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Title: Combined effects of Sr substitution and pressure on the ground states in CaFe 2 As 2

Abstract

Here, we present a detailed study of the combined effects of Sr substitution and hydrostatic pressure on the ground-state properties of CaFe2As2. Measurements of the electrical resistance and magnetic susceptibility, both at ambient and finite pressure P ≤ 2 GPa, were performed on Ca1–xSrxFe2As2 single crystals grown out of Sn flux. We find that by Sr substitution the transition temperature to the magnetic/structural phase is enhanced and therefore a higher pressure is needed to suppress the transition to lowest temperature. In addition, the transition to the collapsed tetragonal phase is found at a pressure, which is distinctly higher than in the pure compound. This implies that the stability ranges of both phases shift on the pressure-axis upon doping, but the latter one with a higher rate. These observations suggest the possibility of separating the two phase lines, which intersect already at elevated temperatures for x = 0 and low Sr concentration levels. For x = 0.177, we find strong evidence that both phases remain separated down to the lowest temperature and that a zero-resistance state emerges in this intermediate pressure window. This observation indicates that Sr substitution combined with hydrostatic pressure provides another route for stabilizing superconductivity in CaFe2As2. Lastly,more » our results are consistent with the notion that (i) preserving the fluctuations associated with the structural-magnetic transition to low temperatures is vital for superconductivity to form in this material and that (ii) the nonmagnetic collapsed tetragonal phase is detrimental for superconductivity.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [1]
  1. J.W. Goethe-Univ. Frankfurt(M), Frankfurt(M) (Germany)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. of California, San Diego, CA (United States)
  3. San Diego State Univ., San Diego, CA (United States)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1335025
Alternate Identifier(s):
OSTI ID: 1329508
Report Number(s):
IS-J-9130
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Knoner, S., Gati, E., Kohler, S., Wolf, B., Tutsch, U., Ran, S., Torikachvili, M. S., Bud'ko, S. L., Canfield, P. C., and Lang, M. Combined effects of Sr substitution and pressure on the ground states in CaFe2As2. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.144513.
Knoner, S., Gati, E., Kohler, S., Wolf, B., Tutsch, U., Ran, S., Torikachvili, M. S., Bud'ko, S. L., Canfield, P. C., & Lang, M. Combined effects of Sr substitution and pressure on the ground states in CaFe2As2. United States. https://doi.org/10.1103/PhysRevB.94.144513
Knoner, S., Gati, E., Kohler, S., Wolf, B., Tutsch, U., Ran, S., Torikachvili, M. S., Bud'ko, S. L., Canfield, P. C., and Lang, M. Fri . "Combined effects of Sr substitution and pressure on the ground states in CaFe2As2". United States. https://doi.org/10.1103/PhysRevB.94.144513. https://www.osti.gov/servlets/purl/1335025.
@article{osti_1335025,
title = {Combined effects of Sr substitution and pressure on the ground states in CaFe2As2},
author = {Knoner, S. and Gati, E. and Kohler, S. and Wolf, B. and Tutsch, U. and Ran, S. and Torikachvili, M. S. and Bud'ko, S. L. and Canfield, P. C. and Lang, M.},
abstractNote = {Here, we present a detailed study of the combined effects of Sr substitution and hydrostatic pressure on the ground-state properties of CaFe2As2. Measurements of the electrical resistance and magnetic susceptibility, both at ambient and finite pressure P ≤ 2 GPa, were performed on Ca1–xSrxFe2As2 single crystals grown out of Sn flux. We find that by Sr substitution the transition temperature to the magnetic/structural phase is enhanced and therefore a higher pressure is needed to suppress the transition to lowest temperature. In addition, the transition to the collapsed tetragonal phase is found at a pressure, which is distinctly higher than in the pure compound. This implies that the stability ranges of both phases shift on the pressure-axis upon doping, but the latter one with a higher rate. These observations suggest the possibility of separating the two phase lines, which intersect already at elevated temperatures for x = 0 and low Sr concentration levels. For x = 0.177, we find strong evidence that both phases remain separated down to the lowest temperature and that a zero-resistance state emerges in this intermediate pressure window. This observation indicates that Sr substitution combined with hydrostatic pressure provides another route for stabilizing superconductivity in CaFe2As2. Lastly, our results are consistent with the notion that (i) preserving the fluctuations associated with the structural-magnetic transition to low temperatures is vital for superconductivity to form in this material and that (ii) the nonmagnetic collapsed tetragonal phase is detrimental for superconductivity.},
doi = {10.1103/PhysRevB.94.144513},
journal = {Physical Review B},
number = 14,
volume = 94,
place = {United States},
year = {Fri Oct 21 00:00:00 EDT 2016},
month = {Fri Oct 21 00:00:00 EDT 2016}
}

