Hydrostatic pressure (8 GPa) dependence of electrical resistivity of BaCo2As2 single crystal

Ganguli, Chandreyee; Matsubayashi, Kazuyuki; Ohgushi, Kenya; Uwatoko, Yoshiya; Kanagaraj, M.; Arumugam, S.

doi:10.1016/j.materresbull.2013.07.003

Cited by 7 publications

(3 citation statements)

References 22 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike several other FeAs-based compounds, such as CaFe 2 As 2 , 35 38 we find that the room temperature resistivity of SrCo 2 As 2 increases with increasing pressure. Between approximately p = 2.0 GPa and 4.5 GPa we also observe a shallow upturn in the resistivity below T = 5 K which prevents analysis of the pressure dependence of the temperature coefficient of the resistivity.…”

Section: Electrical Resistance Measurements Under Applied Pressurecontrasting

confidence: 67%

Pressure-induced collapsed-tetragonal phase inSrCo2As2

et al. 2015

View full text Add to dashboard Cite

We present high-energy x-ray diffraction data under applied pressures up to p = 29 GPa, neutron diffraction measurements up to p = 1.1 GPa, and electrical resistance measurements up to p = 5.9 GPa, on SrCo2As2. Our x-ray diffraction data demonstrate that there is a first-order transition between the tetragonal (T) and collapsedtetragonal (cT) phases, with an onset above approximately 6 GPa at T = 7 K. The pressure for the onset of the cT phase and the range of coexistence between the T and cT phases appears to be nearly temperature independent. The compressibility along the a-axis is the same for the T and cT phases whereas, along the c-axis, the cT phase is significantly stiffer, which may be due to the formation of an As-As bond in the cT phase. Our resistivity measurements found no evidence of superconductivity in SrCo2As2 for p ≤ 5.9 GPa and T ≥ 1.8 K. The resistivity data also show signatures consistent with a pressure-induced phase transition for p 5.5 GPa. Singlecrystal neutron diffraction measurements performed up to 1.1 GPa in the T phase found no evidence of stripetype or A-type antiferromagnetic ordering down to 10 K. Spin-polarized total-energy calculations demonstrate that the cT phase is the stable phase at high pressure with a c a ratio of 2.54. Furthermore, these calculations indicate that the cT phase of SrCo2As2 should manifest either A-type antiferromagnetic or ferromagnetic order.

show abstract

Section: Electrical Resistance Measurements Under Applied Pressurecontrasting

confidence: 67%

Pressure-induced collapsed-tetragonal phase inSrCo2As2

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The proximity to a quantum-critical point is generally expected to be tuned by different perturbations such as chemical doping and/or external pressure. A high-pressure study revealed that the substantial electron correlations in BaCo 2 As 2 are reduced with increasing pressure up to 8 GPa [53], with no evidence for magnetic ordering. A small amount of K doping on the Ba site with composition Ba 0.94 K 0.06 Co 2 As 2 results in weak ferromagnetism at T 10 K with ordered moments of 0.007 and 0.03 μ B /f.u.…”

Section: Introductionmentioning

confidence: 99%

Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co_{1−
x}Ir_x)₂As₂ (0 ⩽ x ⩽ 0.25)

Pakhira¹,

Sangeetha²,

Smetana³

et al. 2020

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The ternary-arsenide compound BaCo2As2 was previously proposed to be in proximity to a quantum-critical point where long-range ferromagnetic (FM) order is suppressed by quantum fluctuations. Here we report the effect of Ir substitutions for Co on the magnetic and thermal properties of Ba ( C o 1 − x I r x ) 2 A s 2 (0 ⩽ x ⩽ 0.25) single crystals. These compositions all crystallize in an uncollapsed body-centered-tetragonal ThCr2Si2 structure with space group I4/mmm. Magnetic susceptibility measurements reveal clear signatures of short-range FM ordering for x ⩾ 0.11 below a nearly composition-independent characteristic temperature T cl ≈ 13 K. The small variation of T cl with x, thermomagnetic irreversibility between zero-field-cooled and field-cooled magnetic susceptibility versus T, the occurrence of hysteresis in magnetization versus field isotherms at low field and temperature, and very small spontaneous and remanent magnetizations <0.01 μ B/f.u. together indicate that the FM response arises from short-range FM ordering of FM spin clusters as previously inferred to occur in Ca(Co1−x Ir x )2−y As2. Heat-capacity C p(T) data do not exhibit any clear feature around T cl, consistent with the very small moments of the FM clusters. The C p(T) in the paramagnetic temperature regime 25–300 K is well described by the sum of a Sommerfeld electronic contribution and Debye and Einstein lattice contributions where the latter lattice contribution suggests the presence of low-frequency optic modes associated with the heavy Ba atoms in the crystals.

