Structural characterization and magnetic properties of chromium jarosite KCr3(OD)6 (SO4)2
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Structural characterization and magnetic properties of chromium jarosite KCr3(OD)6 (SO4)2. / Janas, Sofie; Sorensen, Mathilde B.; Andersen, Anders B. A.; Juelsholt, Mikkel; Boehm, Martin; Pedersen, Kasper S.; Jensen, Kirsten M. O.; Lefmann, Kim; Nielsen, Ulla Gro.
In: Physical Chemistry Chemical Physics, Vol. 22, No. 43, 21.11.2020, p. 25001-25010.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Structural characterization and magnetic properties of chromium jarosite KCr3(OD)6 (SO4)2
AU - Janas, Sofie
AU - Sorensen, Mathilde B.
AU - Andersen, Anders B. A.
AU - Juelsholt, Mikkel
AU - Boehm, Martin
AU - Pedersen, Kasper S.
AU - Jensen, Kirsten M. O.
AU - Lefmann, Kim
AU - Nielsen, Ulla Gro
PY - 2020/11/21
Y1 - 2020/11/21
N2 - Potassium chromium jarosite, KCr3(OH)(6)(SO4)(2) (Cr-jarosite), is considered a promising candidate to display spin liquid behavior due to the strong magnetic frustration imposed by the crystal structure. However, the ground state magnetic properties have been debated, since Cr-jarosite is notoriously non-stoichiometric. Our study reports the magnetic properties for deuterated KCr3(OD)(6)(SO4)(2) on chemically well-defined samples, which have been characteried by a combination of powder X-ray diffraction, neutron diffraction, solid state NMR spectroscopy, and scanning electron microscopy with energy dispersive spectroscopy. Eight polycrystalline samples, which all contained only 1-3% Cr vacancies were obtained. However, significant substitution (2-27%) of potassium with H2O and/or H3O+ was observed and resulted in pronounced stacking disorder along the c-axis. A clear second-order transition to an antiferromagnetically ordered phase at T-N = 3.8(1) K with a small net moment of 0.03 mu(B) per Cr3+-ion was obtained from vibrating sample magnetometry and temperature dependent neutron diffraction. The moment is attributed to spin canting caused by the Dzyaloshinskii-Moriya interaction. Thus, our experimental results imply that even ideal potassium chromium jarosite will exhibit magnetic order below 4 K and therefore it does not qualify as a true spin liquid material.
AB - Potassium chromium jarosite, KCr3(OH)(6)(SO4)(2) (Cr-jarosite), is considered a promising candidate to display spin liquid behavior due to the strong magnetic frustration imposed by the crystal structure. However, the ground state magnetic properties have been debated, since Cr-jarosite is notoriously non-stoichiometric. Our study reports the magnetic properties for deuterated KCr3(OD)(6)(SO4)(2) on chemically well-defined samples, which have been characteried by a combination of powder X-ray diffraction, neutron diffraction, solid state NMR spectroscopy, and scanning electron microscopy with energy dispersive spectroscopy. Eight polycrystalline samples, which all contained only 1-3% Cr vacancies were obtained. However, significant substitution (2-27%) of potassium with H2O and/or H3O+ was observed and resulted in pronounced stacking disorder along the c-axis. A clear second-order transition to an antiferromagnetically ordered phase at T-N = 3.8(1) K with a small net moment of 0.03 mu(B) per Cr3+-ion was obtained from vibrating sample magnetometry and temperature dependent neutron diffraction. The moment is attributed to spin canting caused by the Dzyaloshinskii-Moriya interaction. Thus, our experimental results imply that even ideal potassium chromium jarosite will exhibit magnetic order below 4 K and therefore it does not qualify as a true spin liquid material.
KW - KAGOME
KW - PURE
KW - SPIN
KW - NA
KW - ANTIFERROMAGNETS
KW - ENVIRONMENTS
KW - DISORDER
KW - SERIES
KW - ORDER
KW - FE
U2 - 10.1039/d0cp04978f
DO - 10.1039/d0cp04978f
M3 - Journal article
C2 - 33112325
VL - 22
SP - 25001
EP - 25010
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 43
ER -
ID: 252105832