Influence of Hydrostatic Pressure on the Insulator-Metal Transition in BaC<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">o</mml:mi></mml:mrow><mml:mrow><mml:mn>0.9</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>N<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">i</mml:mi></mml:mrow><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></

Looney, C.; Schilling, J. S.; Martinson, L. S.; Schweitzer, J. W.

doi:10.1103/physrevlett.76.4789

Cited by 20 publications

(15 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretical work by Ahn et al [21] has indicated that the combined effects of long-range strain field and local intrinsic disorder naturally give rise to the phase separation and a metastable landscape with hierarchical energy barriers for relieving the strain, which can explain the phase separation in manganites [12] The phase separation occurred in BaCo 0.9 N i 0.1 S 1.97 should follow this mechanism. This is confirmed with the suppression of AFI-PMM transition by pressure [17]. Phase conversion within the admixture involves rearrangement of many coupled degrees of freedom spanning all relevant length scales.…”

supporting

confidence: 57%

See 1 more Smart Citation

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Wang

Xh²,

Wu³

et al. 2008

Phys. Rev. Lett.

View full text Add to dashboard Cite

We find an unconventional nucleation of low temperature paramagnetic metal (PMM) phase with monoclinic structure from the matrix of high-temperature antiferromagnetic insulator (AFI) phase with tetragonal structure in strongly correlated electronic system BaCo0.9N i0.1S1.97. Such unconventional nucleation leads to a decease in resistivity by several orders with relaxation at a fixed temperature without external perturbation. The novel dynamical process could arise from the competition of strain fields, Coulomb interactions, magnetic correlations and disorders. Such competition may frustrate the nucleation, giving rise to a slow, nonexponential relaxation and "physical aging" behavior. [3,4]. Such nonergodic behavior is very interesting because one normally expects electron systems to relax rather rapidly. Many glassy systems exhibit a nonstationary behavior that has been described as "physical aging" [5]. Recently, the electron glass has received renewed interest [6,7] as the subject of electron-electron interactions has become a central topic in understanding the metal-insulator transition (MIT) in two dimensions [8]. Such glass behavior is believed to be associated with the interplay between disorder and strong electronic correlations [9]. Phase separation widely observed in strongly correlated electronic system [10,11] provides the possibility for appearance of locally metastable states, giving rise to the self-organized inhomogeneities (disorders). Phase separation (PS) scenario appears as particularly favorable for the existence of out-of-equilibrium features. Therefore, it is expected that the glass behavior occurs in the strongly correlated electronic system due to interplay between disorder and strong electronic correlations [9], especially in phase separation region. Indeed, a pronounced glassy response [12] and a memory effect have been recently observed in phase separated manganites [13]. The interplay of strong electronic correlations and disorder is believed to be responsible for many new phenomena occurring in complex materials in the MIT region [14]. Therefore, Novel findings in complex materials with strongly electronic correlations in the MIT region clearly deserves further study.BaCoS 2 is a Mott-Hubbard insulator having Co 2 S 2 layers with spin-1/2 Co ions that order antiferomagnetically at 310 K, and properties shared by members of the high T c cuprates. Such quasi-two dimensional system BaCoS 2 with CoS conducting planes separated by insulating BaS rocksalt sheets is structurally analogous to the high-T c cuprates [15]. Substitution of Ni for Co leads to a first-order transition from an antiferromagnetic insulator (AFI) to a paramagnetic metal (PMM) upon cooling at T c in the layered BaCo 0.9 N i 0.1 S 2−y system for 0.05 ≤ y ≤ 0.20 [15]. Such AFI-PMM phase transition is associated with a structural change from hightemperature tetragonal (HTT) phase to low-temperature monoclinic (LTM) phase [16].In this letter, we report a novel dynamical process for the MIT transition due to the interplay...

show abstract

supporting

confidence: 57%

“…The sample shows an insulating behavior with a kink at T s ∼ 65K upon cooling. Such kink, referred to a first-order AFI-I ′ transition, has been observed in sample BaCo 0.9 N i 0.1 S 1.9 after complete suppression of the AFI-PMM transition by pressure [17]. A hysteresis is observed between curves recorded upon cooling and subsequent heating.…”

mentioning

confidence: 81%

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Wang

Xh²,

Wu³

et al. 2008

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…It is noteworthy that although the resistivity jump depends strongly on y, the change in susceptibility is almost the same for y ϭ 0.1, 0.15, and 0.2. 1 Recently, application of hydrostatic pressure was observed by Looney et al, 4 to depress T s on heating and cooling. Using the Clausius-Clapeyron equation and the measured dT s /dp, these authors calculated an entropy change of 0.6 cal/mole K at the transition of a sample with x ϭ y ϭ 0.1.…”

