journal of Alloys and Compounds

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Section: Electronic Measurementssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Observation of the structural, optical and magnetic properties during the transformation from hexagonal NiS nano-compounds to cubic NiO nanostructures due to thermal oxidation

Linganiso

Mwakikunga

Coville

et al. 2015

Journal of Alloys and Compounds

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“…In order to understand more fully these transition features, a further investigation is needed for the crystal structure below the transition temperature. Magnetic data for the disordered phase are in agreement with those reported hitherto for the Ni1-xS phase (18) The samples of the ordered phase exhibited metallic conduction, which can arise from the overlap of the d-orbitals of the nickel atoms along the c axis because of the smaller axial ratio (c/a=1.55) than the ideal value 1.63 (19 …”

Section: Discussionsupporting

confidence: 87%

Defect Control of Nickel Sulfide by Heat-Treatment in Sulfur Atmosphere

et al. 1979

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“…The controversy relates to the very basic issue of the nature of the transition, with various groups describing it as a metal-insulator transition [2][3][4][5][6][7], while nearly equal number of groups claiming it to be a metal-metal transition [8][9][10][11][12]. The transport and magnetic properties are that NiS is a highly conducting (≈10 −5 ohm-cm) Pauli paramagnetic metal at room temperature with a characteristic metallic dependence of resistivity on temperature [10,11].…”

mentioning

confidence: 99%

Electronic Structure ofNiS1−xSexacross the Phase Transition

et al. 1998

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We report very highly resolved photoemission spectra of NiS1−xSex across the so-called metalinsulator transition as a function of temperature as well as composition. The present results convincingly demonstrate that the low temperature, antiferromagnetic phase is metallic, with a reduced density of states at EF . This decrease is possibly due to the opening of gaps along specific directions in the Brillouin zone caused by the antiferromagnetic ordering.While metal-insulator transition has been one of the outstanding problems in condensed matter physics [1], the specific case of a transition in hexagonal NiS [2] as a function of temperature has been possibly the most controversial, spanning a period of three decades. The controversy relates to the very basic issue of the nature of the transition, with various groups describing it as a metal-insulator transition [2][3][4][5][6][7], while nearly equal number of groups claiming it to be a metal-metal transition [8][9][10][11][12]. The transport and magnetic properties are that NiS is a highly conducting (≈10 −5 ohm-cm) Pauli paramagnetic metal at room temperature with a characteristic metallic dependence of resistivity on temperature [10,11]. Near 260 K, the system undergoes a first order phase transition, with a nearly two orders of magnitude increase in resistivity (≈10 −3 ohm-cm) [10,11]. The system becomes antiferromagnetic below the transition [3], showing a volume expansion of about ≈1.9% without any change in crystal symmetry. While it is generally agreed that the high temperature phase represents an example of a highly conducting metallic compound, the controversy continues to exist concerning the nature of the low temperature phase. Normally one would expect that transport measurements would readily resolve the question concerning the metallic or insulating phase of the ground state. A very unusual nearly temperature independent resistivity down to about 4 K [10,11], however, does not provide any unambiguous clue. While in a metallic system the resistivity is expected to decrease with temperature, in contrast to the observed behavior, an insulating ground state should have very manifest exponentially increasing resistivity, when the temperature scale is lower than the band gap. Thus, if the low temperature phase is insulating, the band gap should be much smaller than 4 K (< 0.5 meV). On the other hand, if it is metallic, it has to be an unusual state where the resistivity is nearly independent of temperature over a wide range of temperature (4 K ≤ T ≤ 260 K). Unfortunately, theoretical studies have not been of much help in settling these discussions in favor of either of the views. The earliest non-self-consistent band structure calculations [13] correctly predicted the high temperature Pauli paramagnetic phase to be metallic, while the low temperature anti-ferromagnetic phase yielded a small gap. However, subsequent self-consistent band structure calculations [14] based on local spin density approximation (LSDA) failed to yield any gap. Similarly, the LDA+...

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Metal-semiconductor transition in single crystal hexagonal nickel sulphide

Cited by 47 publications

References 24 publications

Observation of the structural, optical and magnetic properties during the transformation from hexagonal NiS nano-compounds to cubic NiO nanostructures due to thermal oxidation

Observation of the structural, optical and magnetic properties during the transformation from hexagonal NiS nano-compounds to cubic NiO nanostructures due to thermal oxidation

Defect Control of Nickel Sulfide by Heat-Treatment in Sulfur Atmosphere

Electronic Structure ofNiS1−xSexacross the Phase Transition

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