Magnetic fluctuations in Pb$_9$Cu(PO$_4$)$_6$O

Harald O. Jeschke; Junya Otsuki; Makoto Shimizu

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Magnetic fluctuations in Pb$_9$Cu(PO$_4$)$_6$O

Makoto Shimizu, Junya Otsuki, Harald O. Jeschke

Strongly Correlated Electrons · Submitted 24 Aug 2023

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Only slight charge doping switches between antiferromagnetic and ferromagnetic fluctuations.

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.17 · human participants 0.02 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.16 · compares with prior results 0.44 · mentions code or data availability 0.02.

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The hope that copper doped lead apatite Pb$_9$Cu(PO$_4$)$_6$O is a room-temperature superconductor has largely been dashed by global research efforts. Nevertheless, according to the current state of knowledge, the material has interesting magnetic properties, and research groups around the world have prepared high quality samples. We use a fluctuation exchange approximation (FLEX) approach to study the magnetic tendencies in Pb$_9$Cu(PO$_4$)$_6$O. We find ferromagnetic fluctuations very close to the filling of the stoichiometric compound which can be understood from Fermi surface nesting at the M point. This is similar to the one-band triangular lattice Hamiltonian at three-quarter filling. Interestingly, the special kz dependence of the Pb$_9$Cu(PO$_4$)$_6$O band structure makes it very sensitive to doping. Only slight charge doping switches between antiferromagnetic and ferromagnetic fluctuations. If the material could become superconducting, it might be easily switchable between singlet and triplet superconductivity.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	The hope that copper doped lead apatite Pb$_9$Cu(PO$_4$)$_6$O is a room-temperature superconductor has largely been dashed by global research efforts.	background 1.00	0.04	0.04	asserted 0.95
s1	Nevertheless, according to the current state of knowledge, the material has interesting magnetic properties, and research groups around the world have prepared high quality samples.	background 1.00	0.04	0.02	asserted 0.92
s2	We use a fluctuation exchange approximation (FLEX) approach to study the magnetic tendencies in Pb$_9$Cu(PO$_4$)$_6$O.	method 0.86	0.95	0.03	asserted 0.96
s3	We find ferromagnetic fluctuations very close to the filling of the stoichiometric compound which can be understood from Fermi surface nesting at the M point.	result 1.00	0.96	0.53	asserted 1.00
s4	This is similar to the one-band triangular lattice Hamiltonian at three-quarter filling.	interpretation 0.91	0.48	0.07	asserted 0.99
s5	Interestingly, the special kz dependence of the Pb$_9$Cu(PO$_4$)$_6$O band structure makes it very sensitive to doping.	result 0.80	0.70	0.07	asserted 1.00
s6	Only slight charge doping switches between antiferromagnetic and ferromagnetic fluctuations.	result 0.99	0.84	0.28	asserted 1.00
s7	If the material could become superconducting, it might be easily switchable between singlet and triplet superconductivity.	interpretation 0.98	0.21	0.10	speculative 0.91

What kind of paper the classifier reports this is: simulation study 0.80 · evidence from simulation or computation 1.00.

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Original abstract

The hope that copper doped lead apatite Pb$_9$Cu(PO$_4$)$_6$O is a room-temperature superconductor has largely been dashed by global research efforts. Nevertheless, according to the current state of knowledge, the material has interesting magnetic properties, and research groups around the world have prepared high quality samples. We use a fluctuation exchange approximation (FLEX) approach to study the magnetic tendencies in Pb$_9$Cu(PO$_4$)$_6$O. We find ferromagnetic fluctuations very close to the filling of the stoichiometric compound which can be understood from Fermi surface nesting at the M point. This is similar to the one-band triangular lattice Hamiltonian at three-quarter filling. Interestingly, the special kz dependence of the Pb$_9$Cu(PO$_4$)$_6$O band structure makes it very sensitive to doping. Only slight charge doping switches between antiferromagnetic and ferromagnetic fluctuations. If the material could become superconducting, it might be easily switchable between singlet and triplet superconductivity.

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Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

What it cites · 26 sentences without a confident label

Uses data or values from 1 paper

As DFT structure prediction has well known issues for correlated oxides, we use experimental [ref] rather than DFT predicted lattice parameters.

The First Room-Temperature Ambient-Pressure Superconductor · Electronic structure · 0.96

Compares with 2 papers

It is similar to the structures considered in other works [ref] .

Electronic structure of the putative room-temperature superconductor Pb$_9$Cu(PO$_4$)$_6$O · Electronic structure · 0.95
It is similar to the structures considered in other works [ref] .

Pb$_9$Cu(PO4)$_6$(OH)$_2$: Phonon bands, Localized Flat Band Magnetism, Models, and Chemical Analysis · Electronic structure · 0.95

Cites as background 11 papers

Superconductivity has been theoretically studied using the two-dimensional $t$-$J$ model [ref] and spin fluctuation theory [ref] .

No superconductivity in Pb$_9$Cu$_1$(PO$_4$)$_6$O found in orbital and spin fluctuation exchange calculations · Introduction · 0.88
Superconductivity has been theoretically studied using the two-dimensional $t$-$J$ model [ref] and spin fluctuation theory [ref] .

S-wave pairing in a two-orbital t-J model on triangular lattice: possible application to Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O · Introduction · 0.88
Copper doped lead apatite has recently been put forward as a candidate for room temperature superconductivity at ambient pressure [ref] , causing substantial excitement in the scientific community.

The First Room-Temperature Ambient-Pressure Superconductor · Introduction · 0.92

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