show abstract

“…The proximity to a quantum-critical point is generally expected to be able to be tuned by different perturbations such as chemical doping and/or external pressure. A high-pressure study revealed that the substantial electron correlations in BaCo 2 As 2 are reduced with increasing pressure up to 8 GPa [53], with no evidence for magnetic ordering. A small amount of K doping on the Ba site with composition Ba 0.94 K 0.06 Co 2 As 2 results in weak ferromagnetism at T 10 K with ordered moments of 0.007 and 0.03 µ B /f.u.…”

Section: Introductionmentioning

confidence: 99%

Emergence of ferromagnetism due to Ir substitutions in single-crystalline Ba[Co(1 x)Ir(x)]2As2

Pakhira,

Sangeetha,

Smetana

et al. 2020

Preprint

View full text Add to dashboard Cite

The ternary-arsenide compound BaCo2As2 was previously proposed to be in proximity to a quantum-critical point where long-range ferromagnetic (FM) order is suppressed by quantum fluctuations. Here we report the effect of Ir substitution for Co on the magnetic and thermal properties of Ba(Co1−xIrx)2As2 (0 ≤ x ≤ 0.25) single crystals. These compositions all crystallize in an uncollapsed body-centered-tetragonal ThCr2Si2 structure with space group I4/mmm. Magnetic susceptibility χ measurements reveal clear signatures of FM ordering for x ≥ 0.11 with a nearly composition-independent Curie temperature TC ≈ 13 K. The small variation of TC with x, the occurrence of hysteresis in magnetization versus field isotherms at low field and temperature, very small spontaneous and remanent magnetizations < 0.01 µB/f.u., and thermomagnetic irreversibility in the low-temperature region together indicate that the FM response arises from short-range FM ordering of spin clusters as previously inferred to occur in Ca(Co1−xIrx)2−yAs2. Heat-capacity Cp(T ) data do not exhibit any clear feature around TC, further indicating that the FM ordering is short-range and/or associated with itinerant moments. The Cp(T ) in the paramagnetic temperature regime 25-300 K is well described by the sum of a Sommerfeld electronic contribution and Debye and Einstein lattice contributions where the latter suggests the occurrence of low-frequency optic modes associated with the heavy Ba atoms in the crystals.

show abstract

Hydrostatic pressure (8 GPa) dependence of electrical resistivity of BaCo2As2 single crystal

Cited by 7 publications

References 22 publications

Pressure-induced collapsed-tetragonal phase inSrCo2As2

Pressure-induced collapsed-tetragonal phase inSrCo2As2

Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co_{1−
x}Ir_x)₂As₂ (0 ⩽ x ⩽ 0.25)

Emergence of ferromagnetism due to Ir substitutions in single-crystalline Ba[Co(1 x)Ir(x)]2As2

Contact Info

Product

Resources

About

Hydrostatic pressure (8 GPa) dependence of electrical resistivity of BaCo2As2 single crystal

Cited by 7 publications

References 22 publications

Pressure-induced collapsed-tetragonal phase inSrCo2As2

Pressure-induced collapsed-tetragonal phase inSrCo2As2

Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co1− x Ir x )2As2 (0 ⩽ x ⩽ 0.25)

Emergence of ferromagnetism due to Ir substitutions in single-crystalline Ba[Co(1 x)Ir(x)]2As2

Contact Info

Product

Resources

About

Short-range ferromagnetic order due to Ir substitutions in single-crystalline Ba(Co_{1−
x}Ir_x)₂As₂ (0 ⩽ x ⩽ 0.25)