TY - JOUR
T1 - Common effect of chemical and external pressures on the magnetic properties of R CoPO (R= La, Pr, Nd, Sm).
AU - Prando, G.
AU - Profeta, G.
AU - Continenza, A.
AU - Khasanov, R.
AU - Pal, A.
AU - Awana, V. P.S.
AU - Büchner, B.
AU - Sanna, S.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/10/12
Y1 - 2015/10/12
N2 - We investigate the direct correspondence between Co band ferromagnetism and structural parameters in the pnictide oxides RCoPO for different rare-earth ions (R=La,Pr,Nd,Sm) by means of muon-spin spectroscopy and ab initio calculations, complementing our results published previously [G. Prando et al., Common effect of chemical and external pressures on the magnetic properties of RCoPO (R=La,Pr), Phys. Rev. B 87, 064401 (2013)PRBMDO1098-012110.1103/PhysRevB.87.064401]. We find that both the transition temperature to the ferromagnetic phase TC and the volume of the crystallographic unit cell V are conveniently tuned by the R ionic radius and/or external pressure. We report a linear correlation between TC and V and our ab initio calculations unambiguously demonstrate a full equivalence of chemical and external pressures. As such, we show that R ions influence the ferromagnetic phase only via the induced structural shrinkage without involving any active role from the electronic f degrees of freedom, which are only giving a sizable magnetic contribution at much lower temperatures.
AB - We investigate the direct correspondence between Co band ferromagnetism and structural parameters in the pnictide oxides RCoPO for different rare-earth ions (R=La,Pr,Nd,Sm) by means of muon-spin spectroscopy and ab initio calculations, complementing our results published previously [G. Prando et al., Common effect of chemical and external pressures on the magnetic properties of RCoPO (R=La,Pr), Phys. Rev. B 87, 064401 (2013)PRBMDO1098-012110.1103/PhysRevB.87.064401]. We find that both the transition temperature to the ferromagnetic phase TC and the volume of the crystallographic unit cell V are conveniently tuned by the R ionic radius and/or external pressure. We report a linear correlation between TC and V and our ab initio calculations unambiguously demonstrate a full equivalence of chemical and external pressures. As such, we show that R ions influence the ferromagnetic phase only via the induced structural shrinkage without involving any active role from the electronic f degrees of freedom, which are only giving a sizable magnetic contribution at much lower temperatures.
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U2 - 10.1103/PhysRevB.92.144414
DO - 10.1103/PhysRevB.92.144414
M3 - Article
AN - SCOPUS:84944809830
SN - 1098-0121
VL - 92
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 14
M1 - 144414
ER -