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Works referenced in this record:

First-order structural phase transition in CaFe 2 As 2
journal, July 2008


Pressure Induced Superconductivity in CaFe 2 As 2
journal, July 2008


Lattice and magnetic instabilities in CaFe 2 As 2 : A single-crystal neutron diffraction study
journal, September 2008


Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
journal, May 2009


Hydrostatic-pressure tuning of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe 1 x Co x ) 2 As 2
journal, December 2012


Giant Plasticity of a Quantum Crystal
journal, January 2013


Evolution of bulk superconductivity in SrFe 2 As 2 with Ni substitution
journal, June 2009


High-temperature solution growth of intermetallic single crystals and quasicrystals
journal, May 2001


Pressure-induced volume-collapsed tetragonal phase of CaFe 2 As 2 as seen via neutron scattering
journal, November 2008


Structural collapse and superconductivity in rare-earth-doped CaFe 2 As 2
journal, January 2012


Tuning magnetism in FeAs-based materials via a tetrahedral structure
journal, August 2012


Phase transition and superconductivity of SrFe 2 As 2 under high pressure
journal, March 2011

  • Uhoya, Walter O.; Montgomery, Jeffrey M.; Tsoi, Georgiy M.
  • Journal of Physics: Condensed Matter, Vol. 23, Issue 12
  • DOI: 10.1088/0953-8984/23/12/122201

Complete pressure-dependent phase diagrams for SrFe 2 As 2 and BaFe 2 As 2
journal, June 2009


Pressure-induced superconductivity in CaFe 2 As 2
journal, July 2008


Effects of Pressure on the Superconducting Transition Temperatures of Sn, In, Ta, Tl, and Hg
journal, October 1958


Structural transition and anisotropic properties of single-crystalline SrFe 2 As 2
journal, July 2008


Absence of superconductivity in single-phase CaFe 2 As 2 under hydrostatic pressure
journal, January 2009


Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of CaFe 2 As 2 under uniaxial pressure
journal, May 2010


Growth of single crystals from metallic fluxes
journal, June 1992


High pressure study of BaFe 2 As 2 —the role of hydrostaticity and uniaxial stress
journal, January 2010


Uniform chemical pressure effect in solid solutions Ba 1 -x Sr x Fe 2 As 2 and Sr 1 −x Ca x Fe 2 As 2
journal, January 2011


Making and Breaking Bonds in the Solid State: The ThCr 2 Si 2 Structure
journal, September 1985

  • Hoffmann, Roald; Zheng, Chong
  • The Journal of Physical Chemistry, Vol. 89, Issue 20
  • DOI: 10.1021/j100266a007

Symmetry-preserving lattice collapse in tetragonal SrFe 2 x Ru x As 2 ( x = 0 , 0.2 ): A combined experimental and theoretical study
journal, August 2011


Solidification of helium at 77°K
journal, October 1961


Control of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe 1 x Co x ) 2 As 2
journal, June 2012


Upper critical field of K Fe 2 As 2 under pressure: A test for the change in the superconducting gap structure
journal, June 2014


Lattice collapse and quenching of magnetism in CaFe 2 As 2 under pressure: A single-crystal neutron and x-ray diffraction investigation
journal, January 2009


Sensitive Pressure Gauge on the Basis of Pure n-InSb
journal, October 1984


Pressure-induced superconducting state of antiferromagnetic CaFe 2 As 2
journal, July 2009


Works referencing / citing this record:

Evolution of the magnetic order of Fe and Eu sublattices in Eu 1− x Ca x Fe 2 As 2 (0 ⩽ x ⩽ 1) single crystals
journal, September 2018

  • Harnagea, Luminita; Kumar, Rohit; Singh, Surjeet
  • Journal of Physics: Condensed Matter, Vol. 30, Issue 41
  • DOI: 10.1088/1361-648x/aadea6