Section: Introductionmentioning

confidence: 96%

“…The recently reported pressure dependence of T s is consistent with such a model. 4 The parent material of the alloy under investigation, orthorhombic BaCoS 2 , is regarded as a Mott insulator. 5,6 It has a Néel temperature, T N , very close to room temperature ͑RT͒.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetism, structural properties, and electronic transport ofBaCo0.9Ni0.1
Mentink
¹
,
Mason
²
,
Fisher³
et al. 1997
Phys. Rev. B
14
1
6
0
View full text Add to dashboard Cite

The layered transition-metal compound BaCo 0.9 Ni 0.1 S 1.8 is an antiferromagnetic insulator, T N ϭ 280 K, which undergoes a unique insulator to metal transition at T s ϭ 200 K. By x-ray and neutron powder diffraction we explore the difference in crystal structure above and below T s . The magnetic structure consists of Co moments of 1.8 Ϯ0.5 B with antiferromagnetic nearest-neighbor interactions. Below T s long-range order disappears. Resistivity and thermoelectric power measurements indicate that above T s this system is a narrowband material with dominating nearest-neighbor hopping. Magnetoresistance to 12 T shows insensitivity of T s to magnetic fields. The length changes at T s as measured by dilatometry are much larger than for ordinary first-order phase transitions. ͓S0163-1829͑97͒06118-3͔

show abstract

“…1) a situation close to an amorphous magnetic metal is indicated, the randomness probably arising from the sulfur deficit y. Note in this context that with y ¼ 0 no M-I transition is observed [14,15]. In the semiconducting state, we find magnetic order, which is lost at T N , connected with a magnetic peak in the specific heat capacity [11].…”

Section: Random Spin Statementioning

confidence: 64%

Anomalous Metal-Insulator Transition in BaCo1?xNixS2?y as a Triggered Phase Transition

Poddar

Kang

Bärner

et al. 2001

phys. stat. sol. (b)

View full text Add to dashboard Cite

Subject classification: 71.30.+h; 75.30.Kz; S8.16 The anomalous metal-insulator transition in BaCo 1--x Ni x S 2--y is identified as a triggered phase transition based on strong coupling between a magnetic and a structural order parameter. In particular, we observe a second-order paramagnetic-antiferromagnetic transition at T N followed by a first-order metal-insulator transition at T MI . The field-induced shifts of the sequential transition temperatures are determined for y ¼ 0.05: dT N /dB ¼ (--0.8 AE 0.2) K/T, and (--0.1 AE 0.1) K/T dT MI /dB (--0.5 AE 0.1) K/T.

show abstract

Influence of Hydrostatic Pressure on the Insulator-Metal Transition in BaCo0.9Ni0.1

Cited by 20 publications

References 4 publications

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Antiferromagnetism, structural properties, and electronic transport ofBaCo0.9Ni0.1
Mentink
¹
,
Mason
²
,
Fisher³
et al. 1997
Phys. Rev. B
14
1
6
0
View full text Add to dashboard Cite

Anomalous Metal-Insulator Transition in BaCo1?xNixS2?y as a Triggered Phase Transition

Contact Info

Product

Resources

About

Influence of Hydrostatic Pressure on the Insulator-Metal Transition in BaCo0.9Ni0.1

Cited by 20 publications

References 4 publications

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Novel Dynamical Effects and Glassy Response in a Strongly Correlated Electronic System

Antiferromagnetism, structural properties, and electronic transport ofBaCo0.9Ni0.1Mentink1, Mason2, Fisher3 et al. 1997Phys. Rev. B14160View full textAdd to dashboardCite

Anomalous Metal-Insulator Transition in BaCo1?xNixS2?y as a Triggered Phase Transition

Contact Info

Product

Resources

About

Antiferromagnetism, structural properties, and electronic transport ofBaCo0.9Ni0.1
Mentink
¹
,
Mason
²
,
Fisher³
et al. 1997
Phys. Rev. B
14
1
6
0
View full text Add to dashboard Cite